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PAC SNI-1/3.5 Noise Filter

Helps eliminate ground loop noise from your portable music player! (3.5mm plugs)

Item # 127SNI135

Problem: You plug your portable music player into the aux input on your car's receiver, but there's an annoying...

Problem: You plug your portable music player into the aux input on your car's receiver, but there's an annoying...

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Item # 127SNI135

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$11.99
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About the PAC SNI-1/3.5 Noise Filter

Problem: You plug your portable music player into the aux input on your car's receiver, but there's an annoying whine along with the music.

Problem: You plug your portable music player into the aux input on your car's receiver, but there's an annoying whine along with the music.

Solution: PAC's SNI-1/3.5 preamp noise filter plugs in between your receiver's auxiliary input and your portable music player to help reduce noise caused by a ground loop. The filter includes a female 3.5mm input, a male 3.5mm output, and 10 inches of cable for each jack. Warranty: 30 days.

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What's in the box:

  • Noise filter with attached 10" input cable (terminated with female 3.5mm minijack) and 10" output cable (terminated with 3.5mm male minijack)
MFR #SNI-1/3.5

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PAC SNI-1/3.5 Noise Filter reviews

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PAC SNI-1/3.5 Noise Filter

Crutchfield customer from Orange City, FL on 7/10/2019

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I installed this between JBL Bluetooth and radio mic. Imput no longer hear car motor noise thru speakers

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0 of 0 found this helpful

Worth the investment!

Crutchfield customer from Madison, AL on 5/20/2019

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Good product to own. It does it's job to provide clear cut sound and quality when listening???? to music ??. I have no complaints

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0 of 0 found this helpful

Simple, inexpensive and it works!

Michael from North Potomac, MD on 2/16/2019

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I was getting odd, scratchy noise from my iPhone connected to the aux port on my Prius, but only when the iPhone was also connected to power from the "cigarette lighter" jack. This product eliminated the noise without degrading the sound. It's great when a simple, inexpensive solution works this well! Installation is trivial.

Pros: Eliminates the noise. Easy to install.

Cons: None.

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0 of 0 found this helpful

0 noise after installation

Michael A from Selden, NY on 7/1/2018

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Worked perfect! The humming through my video input (2005 STS) was driving me nuts. Installed this in like and silence; tanks for recommending it!

Pros: Great price, works perfect

Cons: None

Crutchfield response on

1 of 1 found this helpful

Works perfectly !

Michael from Brunswick, GA on 6/25/2018

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Works perfectly. Very well made and solid. Much better than my first attempt that had to be returned. Then I wised up and came to Crutchfield.

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1 of 1 found this helpful

Saved My Podcast

Crutchfield customer from Newburgh, NY on 2/26/2018

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I produce a podcast and use 2 computers and a mixer to record the show. Long story short, i had a ground loop that generated so much background noise it was pointless to use the mixer. I bought 4 of the PAC SNI 1/3.5, one for each line and the difference was amazing! I hear a huge difference and so does my audience. Worth every penny!

Pros: Works as expected

Cons: None from me

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0 of 0 found this helpful

PAC SNI-1/3.5 Noise Filter

Mike from Albuquerque, NM on 12/30/2017

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This filter removed the ignition noise that was being picked up by my satellite radio in my truck. I am very happy with results.

Pros: Very easy to install.

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0 of 0 found this helpful

PAC SNI-1/3.5

Shannon from Independence, MO on 6/12/2017

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This filter is the best if you have alternator whine. When using the headphone jack and charging at the same time, this eliminated that annoying WEEEEEEEEEE. For the cost it is worth trying before rewiring your system like I did. Give it a try and save yourself the headaches I did before you rewire.

Pros: Small enough it fits anywhere

Cons: But longer wiring of unit would be nice so I could hide it.

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0 of 0 found this helpful

PAC SNI-1/3.5 Noise Filter

Crutchfield customer from Liberty, MO on 5/18/2017

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This noise filter did not help my problem at all. I actually made it much worse. Not only was I still able to hear all of the noises that had been there before adding the filter, but now the music volume and sound were like going from stereo to mono. Waste of time and money. The only reason there is 1 star is because the rating could not be submitted with 0.

Pros: None.

Cons: Added worse distortion.

Crutchfield response on 5/22/2017
We're sorry you're having problems with your noise filter. Whenever you encounter a problem with anything you purchase from Crutchfield, please contact our tech support team right away. They can help you solve the problem or set up a return within 60 days of purchase. We forwarded this review to our Technical Support team for follow-up. Lifetime tech support comes with every Crutchfield purchase.

0 of 1 found this helpful

Marked improvement

Jack from Austin, TX on 3/19/2017

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Helped reduce alternator whine, did not entirely eliminate (2001 Accord with aux adapter plugged into CD changer socket on factory radio) Definitely worth its cost.

Pros: Easy to connect

Cons: none

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0 of 0 found this helpful

PAC SNI-1/3.5 Noise Filter

Crutchfield customer from Addison, IL on 3/15/2017

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It works perfectly no more noise in my bluetooth system

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0 of 0 found this helpful

PAC SNI-1/3.5 Noise Filter

Crutchfield customer from Chicago, IL on 2/19/2017

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My iPhone, when connected to my car's aux input 3.5mm jack, was exhibiting loud buzzing when charging along with my car charger. I was skeptical of this device, since it doesn't have a third connection for a grounding cable. However, it reduced the buzzing to almost zero. I'm glad I took the risk with this device and it returned my car to clean-sounding-audio.

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0 of 0 found this helpful

PAC SNI-1/3.5 Noise Filter

Crutchfield customer from Bakersfield, CA on 1/29/2017

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Does just what they say it will do.

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0 of 0 found this helpful

PAC SNI-1/3.5 Noise Filter

Crutchfield customer from STRATFORD ,CT on 11/21/2016

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IT WAS EXACTLY WHAT I NEEDED.

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0 of 0 found this helpful

PAC SNI-1/3.5 Noise Filter

Sean from New York on 6/5/2016

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Purchase to prevent engine RPM noise through radio deck due to ground loop from my Sirius Radio worked perfect

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0 of 0 found this helpful

Ground loop filter

Douglas from Glendora, ca. on 1/26/2016

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Had a buz noise when using a head phone jack from a 29" 120v tv through my alpine head unit with two alpine amps. No noise on any of the other sources but as soon as you select aux (tv) you get the buz noise. This filter reduced the noise to almost nothing.

Pros: Does what it's supposed to do.

Cons: None.

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1 of 1 found this helpful

PAC SNI-1/3.5 Noise Filter

Crutchfield customer from Michigan on 7/13/2015

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Removed alternator whine 100% from Garmin XM radio on my Goldwing.

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2 of 2 found this helpful

Did Its Job

Jeremiah S. from Arkansas on 3/16/2015

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In a word.....Simple. Plug it up and allow the silence to wash over you. I've used several and they have all been amazing.

Pros: Simple

Cons: None

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0 of 0 found this helpful

Excellent

Satisfied Customer from Chicago on 2/12/2015

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Worked perfectly!!!

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0 of 0 found this helpful

Good Product

Will from Chicago, IL on 1/26/2015

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This device did exactly what I needed it to do. I installed an Audiovox Mediabridge in my 2006 Honda Accord. When I hooked up my external Sirius XM radio to the auxiliary jack on the Mediabridge, it would produce a whining/hissing noise, due to a bad ground wire. The noise was very annoying and made listening to made satellite radio unbearable. Once I hooked up this device the noise was gone. Occasionally, the audio will go in and out, which might just be due to a bad auxiliary cord on my end. Would personally recommend this product.

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0 of 0 found this helpful

Alternator noise

Superdog from Lake City AR on 9/4/2014

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It works an does a great job at it best filter I have ever had good investment if you got a ground noise

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0 of 0 found this helpful

Works great

David from Prosper, TX on 12/24/2013

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Does what it says.

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0 of 0 found this helpful

Works Great

Jim from Maryland on 9/17/2013

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Perfect solution to an annoying problem.

Pros: Eliminates ground loop noise when listening to your phone or ipod when the source is also connected to a charger.

Cons: Product is not waterproof. I use it on my motorcycle.

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1 of 1 found this helpful

Worked perfect

Mike S from Tomahawk, wi on 8/11/2013

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I had a terrible noise on the boat radio when I played the iPod and charged it at the same time. I put in the noise filter and everything works fine.

Pros: Worked perfect

Cons: None

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0 of 1 found this helpful

eeeeeeeeeeeeeeeeeeeeeeeeeeeeeee

cj from Antioch,CA on 7/11/2013

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Did the trick. Eliminated whine

Pros: Works Great

Cons: Should have gotten sooner

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0 of 0 found this helpful

Like everyone says it works seriously!

DjB from Aurora, Illinois on 11/20/2012

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This really works and its inexpensive. What a great solution!

Pros: It works really well

Cons: None

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0 of 1 found this helpful

IT WORKS

AJ from NJ on 10/4/2012

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For those of you who are running a portable device (for me it's my Sirius S50 radio) and getting crazy interference from the car, such as accelerating the gas pedal or power windows, this noise filter does work. I was doubtful at first, but I took a chance and ordered the unit. Got the unit in the mail and hooked it up in 2 seconds and BAM. No more background whining noise. The only thing that I think it might also affect is the sound. It appears it makes the sound not as rich as the sound was meant to be. Seems to have a tad bit more treble, but not enough to not get this unit

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1 of 1 found this helpful

PACSNI

ted from albany ny on 5/1/2012

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does that it says it will to. Killed the alternator wine in my 66 Mustang when using my Ipod

Pros: it works

Cons: none

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0 of 0 found this helpful

Peace at last

chuckt from Holly, Mi on 2/22/2012

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I admit my hearing isn't the best, and to be honest the hum that this eliminates didn't bother me that much. My wife, on the other hand, has great hearing and I could never use my xm radio with her in the car. The high pitched hum would literally give her a headache. After about 20 minutes I would have to turn the radio off. As soon as I plugged this in she said she couldn't hear the hum at all. Now I have peace at last.

Pros: Eliminates that annoying high pitched hum when your radio is plugged into the power socket.

Cons: My only complaint is the cords aren't really long enough to tuck the module away and out of sight.

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BUY ONE!!!!

Toyota Man from MA on 11/9/2011

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I have tried just about everything. This is the only thing that really works. NO MORE HUM!!! PRICELESS!!

Pros: small, compact and a great price. this thing really works. 10 stars in my book. no more hum. buy it

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WORKS RIGHT THE FIRST TIME!

Ray from New York, New York on 11/3/2011

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This was so easy to install in my Lexus IS250's aux input. Whenever I had my iPhone hooked up to both my car's aux input for music and the cigarette lighter for power, I got this annoying alternator whine. This PAC SNI-1/3.5 Noise Filter solved the problem instantly! Many thanks, Crutchfield, for letting me know this product even existed!

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1 of 1 found this helpful

No effect on audio feedback

KeithN from Columbus,OH on 11/3/2011

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Sounds like a great idea, but it didn't work. I'm getting feedback in my 2010 Mazda 3 when I have my iPhone charging and plugged into the aux at the same time. This product did nothing to reduce the feedback.

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4 of 5 found this helpful

Poorly made, cheaply produced

BWsquare from Los Angeles, CA on 8/13/2011

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Can they not make these things right, ever? This is the second piece of car audio equipment I've bought in the past few days that is broken. Loose wire causing crackle and shorting. Poorly manufactured. Lame.

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1 of 4 found this helpful

Got rid of the hum

DL from Chicago on 6/21/2011

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Whenever I listened to my mp3's while driving, I would get this annoying hum if a) the phone was plugged into the Aux port AND b) the phone was connected to the car charger. The hum disappeared if i disconnected the car charger. This was fine for short trips, but not for longer road trips. I heard a ground loop isolator would solve the problem. Plugged it in and voila, no more hum.

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1 of 1 found this helpful

great simple solution

bdmcfarland7 from Centerville, OH on 2/20/2011

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This worked great for me. I run my Sirius satellite radio directly into an auxiliary input adapter in my car to avoid using the FM transmitter. I had a constant buzzing/whining sound coming through the speakers, and this device completely got rid of it. It was a no hassle install and well worth the money. Consider me a satisfied customer.

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3 of 3 found this helpful

Bad Sound quality

Tan from Atlanta, GA on 10/14/2010

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I purchased this product because it got such high rating. However, I was disappointed in the sound quality. It does eliminate the engine whining noise. It also eliminated the low and high frequency from the music. In that respect, if you only use this for talking on the phone then this product works just fine for you. However, if you want to listen to the music from your phone, the music may not sound very good. I found out the hard way that the solution is much easier then you think. When this product didn't work as good as I wanted, I then look for alternative. All I have to do was to make sure the negative wire to the cigarette lighter is properly grounded.

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6 of 6 found this helpful

Works like a charm!

Brice from Monroe, MI on 6/16/2010

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I use my iPod Touch as the user interface for my XM radio along with the dock that connects the antenna and powers the iPod, etc. The fm transmitter of the dock is not very effective, so I used a separate, much better transmitter. However, when I connected the two, the ground loop was obnoxious. After taking less than a minute to plug in this noise filter, the ground loop was gone, and my sound is impeccable once more!

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1 of 1 found this helpful

Excellent product, excellent service.

Alberto from Miami, FL. on 6/8/2010

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Bought it for my Mazda 3 and worked great. Guys at customer service were very helpful making my payment with international credit card. Thanks a lot.

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2 of 2 found this helpful

Worked as advertised

Terrance from Dearborn, MI on 4/23/2010

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Golly, what a difference! Instead of the insanity created by constant alternator whine, I now have a clean signal. With regard to those that say they lose some fidelity, I didn't really notice any loss. The signal was so bad anyway, how would you be able to tell? Thank you Crutchfield. Good service and speedy delivery.

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0 of 0 found this helpful

Excellent Product and Service

David from Ottawa, CA on 12/8/2009

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This filter does exactly what it is supposed to. All the noise when using the AUX IN, that I've suffered for the past 3 years, has now gone. Period. Service buying thru the Canadian Web site was excellent: ordered Sun Dec 6 @10 am; delivered the morning of Tues Dec 8. An Excellent company to buy from.

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2 of 2 found this helpful

Negatively affects sound quality

Scott from San Diego, CA on 11/23/2009

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I purchased this filter to eliminate background hissing noise caused by a ground loop when connecting my iPod to the DC power jack of a 2006 Prius. It got great reviews, so I was surprised and disappointed to find that it negatively affects the sound quality of my system. This is most noticeable at higher volumes and at certain bass frequencies; however it is also noticeable at any volume whenever the sound becomes very full. This seems to overload the circuitry and produce crackly noises (similar to blown or overdriven speakers). Furthermore, I've noticed that music generally sounds less pure even when this particular distortion is not evident (I've unplugged and replugged several times to make sure that this isn't simply in my head.). I'm a discerning listener, so both of these issues are annoying. So, in summary, although this product eliminated my ground loop problem, it introduced other annoying problems. As a result, I unfortunately can't recommend it.

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10 of 13 found this helpful

Works as advertised

Chuck from Moore, OK on 10/27/2009

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Used on my Peterbilt truck. Works perfect. I first tried a new audio cable with no luck, and was almost ready to completely rewire everything when I came across this cable. I have no complaints. If you have a noise problem, buy this!

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Wow. It just plain works.

John M from Arlington, Va. on 9/24/2009

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I had real bad alternator whine when I ran my Sirius through the 3.5mm jack of an AudioLink adapter that goes into the CD changer port of my '07 Miata's Bose HU. I'm usually worried about passive filters and what they can do to audio quality but this little box totally wipes out the whine AND leaves the signal unchanged IMO. In fact there's a touch of extra gain. I must assume that the few people who reported frequency response problems must have received a defective box. I hope they all first called Crutchfield and tried a replacement before blurting out those bad reviews. I'll slightly qualify my review by saying my alternative to this setup is the Sirius FM transmitter. So even if I lost a little frequency response with this box in-line, it is still far better sounding than my alternative.

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2 of 2 found this helpful

Does what it says it does!

Kevin from Pell, City Alabma on 5/29/2009

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I have XM connected to a boom box. The stereo was making allot of hissing noises and some high pitch sounds. Twice there was an audio spike that burnt up the audio board in the Delphi receiver. I can tell a HUGE difference since purchasing this little gem. If you have XM and are using the line out jack, you want this!

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1 of 1 found this helpful

Great product!

meskin from Washington, DC on 5/15/2009

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I use this for my portable Inno XM player and it works like a charm. Before I used it, I had some nasty sounding ground noise whenever I 'd hook up the Inno to my "Aux In" on my head unit. I could always crank up the volume and drown the noise out, but I shouldn't have to do that. This thing effectively eliminated all ground loop noise. Awesome product!

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PAC SNI-1/3.5 Noise Filter

James from Apison, TN on 5/2/2009

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Item does exactly what it is supposed to do. I installed it in the auxiliary input line and it eliminated the high-pitched alternator whine that had plagued my for several weeks.

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This little thing is a savior!

Dave from Quincy, IL on 4/29/2009

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Like everyone else that wrote a review for this, I had a whining noise when I had my iPod plugged into the 12v outlet in my SUV. It drove me insane until I came to Crutchfield and did a search and came across this magical little devise. ( I have a Dual brand stereo with the rear auxiliary input with iplug connector) The noise was only present when my iPod was plugged into 12v power, so I knew it was either wiring interference or alternator whine.....the PAC Noise Filter took care of it ALL....literally took me 2 minutes to plug it into my stereo cable running from my iPod to the iPod connector that came with the Dual stereo (or auxiliary input jack on some stereos) and tucked the PAC Noise Filter behind my stereo in the dash. Great item for great price!

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2 of 2 found this helpful

Works with laptop hooked up to home stereo

Bob from Austin, TX on 4/24/2009

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Excellent widget. I was tring to listen to music from my laptop on my cheap Sony home theater stereo by running a line from the laptop headphone jack to the stereo's audio in line. It was so noisy and buzzy that I couldn't stand it. I mean really really loud. This filter eliminated ALL the noise, and has the right 1/8" jacks on both ends so I could plug it right in. Very very pleased.

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1 of 1 found this helpful

Nothing short of Spectacular

Shantie from New York, NY on 4/1/2009

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First off I have never writtten a review on anything before. To preface I bought an adapter for iPhone and iPod, for my iphone and Lexus IS250 AWD. As soon as Plugged everything in there it was the hissing, winding sounds coming from the ground. Frustrated i began searching the internet for an isolator, and I landed here. had it over nighted and justdropped it into the car. Upon starting the car with fingers crossed I waited to hear even the slightest of noise coming from the speakers, NADA. This unit has completely gotten rid of and feedback I once had.

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1 of 1 found this helpful

PAC SNI-1/3.5 Noise Filter

Damian from Atlanta, GA on 2/6/2009

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This little device is just what the doctor ordered! They are easily taken apart to shorten the leads or add jacks. The little amplifier in the circuit replaces the audio volume lost to the transformer. I am using them to isolate audio circuits to an Autocom intercom on a motorcycle. They work flawlessly.

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3 of 3 found this helpful

Solved noise problem with iPhone in Prius

Allen from Des Moines, IA on 1/17/2009

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I have a 2007 Toyota Prius. When I hooked up my iPhone to the AUX IN jack, I encountered interference noise. Some web searching led me to various forums suggesting this gadget from Crutchfield. I purchased it, hooked it up, and the noise went away. Perfect solution. The only thing I wish it had was two male plugs instead of a male/female. That way, it could be used to directly connect between the device and the AUX IN jack without me needing to buy a separate cable. For others, though, this path-thru arrangement may be ideal.

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2 of 2 found this helpful

Works perfectly

acepelon from Austin, TX on 1/13/2009

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I just got this based on reviews here on Crutchfield. Couldn't find it anywhere in town so I was hesitant because I didn't want to have to return it. I drive a 2006 Prius and this thing works flawlessly. Now I can charge and use my iPhone/ iPod classic without that horrible whining noise- and no I don't mean my wife :-)

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4 of 4 found this helpful

AWESOME!!!!

richard from Hammond, LA on 11/15/2008

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I was skeptical at first, but i decided to give this product a try after reading the reviews. i have a Mazda 3, and my Sirius Starmate 4 was being connected directly to the AUX input in the center console. Had alternator whine in the system since day 1. I tried re-routing all of my cables to seperate them from noise producing conductors with no luck. i installed a Sirius hardwire power supply to make sure everything was grounded with no luck. Then i put in a power line noise filter with no luck. Even tried multiple sets of magnetic ferrule chokes with zero difference as well. Then i bought this noise filter... This item was the first product i have ever seen completely eliminate 100% of the alternator noise!!! BUY IT!!!! IT WORKS!!!!! Don't know how it works, but it did the job. I wish i had known about this a long time ago. I spent 8 months fighting to get rid of the noise. Tell your friends and family, this will work!!!!!!

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6 of 6 found this helpful

Great!!!

Joe from Arizona on 10/22/2008

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Bought this after trying several others. I tried the power filters and audio filters, some costing twice as much as this one. I finally tried this one and WOW! It worked. I have it installed between the satellite radio and the aux input of my 2004 Honda Goldwing. I had the whine from the alternator. Now I don't. If you need to get rid of alternator whine, this is it! Thanks Crutchfield for great prices and fast shipping.

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2 of 2 found this helpful

Works great!

Gnarlodious from Santa Fe on 10/20/2008

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I had a persistent problem with static noise when music was not playing or the computer was sleeping. This little gizmo fixed it real good. Now perfectly quiet.

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1 of 1 found this helpful

PAC SNI-1/3.5 Noise Filter

AL from Kentucky on 10/11/2008

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Awesome product. Works great as previous reviews have stated. Had a Sirius radio plugged in acc. jack and had an alternator whine, especially on news channels. This solved it and very easy to install.

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PAC SNI-1/3.5 Noise Filter

Rob from Boston MA on 10/2/2008

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Great product! It worked as it said it would. I used it to filter out an annoying hiss from my XM radio to a new radio I had installed in my Sequoia. My issue was easily and instantly resolved!

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Works, but...

crb from St. Louis, MO on 9/20/2008

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Took the engine noise out of the line, but also took all the lows and highs out also.

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1 of 1 found this helpful

Works like a charm!

Lester from Mason, Ohio on 9/9/2008

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Our new 08 Kia Optima has an awesome sound system with an AUX input. When I plugged the satellite radio into the AUX jack there was a terrible whine that changed pitch with engine RPM. It was most noticeable on talk channels and quieter music channels. I plugged this little gem in and the noise was totally gone. There was no noticeable degradation in the sound output.

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It works

Rahil627 from Chesapeake, VA on 8/28/2008

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I have a 2007 mazda 3 that came with an AUX connection. When I attached the charger, it would generate audible interference...this solved the problem.

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5 of 5 found this helpful

This really does what it is intended to do....

Maxwell from Owings Mills, Md on 8/22/2008

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I have used this product several times, and it as not let me down once. I recently used one to get rid of alternator whine, and various other noise in a system. I decided that this was a much cheaper option than pulling various parts (and possibly the engine) out to get to a very hard to reach alternator to install a capacitor. Well worth the money!!!!!

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Gets rid of the buzzing sound

Gardner from Philadelphia on 8/7/2008

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I have a 2007 Toyota Camry SE, and have always been annoyed that I can't plug in my XM radio directly into the aux jack (high-pitched whining sound occurs when I do). It was almost like the connection wasn't grounded. Very frustrating. I had to use the FM station converter, and the sound quality was not that great. THIS PRODUCT IS AN AMAZING, EASY AND INEXPENSIVE FIX!! For less that $20, plug your XM radio into it and then into the aux outlet for no static noise and good sound. HIGHLY RECOMMEND!!

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1 of 1 found this helpful

AMAZING!

Nura from Philadelphia, PA on 6/25/2008

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Doubters beware! This product is phenomenal. I own a Mazdaspeed6 and installed a product called audiolink which adds an auxilary port to my car. I have a bose head unit. When i hooked up my ipod to the audiolink device, there was no static at all. Then, i hooked my ipod to a power source within the car, and thats when the static noise kicked in. It was loud and just irritating. I then bought a Ground loop isolator and it was worthless! I finally came across this device from crutchfiled and all I gotta say is, I am amazed. It has gotten rid of ALL static noise. NOTE: I am not some one who usually signs up on websites to write reviews. But, after months of frustration and finally finding a product that works, I felt the need to spread the word. all I gotta say is BUY IT!

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7 of 7 found this helpful

THIS IS IT!!!

Scott from Orlando, Florida on 4/18/2008

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All I can say is that 5, that is right FIVE filters later, I found the solution. This thing is amazing. Not only within the same price range as the previous filters tried from local car audio installers and another online vendor, but this actually works. This was being used in a carputer application and I was getting TERRIBLE ground loop noise on the analog audio line. Even at low volumes, I was hearing the ground loop. Now, even at the higher volume, it sounds the way it did at the lower volume. There is no way I could ever turn the volume up that loud. So at the normal range that I would listen at, you cannot even hear a hum. Awesome job PAC. Crutchfield also came through with next day delivery of the goods, even when only ground shipping was selected. I guess they have a local distribution center. Awesome!!!

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Problem Solved!

Chris from Chicago, IL on 4/17/2008

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If you are experiencing the alternator whine problem as myself and the rest of the reviewers here were, this is the product for you. After installing the SNI-1/3.5 Noise Filter in my car for my iPod (which took about 5 seconds) the alternator whine was not just reduced, it was completely GONE. Also, there was no loss of sound quality. As another reviewer stated, I did notice a little reduction in the "highs" but it wasn't anything a little adjusting of the equalizer couldn't fix. I highly recommend this product to anyone with the alternator whine problem. I also highly recommend Crutchfield. Great prices and fast shipping. It took 2 days for me to receive my order with standard shipping.

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1 of 1 found this helpful

Works Perfectly

James from Ohio on 4/14/2008

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I recently installed Sirius radio in my 2008 Toyota Solara. Unlike previous vehicles I owned, the Solara has an auxiliary input jack, which is the best method for feeding audio into your factory system from an external source. The problem was that I had the Sirius wired into the auxiliary power input outlet right next to the audio input and there was terrible alternator whine. I installed this puppy in 15 minutes (it's behind my dash board) and now my audio is crystal clean. Thanks Crutchfield.

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PAC SNI-1/3.5 Noise Filter

George from Burlington Vermont on 2/29/2008

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This product is amazing...I was totaly blown away with how well this resolved my hissing and atlternator whine. Simply plugged it in like the directions said and it was GONE! I used this on my 1997 Honda Valkyrie motorcycle. I was trying to run a Sirius Satelite reciever and couldn't stand to use it because of the whine and hissing. I love this product...it really works. Now I can ride all summer and enjoy my Sirius radio.

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I was really frustrated!

Joseph from Englishtown, NJ on 2/16/2008

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I installed a Garmin Nav system (with built-in MP3 and XM ) as well as an IPOD connector into my Mazda 6 2006 . The IPOD was GREAT! The AUX i/P for the Garmin (MP3 and XM) was terrible - hissing and engine whine - really bad! I bought a ground loop device - no good. I bought another ground loop - no good! I found this site and these reviews and had serious doubt! I went for it, just installed it and it's GREAT! All my problems are GONE! Yes it does reduce the quality of the highs a bit - not by much! It's the best thing since sliced bread. Joe

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It Works Great!

Derek from Los Angeles, CA on 1/29/2008

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Like many of the other reviewers here, I was running Sirius satellite radio (Starmate Replay, hard-wired via a stereo mini-jack cable) through my aux port on my 2007 Toyota Camry. The high-pitched whining, which varied in pitch as the engine RPM varied, was so bad that I didn't want to use the Sirius radio anymore. I had tried a "shielded" cable from Monster but it made no difference. I bought this product from Crutchfield after reading all of the reviews. It took about 10 seconds to install. Now I can't detect any whine at all! It works equally well when my wife's Ipod is attached. Definitely worth the money, since anything playing through the aux port was basically unlistenable before, unless the car was at idle. Now it sounds great.

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good product

dan from Charlotte, NC on 1/27/2008

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I wired a sirius Sportster 4 into a AUX in device in my 06 4Runner. There was a hum. This filter completely removed it.

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No more whine

Nicholas from P'cola, FL on 1/9/2008

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I have never seen a noise filter work this well. I had serious alternator whine with my new Sirius radio plugged into the aux input on a iPod DiCE in my BMW. There is now only the faintest whine, but you have to turn the stereo all the way up and the sat all the way down to just barely hear it. At normal listening levels it is completely gone. Even on talk radio!!!

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Ground Loop noise gone for good!

pakong from Hampton Roads, VA on 11/7/2007

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I'm using a MIO C520 in my 2007 RAV4 LTD plugged in to the AUX jack. I've tried ground loop isolators for over 15 years and nothing works as effectively as this unit. I expected the noise to be reduced but instead it was completely gone or not discernable to my ears even with amplification. This product is truly amazing.

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No more whine!

Damond from all 48 states on 9/23/2007

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I'm an over the road truck driver. After getting a radio in my truck with the aux input, I plugged my Sirius receiver in... Oh Dear God. It was almost as brutal as driving through the desert with no radio at all! I knew there was one place and one place only to look for the fix! Thanks Crutchfield!!! PS. I've been asked several times out on the road, what can be done about this on the CB. I tell them Crutchfield.com

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No More Whining

Bill from Philadelphia, PA on 8/22/2007

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After reading several reviews, I decided to buy this item since I've been experiencing a high pitched whine in my speakers as I drive (the faster I went, the louder it became). I admit, I was doubtful about my purchase at first. After receiving my package (incredibly fast BTW), I installed the module and was pleasantly surprised with the sound quality. Even as I cranked up the volume, there was no distortion whatsoever! (To me) it sounded like i popped a regular CD in my player. I would recommend this product to anyone who has a satellite radio or mp3 player plugged into an AUX port & using a cigarette lighter adapter. I couldn't be happier with my purchase!

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PAC SNI-1/3.5 Noise Filter

nate from enfield ct on 8/10/2007

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I bought a toyota rav 4 2007 with the aux input. I have had sirius radio for over 2 years, and have waited for the day that i could bypass the Fm transmitter. But to my disapointment, that annoying hum that everyone describes in great detail blaired through my system. After doing my research I came across this product, ordered it and 24 hours later it was at my doorstep....I hooked it up and wallahhh! NO MORE NOISE!!!!!! crutchfield rules.

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You won't hear me whining anymore! ;)

Lisa S. from Willoughby, OH on 8/6/2007

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I give Crutchfield & This Product 5 Stars!!!! 1) Quick Shipping. 2) Fantastic Customer Service(up to date status,etc.) 3) Extremely Helpful Customer Service Reps. 4) Easy as cake to install. 5) Product works perfectly!! *If you are hesitating about purchasing this product, DON'T...The quicker you order this product the quicker you'll be in heaven listening to your Sirius Radio or iPod. This has put to rest so many frustrations.

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No more whine....Hallelujah!

Irene from Staten Island, NY on 7/6/2007

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I have a 2006 VW Touareg with the built-in AUX ports in the center console. Using any of my MP3 players or my Ipod with the RCA cables in the AUX and also charging thru the 12v adapter caused an awful whining noise which seemed to be speed dependent....the faster I went, the louder the whine. If I unplugged the charger and used the battery only, the noise would disappear. This very simple-to-use device did the trick. I can now play and charge at the same time in peace!

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A World of Difference!

Chris from Arlington, VA on 7/5/2007

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I'm so happy with the noise-reduction this filter achieved!! I run my iPod through the AUX-in jack in my Prius, while powering the iPod off of the AC/"cigarette ligher" outlet. The hum/whine that was constant before, is now completely gone. (I'd used an iPod FM transmitter before for about 5 years, while powering the iPod off the AC outlet in my Honda Accord; when I got the Prius, with that built-in AUX-in jack, I wanted to eliminate the FM transmitter entirely and stop searching for "empty" FM frequencies. But I was disappointed with the power-outlet hum, right away.) My first filter arrived and seemed to be fine for a day, until I hit a bump in the road, that jostled all the contents in my armrest compartment, and the sound suddenly got all watery and thin. I thought the iPod was dying, but went through the whole setup, from iPod to filter to 1/8" male-male connection wire; traced the problem to to a loose internal wire/short, where the wiring meets the female jack head on this filter. Crutchfield immediately sent a replacement, and it has been perfect. I definitely recommend this product!

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5 of 5 found this helpful

PAC SNI-1/3.5 Noise Filter

gfreek from Attica, NY on 7/4/2007

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Installed Sirius Starmate 4 in new 07 Toyota Rav 4, connected to AUX input. The humming noise that changed pitch with engine speed was terrible. I found this searching the net for filters, ordered 2, one for Toyota and one for future use. It works great, highly recommend this product

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Completely eliminated hissing (my car) whining (wifes car)

Robert from Austin, TX on 6/15/2007

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My wife and I both have 2006 Scion xB's... we also both have Sirius Starmate Replay units connected to the factory aux port. My wifes car had a horrible engine whine & my car had a hiss (and slight whine). I bought two of these, installed them in both cars, and the sound is now crystal clear. EASY install - definately recommended.

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PAC Noise Filter-Worth Every Penny I Paid for it!

Frank from Pittsburgh PA on 4/19/2007

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My girlfriend and I both have Sirius Radio's. We have a Nissan Altima and an Xterra. I installed the Radios and hardwired them using RCA to mini-jack cables. After the install, there was a LOUD whining noise heard through the speakers in both of our cars. (My Altima was much worse than the Xterra.) The noise got even worse while accelerating and driving at highway speeds. After I almost returned my radios, I found this noise filter on Crutchfield. I decided to buy 2 of them to see if they would fix the problem. After I installed them in both cars, the noise completely dissappeared. My Sirius Radio now sounds like I am listening to a CD! No fuzz, hissing, or whining whatsoever. I completely recommend this to anyone who has a whining noise when listening to their iPod or Satellite Radio in the car.

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Perfect for Mazda 3 owners

Kristina from Maryland on 3/23/2007

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I have a 2007 Mazda 3 with an AUX jack/Bose system/amp. If I used my iPod with a 12v charger I would get unbelievable engine noise/interference through all speakers. I had almost given up hope until I found this product. Got it yesterday and it works like a charm- the noise is 100% GONE. The best part about this is that no modification has to be made to the car at all, and since my AUX jack is in my center console- you don't even see the very small box. As far as I'm concerned.. every Mazda 3 owner with an AUX jack should purchase this right away. This is a known problem for the car which has been posted in a few Mazda 3 forums.

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Just as Advertised

Michael from York, PA on 1/29/2007

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I contacted Crutchfield with a feedback problem and they immediatley suggested this product. Ordered it one day, received it the next, and I am now listening to my Sirius radio in CD quality (or close enough for my untrained ear).

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PAC SNI-1/3.5 Noise Filter

Raul from north bergen, NJ on 1/23/2007

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This thing works great!!!!!!

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Noise Filter

no from Saugus, CA on 1/19/2007

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My expertly packaged order arrived today ahead of schedule. The item was as advertised and performs it's function perfectly. I installed satellite radio about a week ago in my '06 Scion TC. I plugged it directly into the auxiliary jack in the armrest and got ignition noise that was unacceptable. I researched my issue on the web and learned about ground loop noise isolators. I was directed to your web site when I searched the previously mentioned item. I could not be more pleased with the service I have received or with the item I've purchased.

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Exactly the producy you're looking for!

Joseph from Boston,MA on 1/16/2007

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I recently purchased Sirius with a life time subscription. I was very disappointed with the sound quality at first. I had a terrible electronic buzzing(obviously a ground related problem) in my personal car and a fainter, yet similiar sounding noise in my work truck. I initially thought the problem was the satellite receiver and actually went through the trouble of sending it back as defective. When the replacement receiver showed the same exact problems, I knew for sure it was a ground loop related problem. I was going to take my car to a stereo store to have a ground loop isolator installed at a much higher price when the sales rep. mentioned that they get there parts through Crutchfield. I decided at that point to research it myself. That turned out to be a really great idea. I read the reviews written prior to mine and saw the overwhelming positive feedback so I figured that this was going to solve my problem. I'm happy to report that it did and then some. Not only has the humming disappeared but I truly believe that over all the sound quality is much improved. The sound I was getting in my work vehicle was tolerable but I now take my noise filter in my work truck everyday becaue the difference is noticably better. Sirius should seriously (pun intended) consider installing a similiar noise reducer directly in there next generation of players. Consumers would be noticably happier. Overall I'm extremely satisfied with this product.

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3 of 3 found this helpful

Sirius S50 MUST HAVE

swagge1 from Baton Rouge, LA on 1/11/2007

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1998 Nissan Frontier I had the same sypmtoms that basically everyone else mentioned. Whining in speakers that coresponded with RPM. The noise could only be heard when using my Sirius S50 with the AUX port on my CD player. FM radio was fine. It was only when the cigarette lighter was plugged in that the noise would come. After plugging in this filter the noise was 100% gone!! I really can't tell if any sound quality has been lost using this filter either. It is a MUST have if you're experiencing AUX problems from your cigarette lighter charger.

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Made matters worse

Bill from Cleveland, OH on 1/8/2007

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Ordered this to try and clean up the alternator whine I was getting while using my Harmon Kardon Drive+Play via my factory aux input. It didn't eliminate the alternator whine but did eliminate most of the bass from my ipod! A waste of money and a disappointment.

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3 of 7 found this helpful

The best

rude dog from the OC on 1/5/2007

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I have a 2007 Toyota Prius. The car is full of electrical wiring and crap. I installed xm radio and it plugs into the cars existing auxillary jack. There was a horrible hiss coming from the power source (cigarette lighter). The tech support at Crutchfield told me that this device may not work because it was used more for a "whine" noise (the type that gets louder as you accelerate). I bought it anyway and it came very quickly. This device boosted my signal and eliminated the noise instantly!!!!!!!!! Headache gone.

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No more feedback through AUX port

Michael from Murfreesboro, TN on 1/5/2007

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Scion tC with Sirius using AUX port. Using my Sirius radio through my AUX port was quite annoying. There was engine/transmission feedback (a whine or buzzing noise) when using the Sirius radio through the AUX port and powered by the cigarette power adapter. My iPod had no feedback/whine. Bought this unit and the whine/buzzing is completely gone. Recommend this to anyone that has a AUX port in their vehicle especially if using a satellite radio.

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3 of 3 found this helpful

Worked perfectly

Tony from Boston, MA on 1/4/2007

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After trying to connect my laptop to my receiver, I was hearing a very loud hummmmmmm. After reading reviews online, it was pretty clear I was listening to interference caused by a ground loop. I purchased this product based on the multiple good reviews and It worked perfectly as soon as it was plugged in. Even at extremely high volumes, the sound is crystal clear with no hissing or humming......buy this product with confidence!!

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PAC SNI-1/3.5 Noise Filter

Sam from New York on 12/4/2006

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Noise Filter / isolation transformer, worked perfectly

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It works

Jason Fine from Northeast on 11/14/2006

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I was getting noise/whine when connecting my plug-and-play satellite radio to the Aux-In on the back of my head unit. This whine was only there with the car-powered devices, not battery powered ones. As a last resort I tried this unit on the Line-out from the satellite radio and it completely eliminated any whine. The only problem was that it came with the exact opposite gender connectors on it from what I wanted. The line out on my sat radio required a male plug (this unit came with a female input) and my aux in cord from the head unit was already male (the output on this unit is male) so I needed a female-female coupler to hook it up. Make sure you dont hook it up backwards or you lose its built-in amplification. But once its hooked up it works great!

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5 of 5 found this helpful

PAC SNI-1/3.5 Noise Filter

Mike from Reno,NV on 10/19/2006

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The aux jack in my mazda 3 had such a bad whine when using my Sirius One hooked to it I almost couldn't stand to listen to my radio. This product worked perfectly, taking away all noise. I will definately purchase another one for my truck.

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Crutchfield rocks, and so does this.

Justin from Frederick, MD on 10/18/2006

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I was all excited to use an iPod in my new Mazda 3, but after plugging it into my AUX and cigarette lighter ports, there was an annoying high-pitched electronic noise along with the music. It was not a hum or alternator noise, but rather EMI dumped to ground by the iPod's circuits. This filter came highly recommended, but I still had some trepidation about ordering it; most such products, if they work, cause bass roll-off, muddiness or other sound degradation. After I received it (overnight with standard shipping!), I can say very happily that it not only eliminated the noise but did so without any adverse effects on the sound (as far as my untrained ears can tell). Bass is still deep and controlled, and treble & midrange sound as good as ever. This tiny wonder is also the only ground loop isolator I've found anywhere that has mini-stereo plugs, which is an incredible boon for my application. Don't hesitate to buy it now!

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9 of 9 found this helpful

No more whining

Robert from Bay Area,CA. on 9/30/2006

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I have ceiling mount dvd player which I recently connected to aux input on my Dual 7710 car stereo.Dvd audio sounded fine when truck wasn't running but as soon as I started motor the whining noise was horrible.I check all the grounds,wiring connection and installed a couple different noise filters, nothing worked.Until I purchased the PAC SNI-1/3.5 Noise Filter.Im very impressed with this product not only did it eliminate whining noise but Installing the PAC SNI-1/3.5 Noise Filter took less than a minute.

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3 of 3 found this helpful

Great Product!

Ian from Washington, DC on 9/29/2006

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When I plugged my iPod into the aux input of my new Saab, I had engine whine. I picked up this mini-jack ground loop isolator, plugged it in between the aux input and the line out and the whine was gone. How simple!! It worked like a champ. Highly recommended.

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3 of 3 found this helpful

Bad Little Box

Packard from Florence, SC on 9/20/2006

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This thing is perfect for the alternator whine or pitch that you get from connecting aux's to your system. I had this issue in my suburban with dvd player output and didnt know how to correct it, but now I do. This worked perfect for my 4Runner's aux input in the center console. I was installing Sirius and it was terrible sounding with the high pitch and buzzing, but this box cleared it up immediately! Great Product. Come to the right place....Crutchfield.

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I was doubtful, but it worked wonderfully

George from Groton, Ma on 7/21/2006

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I had what I guess now was alternator noise in my car - lots of whining and buzzing. I was trying to use a portable DVD player powered by the 9V jack, with the audio output going to an FM transmitter, also plugged into the 9V jack. Now that I think about it... definite loop there. Anyway, the noise rendered that setup unusable. I had been using a battery powered FM transmitter (worked OK) which had to be replaced due to cable fatigue (came apart). I replaced it with an iRock FM transmitter which is 9V power only, no batteries. I put this filter between the DVD audio out and the FM transmitter audio in and the noise is gone. Highly recommended.

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3 of 3 found this helpful

PAC SNI-1/3.5 Noise Filter

allenc3 from Green Cove Springs Florida on 2/10/2006

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Just installed $20,000 worth of avionics in my Grumman Tiger (aircraft). As I have an XM Radio / Sat Weather System, I wanted to run the Sat Radio Audio through the aircraft intercom system. Got a very high pitched noise when plugging in. Tried everything I could think of to get rid of this noise including expensive alternator filters, etc. Stumbled on this product by accident. Took every bit of alternator whine out of the system. Great Product. Have spread the word to other pilots who are trying to interface their new Garmin 396's into their plane intercoms.

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3 of 3 found this helpful

Exactly as advertised

edward from Huntington WV on 1/15/2006

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Excellent! I purchased this filter for my gpsmap 396 in my airplane and it completely removed the alternator noise. I am completely satisfied and I have purchased another one for a new audio device in the same plane. Piper Warrior 1974

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Crutchfield response on

3 of 3 found this helpful

Scion aux port buzzing

glen from San Diego, CA on 12/16/2005

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Verified employee purchase (What's this?)

I have portable Sirius satellite radio, which I plugged into my Scion's "AUX" port. Terrible buzzing at idle, and alternator noise. Bought this ground loop isolator... all noise is GONE. Works great.

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9 of 10 found this helpful

PAC SNI-1/3.5 Noise Filter

Gene from Mount Holly, NJ on 12/12/2005

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I bought this because I use an MP3 player and XM music in my airplane, but it was totally unusable due to whine and whirl noise. This product fixed that 100%! I highly recommend it. '71 Cessna Cardinal RG

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1 of 1 found this helpful

Works great!

Cosgrach from Bay Area. CA on 9/27/2005

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This thing works great! I've ordered several to help deal with ground loops in both the car set up and when connecting my computer to the home amplifier. No more whine or 120Hz humm! Fantastic!

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14 of 15 found this helpful

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More details on the PAC SNI-1/3.5 Noise Filter

Mark G.

Product Research

Features

Application: This noise filter is great for eliminating ground loop noise between an auxiliary source and radio.

Frequency Response: This noise filter has close to perfect frequency response of +/- .03 dB from 20-20kHz.

Gain: Unlike other manufactures that use 1:1 transformers, PAC utilizes proprietary audio transformers for a 1.3 dB gain to compensate for any signal loss that may occur due to additional connections in the signal path.

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Customer Q&A

Q
Crutchfield asked: Why did you buy this?
A
I chose this item to eliminate the weird noise that comes from my car stereo when I'm charging my phone and plugged into Aux. [ Adam  Aug 21, 2019 ]
A
It was recommended by several people on a Mercedes Benz forum. [ Christopher  Jul 24, 2018 ]
A
Hoping to eliminate buzz from headphone jack output of an IMAC to input of a sound mixing board. [ Douglas  Jan 24, 2018 ]
A
To deal with electronic noise in my work vehicle, when charging phone, and using the AUX input on the factory radio, at the same time. [ COURTNEY N  Dec 21, 2017 ]
A
Same reason everyone did. AC whine. [ Eric Vincent  Sep 30, 2017 ]
A
Playing spotify music thru android phone/tablet while also charging device caused alternator whiiiiiine. Very annoying, many have reported this fixed the problem....we shall see. Test run your gear guys...I thought my original cause was bad amp and bad wiring install. I pulled the wiring and amp and still had the noise...So I am gonna try this noise filter. [ Shannon  May 28, 2017 ]
A
Our 2008 Prius has a noise issue when using the aux port in the center console with an ipod. We have used this device before in another situation and it is very effective in noise reduction. [ Jim  Dec 21, 2016 ]
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After reading the reviews and needing to reduce the noise from my aux port in the car while charging my tablet. [ Pamela B.  Mar 31, 2016 ]
A
I get a static sound from my Aux port in my 2007 scion tc when my bluetooth dongle is plugged into the power outlet in the glove box. [ Xavier  Feb 07, 2016 ]
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I read the reviews and liked what was said about this item. Can't wait to get it!! [ Jan  Dec 05, 2015 ]
SHOW MORESHOW LESS

3 questions already asked

Q
Will this filter effect sound quality?
[ John Lovett  Apr 20, 2016 ]
3 answers
A
I bought this item a while ago and have not used it in more than a year. My recollection is that it did a good job of reducing background noise (which is the problem that I was having - a whistling or high pitch in the background). It reduced sound quality a little but overall I had a better sound experience with the reduction of the background noise.
[ STANLEY  Apr 21, 2016 ]
A
it works very well for me i had a humming its gone now so it works for me
[ Henry  Apr 21, 2016 ]
A
Makes it better, especially at lower volumes. The filter provides a very well-crafted Signal-to-Noise Ratio that dramatically improves the quality; no hiss is heard even when the there is no sound.
[ Vernon  Apr 21, 2016 ]
Q
I just recently installed a new aux cord into my car. It works! But when I turn on the engine and play music on my phone, I hear a whine. And when I rev the whine increases. This occurs with only the aux cord connected to my iPod (does not matter if it's charged). Will this be a remedy? The whine does not occur when I switch away from aux as the choice for music input.
[ James  Sep 02, 2015 ]
1 answer
A
If you purchased the product from Crutchfield, feel free to contact our Tech Support team. They can walk you through the settings on the product and see if there may be a fix. Our toll-free Tech Support number is printed on your invoice, and is also available under the "My Orders" tab in the "My Account" section of our website. If you did not purchase the unit from Crutchfield, then you may want to contact the manufacturer. You can also post your question in our forums: http://community.crutchfield.com. Or try our online support center: http://crutchfield.custhelp.com/app/answers/list/kw/.
[ Krissy  Sep 02, 2015 ]  Staff
Q
You folks have no directions for proper hook-up on your item box! I am sure many people have this device hooked up wrong. I was always told to go from output to inputs or vise versa when hooking stereo equipment up. So with that said....my Ipod is the output and so the Ipod will get plugged into the INPUT cable of the suppressor. Correct? Outty to Inny! Now my Output cable on my suppressor will plug into my input of my Aux port...Outty to Inny Correct?? Thank you
[ Don  Jan 22, 2014 ]
4 answers
A
Correct, that is how I connected it and it worked. If you were to reverse that connection you would need male/female adapters.
[ ROGER F  Jan 22, 2014 ]
A
Yes, the "output" of the iPod goes into the "input" on the PAC SNI-1/3.5 Noise Filter. The "output" on the PAC SNI-1/3.5 Noise Filter plugs into the "input" of your car stereo. So, you are correct! It works like a charm in my 2005 Mini Cooper S Convertible!
[ Ron  Jan 22, 2014 ]
A
yes, that's correct. The male connector goes to your Aux port. Good luck, Dirk
[ Dirk  Jan 22, 2014 ]
A
It doesn't matter how you hook it up. I did it both ways and conducted an unofficial road noise test. For me, it made more sense to hook the box up directly to the AUX input on my vehicle. That way I was able to hide the box out of sight and use a longer, more user friendly 3.5mm to 3.5mm male to male cord to hook up my device to the box... Good luck, this item works as advertised.
[ DOMINIC PALLONE  Jan 22, 2014 ]

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