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PAC SNI-1 RCA Ground Loop Noise Isolator

Item # 127SNI1

22 questions - 35 answers

Item # 127SNI1

In stock
$9.99

About the PAC SNI-1

The SNI-1 preamp noise filter plugs in between your receiver's preamp outputs and your amplifier. Warranty: 60 days.

What's in the box:

  • Noise filter w/ 11" RCA input leads
  • Instructions
MFR #SNI-1/50

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4.5 out of 5 stars
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More details on the PAC SNI-1

Mark G.

Product Research

Features

RCA Ground Loop Noise Filter: Use the PAC SNI-1 when noise is caused by ground loop through RCA cables between head unit and amplifier. The SNI-1 will plug in at the head unit end (ground wires are optional if you are not getting an audio signal). The PAC SNI-1 provides 1.3dB of signal gain to compensate for any signal loss that may occur due to additional connections in the signal path. It supports up to 20-20,000Hz (+/-0.5 dB) frequency range.

Note: A SNI-1 is needed for each 2 channels of your amplifier. A 2-channel amp will need a single SNI-1, while a 4-channel amp will need two SNI-1 filters. A 5- or 6-channel amplifier will need three SNI-1 filters, and so on.

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Customer Q&A

22 questions already asked

Q
I recently added the JL MX280.4 and the JL MX300.1 to my car stereo. I now have a whining noise that increases with engine rpm. Will these filters help me? And how many will I need? Does the 4 channel amp require 2 filters?
michael d  Mar 03, 2023
1 answer
A
It is possible that the SNI-1 could help, though engine whine can be tricky to diagnose. If you were to use this product, you would want one for every two RCA connections (in your case, three of them).
zachary  Mar 08, 2023 (Staff)
Q
Can I use only one of the RCAs for a mono subwoofer in my home?
ryan  Feb 06, 2023
1 answer
A
I would not use this PAC SNI-1 if you are having home troubles, Ryan. For any noise (especially ground loop) in a home setup I would advise using a grounded cable first like the AudioQuest Black Lab in the link below. The cable can be purchased in anywhere from 6-50 plus feet in length to cover any install. The integrated grounding strap can solve noise and hum issues, and the AudioQuest quality can even tighten up the sound! https://www.crutchfield.com/p_703BLAB5M/AudioQuest-Black-Lab-5-meters-16-4-feet.html
bo  Feb 06, 2023 (Staff)
Q
Do I need male to male adapter cables to connect between the amp and the head unit?
angel-ivan  Mar 23, 2022
2 answers
A
yes
william  Mar 25, 2022
A
You should have male pigtails on the wiring harness. That's how mine was setup on a 2000 Lexus ES.
matthew  Mar 24, 2022
Q
Is this necessary without an external amp? Or only for use with an amp?
derek  Sep 15, 2021
1 answer
A
Im not sure. My truck has the factory Rockford Fosgate amp and I needed these to eliminate a loud pop upon power on and off with the vehicle.
clifford  Sep 18, 2021
Q
im running a preamp EQ.with 2 inputs from HU. An 6 outputs. All going to one 5 channel amp. Do i need just one between HU an EQ or do i need three,one for each set of outputs?
martin  Nov 17, 2020
1 answer
A
Do the speakers wine when the head unit RCA's are not plugged into the amp? If yes, re-ground your amplifier. If that doesn't work and you can't return it, you'll need it for all six outputs. If no, you'll need to install these inline from head unit to amplifier.
bolt  Nov 29, 2020
Q
Does this need to be plugged into the head unit end to work? I have it plugged into amp side and no change. I have not used optional ground wires, did anyone have any success after grounding them out?
jordan  Sep 22, 2020
3 answers
A
i believe it is designed to plug into head unit end. The instructions tells you to plug male RCA's into head unit. An plug RCA's coming from amp into female end of device. An if needed Gnd wires go to source(head unit) chassis.
martin  Nov 17, 2020
A
Yes grounding out worked for me!
drew  Sep 22, 2020
A
I plugged mine to amp side, I also grounded it, that helped alot. If that doesnt help, Id try plugging into stereo side to find out if it makes a difference. Dont forget to ground the wire. I believe you can use one noise suppressor at both ends. Check with tech support on that one. Good luck.
jerry  Sep 22, 2020
Q
Just installed a new car stereo and itâ??s whining while Iâ??m accelerating, also sort of a static sound while parked. Will this loop isolater help? And does it plug directly into the back of the stereo?
jacob wesley  Sep 01, 2020
2 answers
A
Unknown. It was suggested I install these to stop a loud popping noise when I changed sources.
patrick  Sep 04, 2020
A
It worked for me but it's not perfect. I still plan on doing it right and running ground wire from amp to battery. Overall, though, it has got rid of 85% of the whine.
michael  Sep 01, 2020
Q
Installed a new car stereo and now I am getting a whining from speakers when accelerating, also sort of a static sound when parked. Will this help? And does it plug in right into the back of the stereo?
jacob wesley  Sep 01, 2020
3 answers
A
Yes this item will eliminate the static winning noise. It grounds out the noise from the alternator. The whining sounds come from the alternator. Good product....Your alternator is not the problem.
ken  Sep 01, 2020
A
Yes it will help out alot and yes rigjt back of the deck and add to ground of the deck
lee  Sep 01, 2020
A
good ground check all I installed this & the other inline suppressor, it quit for a while reduced more then quit , now is back best thing is to isolate the alternator, your stereo should only draw power from the battery, yes depending on the back of the stereo, rca connection
jeffrey  Sep 01, 2020
Q
Subwoofer hum when splitter is used to dual subs. Will this fix it?
new user  Mar 18, 2020
1 answer
A
Hi Nicholas in my case it worked perfect for my problem,good recommendation by the customer support team the humming when away good luck
ricardo j  Mar 18, 2020
Q
Will this help with the buzz and hum coming from my karaoke laptop to my rca input in my mixer ?
bubba  Dec 21, 2019
2 answers
A
Hi Tommy, thank you for your question. This could solve the problem you're experiencing, but in order for us to be sure that this would be the best product for you, we suggest reaching out to a member of our Pro Audio department. Please chat with us online or by phone at 1-800-324-9695. An Advisor will be able to connect you with that department.
jessica  Jan 05, 2020 (Staff)
A
First, verify that the buzz/hum is indeed coming from the RCA connections. If so, and if your karaoke machine has an external common chassis connection the this should eliminate the buzz/hum being created by the ground loop. Good luck with it.
kristen  Jan 03, 2020
Q
Will this help with the buzz and hum coming from my karaoke laptop to my rca input in my mixer?
bubba  Dec 21, 2019
2 answers
A
It is common for a laptop to cause hum in audio equipment. Try unplugging the power supply from your karaoke laptop and see if that eliminates the hum. If the hum goes away, one on these should eliminate the hum when the laptop is plugged in. I bought a few of these recently and they worked very well, as well as the more expensive 'hum busters.'
gary  Dec 21, 2019
A
I used this in my Silverado to quiet ignition noise.. it might work for this...???
daniel  Dec 21, 2019
Q
will this stop alternator hum?
tate  Mar 24, 2019
2 answers
A
Yes. Had a terrible hum in my boat, and the Crutchfield advisor recommended this for me. I was skeptical, but man, did it do the trick!
john  Mar 24, 2019
A
This helped mine, it does slightly lower overall volume but compared to the hum it was a very acceptable trade off.
mark  Mar 24, 2019
Q
This says it works in the range of 20hz-to 20khz...is this going to limit my input then output to my speakers which are rated to 40khz?
andrew  Oct 02, 2018
2 answers
A
Hello, Andrew! My understanding is that 20k is the high end of human hearing, I think the only one who will hear any difference is a dog.....:o) ! This part works great, sounds great. Steve
steve  Oct 02, 2018
A
Yes, it will limit the frequency, but your not going to be able to hear the frequencies that will be filtered out, most people only hear in that 20hz to 20khz range anyway.
coty  Oct 02, 2018
Q
i installed an aux to my xm radio and can hear alot of engine rpm noise will this fix it? and how would i install it?
connor  Oct 11, 2016
1 answer
A
it worked for me. i installed an after market radio and ended up with alternator whine. this installs between you head unit and the speakers. i put phono plugs on my left. and right speaker outputs and plugged into this unit...
don  Oct 13, 2016
Q
can I hook the pac SNI ground loop to my equalizer rca jack instead of the head unit rca jack? would that matter?
goldie  Sep 29, 2016
1 answer
A
Yes, you can also plug the PAC SNI-1 into your equalizer's RCA output instead of the head unit if ground loop noise is occurring from the EQ. I hope that helps! My bio: http://www.crutchfield.com/Support/Bio.aspx?bio=159
david  Oct 05, 2016 (Staff)
Q
How to stop these from killing the bass and all of the sound clarity from my speakers?
joel  Sep 14, 2016
1 answer
A
This product does not have any audio controls other than weather you connect the brown wires or not. You may want to look into sound processors to help restore the bass. Those are good about reducing the noise floor in the audio itself so they should help with that part too. I recommend calling an advisor on 1-800-324-9695 to discuss those products. HTH! My Bio: http://www.crutchfield.com/Support/Bio.aspx?bio=101
jason  Sep 19, 2016 (Staff)
Q
I'm using this with a Bose sound system equipped with a Kicx KAP-29 amplifier. The role of this additional amp is this system is to have a more kicking bass in the trunk. The main problem was the start/stop popping noise which has been eliminated by this stuff. But i'm suffering from a considerable level drop in bass after installing this. What could cause this problem and in which cases do i have to use grounding wire on it?
tamas  Mar 11, 2016
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/.
kristina  Mar 13, 2016 (Staff)
Q
Will sound quality be affected?
calvis  Dec 14, 2015
1 answer
A
When installed properly, no; not negatively anyway. Sound quality should only improve once the ground loop noise is eliminated. Hope that helps!
ryan  Dec 17, 2015 (Staff)
Q
Will this thing address loud popping sound heard from all speakers under the following conditions? 1. changing of audio source 2. changing volume from 1 to 0 or 0 to1 3. forward from one song/folder to next (both in CD and USB) 4. powering HD on and off 5. seeking up or down FM stations
tony  May 03, 2015
1 answer
A
I forwarded your question to an Advisor and they responded with the following: The PAC SNI-1 will eliminate interference and noise of all kinds that is created from a ground loop problem. If you are running an amplifier or amplifiers then this is the best solution in most cases for eliminating the noises that you have mentioned. Some cars with factory amps, like Mustangs for example need a 12V to 5V converter instead. If you would like to discuss further you can contact an Advisor directly by phone (1-800-324-9695) or online chat.
kristina  May 11, 2015 (Staff)
Q
If I have two sets of pre amps, can I use only one of these? Thanks for any info. Jon
jonathan  Mar 17, 2015
4 answers
A
I have a monoblock running my 12 and a 4channel running my door and rear deck I started by unplugging the RCAs from the amp to see which pair would eliminate the sound once I found it installed only one and all noise was gone hope this helps I know it helped me
rene  Mar 30, 2016
A
No you need two.
reid  Mar 18, 2015
A
Sorry, I just realized what this was. You need one for each amp. In my case, the amp would sense no signal when I changed channels and would turn off. Then when the stereo started playing the new channel it would turn back on. Huge noise problem changing channels. This filter delays the the signal from disappearing so the amp doesn't turn off and you will want one for each amp. So yes, each amp needs it's own filter. Worth the money!
kenneth  Mar 18, 2015
A
I had only one amp for two sub speakers. I would think you would need one for each amp with a red/white right/left for each amp But you could split it as a low input. My setup was for rear bass only. You may be able to use only one as a low input to two subs. I would refer to the wire diagram that came with your equipment.
kenneth  Mar 18, 2015
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