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Bass Blockers

Pairs (800 Hz cut-off)

127 Reviews | 16 questions - 31 answers

Item # 127BB800A2

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Overview

Our take on the Bass Blockers

If you like it loud, protect your speakers from bass distortion and enjoy cleaner sound with Bass Blockers. Each Bass Blocker handles up to 50 watts RMS with a 6 dB per octave roll-off. You'll find some general guidelines below for matching Bass Blockers to speaker size. For smaller speakers (3-1/2"s, 4"x6"s, 4"s), the 600 Hz Bass Blockers work well with low-powered systems, while the 800 Hz Blockers are a better choice for high-power applications.

If you like it loud, protect your speakers from bass distortion and enjoy cleaner sound with Bass Blockers. Each Bass Blocker handles up to 50 watts RMS with a 6 dB per octave roll-off. You'll find some general guidelines below for matching Bass Blockers to speaker size. For smaller speakers (3-1/2"s, 4"x6"s, 4"s), the 600 Hz Bass Blockers work well with low-powered systems, while the 800 Hz Blockers are a better choice for high-power applications.

Speaker Size Cut-off Frequency

6-1/2", 5"x7"/6"x8" — 150 Hz
5", 5-1/4" — 300 Hz
3-1/2", 4", 4"x6" — 600 Hz (low power)
3-1/2", 4", 4"x6" — 800 Hz (high power)

These models come fitted with easy-to-use quick-slide connectors that make installation a cinch. There's no splicing or crimping — just slide one of the Bass Blocker's connectors onto your Crutchfield speaker harness and the other Bass Blocker connector onto your speaker's positive terminal.

Cut-off points are at 4 ohms. If you use 8-ohm speakers, the cut-off point is half the listed frequency.

Note: The .250" spade terminals on these Bass Blockers won't connect to the terminals on some car speakers and many speaker harness adapters (such as Metra speaker adapters). If your speakers or harness adapter use a different terminal, we recommend that you buy a 10-pack of female quick slides to splice on the Bass Blockers.

Did exactly what I was hoping. No more bass on my infinity 3 1/2 speakers

Doug, STRASBURG IL

What's in the Box:

  • 2 Bass Blockers with 6" speaker wire at each end (terminated with a 1/4" female slide connector on one end and a male slide connector on the other)
  • Instructions
Reviews

Bass Blockers Reviews

Average Customer Review(s):

(127 Reviews)
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Hands-on research

Product Research

Features

Overview: Bass Blockers stop speaker distortion caused by excessive bass relative to a speaker's bass output capability. They are especially useful with small diameter speakers and tweeters. Bass Blockers are typically installed right before the positive speaker input terminal, in-line with the positive speaker lead.

Easy Installation: To install a Bass Blocker, slip the female connector of the bass blocker onto the positive speaker terminal, and plug the male connector into the speaker lead. If you don't want to use the terminals, cut them off, cut the speaker lead at a convenient location close to the speaker, then splice the Bass Blocker into the positive speaker lead and insulate the connections. Bass blockers are not directional, so the orientation of the Bass Blockers on the positive speaker leads is not important.

Note: The .250" spade terminals on these Bass Blockers won't connect to the terminals on some car speakers and many speaker harness adapters (such as Metra speaker adapters). If your speakers or harness adapter use a different terminal, we recommend that you buy a 10-pack of female quick slides to splice on the Bass Blockers.

Slope: The roll off rate is 6dB/octave, and the frequency each bass blocker is rated for (i.e. 150, 300, 600, 800Hz, etc.) is the point where response has been lowered by 3dB.

Model 2 ohms 4 ohms 8 ohms Wire Color
127BB150A2 300Hz 150Hz 75Hz Brown
127BB300A2 600Hz 300Hz 150Hz Blue
127BB600A2 1200Hz 600Hz 300Hz Green
127BB800A2 1600Hz 800Hz 400Hz Yellow

Power Handling: Each Bass Blocker is capable of handling up to 50 watts RMS.

Our Product Research Team

At Crutchfield, you'll get detailed, accurate information that's hard to find elsewhere. That's because we have our own in-house Product Research team. They verify what’s in the box, check the owner's manual, and record dimensions, features and specs. We stay on top of new products and technologies to help people make informed choices.

Q & A

Customer Q&A

Crutchfield asked  
Why did you buy this?

bass is for big speakers...... other stuff is for small. having the proper freq to the proper speaker is the key to SQ. don't skimp on your setup [ Matthew  Jun 16, 2017 ]
Bought a subwoofer and wanted my coaxial speakers to perform better. [ Mike  Jun 06, 2017 ]
I'm running my 6.5" door speakers from the factory head unit, and using a line out converter (from my rear speaker wires) to run a sub amp. I don't need strong bass from my door speakers, and a -6 db/octave slope from 150hz is gradual enough to make a smooth transition with the low pass crossover on my sub amp. [ Flint  Jun 01, 2017 ]
you were out of stock on the 300 hz bass blockers so I just purchased the 150 hz for now. I just purchased a component JBL 6500 C from you so I wanted to prevent the woofers from distorting at a low frequency yet not cut off too much mid-bass frequency. [ Jed  May 30, 2017 ]
Suggestion from Rusty to limited bass frequencies to front speakers. [ DANIEL L  May 26, 2017 ]
To help save my 6.5 speakers for having too much bass on them.. [ Billy  Apr 25, 2017 ]
Rear fill speakers tend to reproduce lower frequencies better than front speakers on my older vehicles but they still need to have the lower ranges block so that only my subwoofer is handling them. [ Charles  Apr 20, 2017 ]
I'm adding a small subwoofer to handle the bass. These are supposed to make the mids and highs cleaner since the bass is filtered. [ V  Apr 01, 2017 ]
needed [ Bobby  Mar 19, 2017 ]
I had some 3 1/2 on an amplified circuit. I didn't want to damage the [ Lee  Feb 22, 2017 ]
To Protect my speakers. [ Kyle  Feb 11, 2017 ]
have sub, wanted to keep the doors from rattling [ Steven  Dec 31, 2016 ]
I'm adding 6 x 9's to the rear and want to avoid overdriving the 4" front speakers. I'm hoping the system will produce a richer sound. [ Brandon  Dec 18, 2016 ]
The were ordered to protect the door speakers when I add sub woofers to the existing system. [ Doug  Dec 06, 2016 ]
Existing speakers had capacitor inline for dash speakers and both sets of speakers are in parallel. Don't want to blow my stereo. [ Michael  Nov 11, 2016 ]
These bass blockers are perfect for door speakers and block all the unwanted low bass frequencies and allow the mids and highs through only. [ john  Oct 24, 2016 ]
Running a 2 channel amp to 4 speakers, needed a 150hz cutoff for the smaller front speakers [ VICTOR  Oct 01, 2016 ]
The wiring in my Ford F350 Sync/Mytouch is haywire, making it virtually impossible to use normal component crossovers. I am using these bass blockers to more-or-less emulate the crossover functionality. [ Cliff  Aug 29, 2016 ]
To use the max bass out if my factory sub without the interior speakers sounding like crap. [ Andrew  Jun 19, 2016 ]
To cut out bass distortion in my BOSS Phantom 6.5" speakers. [ Jonathan  Jun 12, 2016 ]
My rear doors only support a 4" speaker which is not really capable of full-range sound, and these will help to protect the rears from frequencies they just can't safely produce at moderate volumes. [ DANIEL J  May 29, 2016 ]
This is a simple and inexpensive way to stop sending extremely low frequencies to relatively weak factory speakers. Now that I am installing a powered subwoofer, I didn't want to dial out the low end on the head unit to avoid distorting the door speakers. This way the sub will get the full range of input and fill that void. I wasn't sure which cut-off to use but I expect that 150 Hz (the lowest available) will be better than nothing at all. [ Eric  May 15, 2016 ]
Tiny front speakers, no ability to control frequency from head unit, must have if you like to turn up the volume without distortion. [ Jeffrey  Apr 21, 2016 ]
The Bose speakers bottom out too easy [ BILL  Apr 20, 2016 ]
Interior speakers need help with low frequency response. [ S  Apr 19, 2016 ]
Comments on car forum suggested these. [ gary  Feb 18, 2016 ]
i chose theas so i can pump out more vocals since i have subbs [ william  Dec 05, 2015 ]
because its about to get funky [ Chuck  Apr 28, 2017 ]
I've used these before and they work great for cutting out distortion in door speakers that aren't built for low frequency reproduction. [ Charles  Apr 20, 2017 ]
4" 2way dash speakers / reinforcement speakers get "muddy" with full range bass being otherwise plumbed to other components [ Matthew  Mar 19, 2017 ]
Very good item to protect your audio tweeters or speakers from damaging them at the rated frequency [ michael  Mar 16, 2017 ]
Because I asked Allen and he had the solution to the issue I have with my speakers. I trust that he knows what he is talking about Thanks Allen [ ROBERT  Feb 25, 2017 ]
To Protect my new speakers. [ Kyle  Feb 11, 2017 ]
Need them for tweeters in my car [ VITALIY  Jan 29, 2017 ]
Great product that I have utilized in past installations. Keeps the bass where it belongs, coming from the subwoofers and not overworking the speakers in the doors/dash. [ Matthew  Jan 16, 2017 ]
I needed something to help cut down on the bass that went through my 6.5's. I went with the 300Hz cut-off so that all the unwanted low frequencies will not damage my speakers. [ Mark  Nov 02, 2016 ]
Will help keep the 3.5 IN. Sounding clear without bass coming into play too much. [ MATTHEW  Oct 28, 2016 ]
Too block the lower notes from my small 3 .5 inch speakers. [ Chad  Oct 03, 2016 ]
recommended by Speaker Tech [ Joseph  Sep 06, 2016 ]
Reliable way to easily prevent speaker damage. Been using them 25 years [ Richard  Sep 05, 2016 ]
I have Blaupunkt 5 1/4 in my car door. These little guys handle bass well, but I like my music LOUD. And it is going to kill them before I get my sub put in. Now that I'm ordering my sub I will give them break. [ Shannon  Aug 23, 2016 ]
I chose these to block to much bass when running off of after market deck. [ Sean  Jun 18, 2016 ]
Following the suggestions from the reviews. [ Fred  Jun 15, 2016 ]
Prior to seeing them here I understood the concept; but, did not know how to pick the right ones. Seems like a frugal form of protection with the prospect of exceptional clarity. Will write a review after install. Thx for providing the tech info and number of choices for different applications. [ Michael  May 30, 2016 ]
It was recommended by tech advisor, David David's Bio: http://www.crutchfield.com/Support/Bio.aspx?bio=22 [ James  May 01, 2016 ]
Thought it made good sense to block lower frequencies from 3.5" speakers I was replacing in the dash. [ Lee  Apr 22, 2016 ]
These are to be installed inline with 3-1/2" two-way speakers. The 300Hz threshold on these blockers will keep the frequencies at the speakers well above their 90Hz floor and out of their low-end roll-off curve. This all means the speakers should be free of any mechanical distortion at any sane power setting. [ KEITH  Apr 20, 2016 ]
It is an excellent way to keep your smaller speakers from trying to reproduce bass that they are not designed for. [ authur  Apr 11, 2016 ]
I am hiding a powered sub in my rv and want to cut the bass of to the four speakers in the living area. [ Darrin  Mar 30, 2016 ]
Recommended by advisor to reduce bass vibration in rear speakers [ Carl  Mar 25, 2016 ]
To install satellite speakers onto a vintage receiver's full range speaker output. The speaker manufacturer recommended 150hz @ 8 ohms. [ Franklin  Jan 19, 2016 ]
I used Chat to get a few technical answers and discuss options with a Crutchfield expert. He helped me narrow down the speakers I chose and then suggested I consider Base Blockers for the front speakers to help prevent distortion. As they were only $10 it was a no brainer. The tech had recommended 300Hz for my particular speaker even though the site said 600 hz for that size speaker in general. He said my speaker could handle the lower rating so 300 would serve me well. Thanks Crutchfield! [ David  Jan 06, 2016 ]
To protect my 3.5" dash speakers. Thanks..... [ Ray  Jun 11, 2017 ]
To keep the bass off the 3.5's [ Larry  May 15, 2017 ]
Give greater clarity to my speaker purchase [ Marcus  Apr 15, 2017 ]
I have purchased 4" polk speakers that perform very well for a speaker this size they just do not handle the low frequency at higher volume. At the suggestion of customer service on previous project that was similar to this one a 600hz bass block let these little speaks do what they are good at. [ Brian  Apr 08, 2017 ]
Don't need bass for tweeters [ Micah  Apr 06, 2017 ]
I am hooking up tweeters and your documentation on the website said they were ok for low powered systems. I talked with a tech person this afternoon who recommended them. [ Carolyn  Mar 18, 2017 ]
to take out some bass [ DeAndre  Feb 18, 2017 ]
Recommended by your tech for my small 3.5" car speakers [ Michael  Feb 12, 2017 ]
Just went off of what crutchfield recommended according to speaker size [ NOHE G.  Feb 06, 2017 ]
For 3.5 inch speakers [ Kevin  Feb 03, 2017 ]
To complete install of Alpine head unit and front 4X6 Kicker speakers. Recommended by Andy last & spec'd out by Troy today [ William  Nov 15, 2016 ]
so my little 3.5 dash speakers don't get blown through the windshield [ George  Nov 03, 2016 ]
The way I understood the application information it said for this size speaker the 600 Hz cut-off work best. [ J. R.  Nov 02, 2016 ]
Recommended by associate [ Stephen  Oct 06, 2016 ]
I bought the 300 Hz cut-off blockers and it doesn't sound right when running on head unit power. [ Sean  Oct 05, 2016 ]
Recommended in Jeep Renegade forum [ Christopher  Sep 30, 2016 ]
For 3.5 inch center Infinity Reference REF-3022cfx, in order to complement my Polk DB5251 [ Cliff  Aug 29, 2016 ]
It is a good alternative when you are not using a cross over. It will keeps the speakers sounding clear by blocking the lower bass signals they are not designed for. [ Thomas  Aug 28, 2016 ]
I chose bass blockers to limit the low frequencies of my 3 1/2s to avoid any potential crackling or popping noises.. [ Brian  Aug 18, 2016 ]
Buzz advised me that these speakers needed bass blockers. Buzz's Bio: http://www.crutchfield.com/Support/Bio.aspx?bio=53 [ Michael  Jul 21, 2016 ]
front speakers distort [ andrew  Jul 18, 2016 ]
Block bass from 3.5 dash speakers. [ Graham  Jun 23, 2016 ]
Too much power going to my 3 1/2 inch speakers [ Edward  Jun 08, 2016 ]
recommended by advisor [ Thomas  May 22, 2016 ]
A previous reviewer suggested this for small front speakers. [ William  May 20, 2016 ]
I purchased a used 2011 Dodge Ram 3500 w/ the Alpine system. The dash speakers buzz when playing music so I wanted to replace them with a good aftermarket speaker. I read about how bass frequencies can damage smaller speakers. To avoid this happening with the new speakers, I purchased the Bass Blockers from Crutchfield. [ Paul  May 18, 2016 ]
They were recommended, for proper operation. [ Miguel  May 07, 2016 ]
I'm running my 3.5s off a head unit with no crossover and they are distorted at high volume [ Bradley  Apr 30, 2016 ]
Makes 3 1/2" dash speakers work better [ REX  Apr 18, 2016 ]
Cut off all bass going to 3.5" speakers in the dash [ Jeff  Mar 12, 2016 ]
Because I bought 3 1/2 dash speakers and it good to run them with that small of a speaker. [ Michael S.  Jan 23, 2016 ]
My 3.5" kickers were distorting when I turn the volume up, this will fix that so I can crank up the volume a bit more. [ Kodi  Jan 08, 2016 ]
per recommendation of your rep. I wanted to block base in the dash speakers of my daughter's Camaro [ Robert  Jan 05, 2016 ]
To avoid damaging the new speakers, or overloading them with low frequency. [ Christopher  Dec 25, 2015 ]
For my 3 1/2 dash speakers [ Brian  May 20, 2017 ]
needed for tweeters [ R  May 15, 2017 ]
tweeter protection. [ JIMI  Apr 03, 2017 ]
Looking for components to lmprove sound quality. [ Leonard  Apr 02, 2017 ]
They were required [ KIPPLIN R  Feb 16, 2017 ]
Chuck recommended these for the 3.5 inch dash speakers in my truck. Those speakers were causing a great deal of distortion in the system due to their small size and inability to handle low bass frequency. [ JASON A  Oct 20, 2016 ]
Installing aftermarket tweeters and don't want them adversely effecting them. [ Timothy  May 21, 2016 ]
To cutout bass and stop distortion. [ Arthur  May 01, 2016 ]
Replacing front door woofers due to one being blown. Factory tweeter was connected through high-frequency filter mounted on factory woofer. Having to install these with new woofers for that reason. [ Jason  Apr 18, 2016 ]
run 3.5 dash speakers with deck power only. Have sub with amp and 6x9 speakers with amp just wanted to use deck power on dash without killing them with lows [ MARK  Apr 11, 2016 ]
These coils will "cut-off" the lower frequencies, because 4 X 6 speakers do not put out a lot of bass. I think that these Bass Blockers, at this frequency will prolong the life of the speakers too. [ James  Feb 28, 2016 ]
For dash 3.5'' powered by head unit only. [ greg  Feb 14, 2016 ]
Best range of options and clear descriptions of how these Bass Blockers work in different setups. Using these to dampen the bass on 3.5" Kickers going in the upper dash paired with 6x9 Kickers in the front doors (Kicker 5,25" in the rear). [ Christopher  Jan 15, 2016 ]
I picked 800 hertz because I purchased some 3.5" kicker speakers that wouldn't be able to reproduce anything lower without any distortion. [ ALBERT  Dec 24, 2015 ]

16 questions already asked

One per speaker. [ JAMES R.  May 16, 2017 ]
One [ W. Scott  May 15, 2017 ]
If you have a sub they work well helping to prevent you smaller speakers from trying to produce lower frequency's they are not capable of producing which in turn helps prevent them from blowing. [ Tammy  Nov 04, 2016 ]
If you plan on using these for the highs, absolutely. I have them on some pioneers in my 05 xB, and sounds great. [ Craig  Nov 04, 2016 ]
For additional details on fit or installation please contact an Advisor by phone (1-800-324-9695) or online chat. They will be able to pull up your vehicle and give you the details on the connections and what you will need for an installation in your vehicle. [ Kenny  Apr 22, 2016 ]  Staff
Yes, however, they've been reviewed to have great low frequency response. Even though they should be large enough to perform well with a 150 Hz cap, I'd go with the 300 Hz instead. Let the subs take care of the bass. [ Nicholas  Apr 07, 2016 ]
This will depend largely on your vehicle and your set up. For details on installation please contact an Advisor by phone (1-800-324-9695) or online chat. They will be able to pull up your vehicle and give you the details on what you will need for an installation. [ Kenny  Mar 25, 2016 ]  Staff
I forwarded your question to an Advisor and they responded with the following: The components should be using a crossover which will eliminate the highs from the tweeters. We don't carry any bass blockers for the 6x9's. Usually the frequency range on that size speaker can accomodate plenty of bass and does not need a blocker. So you do not need bass blockers for either location. If you would like to discuss further you can contact an Advisor directly by phone (1-800-324-9695) or online chat. [ Krissy  May 12, 2015 ]  Staff
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  Aug 22, 2014 ]  Staff
This worked great for me when I kept blowing 3 1/2" speakers but it may cut out a little too much for a full range speakers. Cheap enough to give it a shot though. [ JAHVIN  Mar 24, 2017 ]
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  Mar 17, 2017 ]  Staff
I personally would cut off anything below 5000 Hz 5kH. It may say it can play it...but I wouldn't. [ James  Dec 06, 2016 ]
Yes, they should stop the popping. It worked for me. [ James  Jan 09, 2017 ]
I dont know too much details about audio. I have a alpine head unit running 3.5in jl that distorted. I put these blocks on them and it went away. Have had them for a good while and still work. Hope that answered your question [ Ben  Jun 27, 2016 ]
no [ Thomas  Jun 24, 2016 ]
no unless you are using multible drivers on same channel. [ Thomas  Jun 24, 2016 ]
go with 1200/1500for tweeters and 500/800 for mids [ Thomas  Jun 24, 2016 ]
the 800s will do fine but if you have a hi pass crossover built in your amp or radio use it to as well [ THEODORE  Jun 28, 2014 ]
The 800hz blockers will work fine. I don't know about the Kickers, but check before you buy the blockers because some smaller diameter speakers come with blockers already installed at the factory so buying another set isn't required. [ JOHN  Jun 23, 2014 ]
I used the 800hz and they sound good but honestly, if you're using an aftermarket head unit then you can probably get away with the 600. Just a thought. [ OCTAVIO  Jun 23, 2014 ]
yes [ Thomas  Jun 24, 2016 ]
They will work fine, just be sure that they don't already come with bass blockers (some speakers do). Also, if you're using a crossover network, bass blockers aren't necessary, because the crossover handles that chore. [ JOHN  Apr 19, 2014 ]
depends on drivers low end freq cut off [ Thomas  Jun 24, 2016 ]
We have not received any answers from other customers on your question. I would recommend reaching out to an Advisor by phone (1-800-324-9695) or online chat. They should be able to help answer your question. [ Jeff  Feb 05, 2014 ]  Staff
1200/1500 hz cut off for tweets 500/800 for mids [ Thomas  Jun 24, 2016 ]
I used them on my tweeters and they work well. I have no amps or anything simply the head unit and I get a great sound. [ JOEL  Dec 30, 2013 ]
Bass blockers are used to prevent the lowest frequencies from going thru tweeters. Because tweeters reproduce the high-end sounds in the frequency spectrum, trying to get them to reproduce bass level sounds could damage them and the sound will be distorted. I think you are confusing the equalization curves in your deck with a cross over network which must be installed in the speaker line from a separate amp. (You don;t say whether you're using a separate amp or not). Frequencies above 800hz are still considered "mids" so the bass blockers won;t stop the tweeters from receiving those frequencies but they will prevent distortion and damage to the tweeters. If you are using component speakers (woofers, mid range and tweeters and again, you didn't say), they should have a cross over network installed which should correctly separate the frequencies to match the capabilities of that particular brand of speaker so the bass blockers wouldn't be necessary. [ JOHN  Dec 22, 2013 ]
Get the highest number... [ RANDY  Dec 22, 2013 ]
I'm running them on the 3.5 inch polk audio speakes but I have 6x9 in my doors so I also wanted to block out any lows. I was also trying to limit the distortion . [ MARK L  Dec 22, 2013 ]
It was the best ting I did for my tweeds. They are ear piercing highs now. The cross over on my punch amps was still letting some mids through. For the price it is worth it. [ RANDY  Dec 22, 2013 ]
I picked up a set of polk audio silk dome tweeters to put in my dash, and i used these bass blockers in the wiring. They've been in for around 4 mnths, and seem to be doing tye job pretty well. Hope that helps. [ JOSHUA  Dec 21, 2013 ]
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