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Bass Blockers

Pairs (150 Hz cut-off)

Item # 127BB150A2

If you like it loud, protect your speakers from bass distortion and enjoy cleaner sound with Bass Blockers.

If you like it loud, protect your speakers from bass distortion and enjoy cleaner sound with Bass Blockers.

Discontinued item
17 questions - 34 answers

Item # 127BB150A2

About 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.

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
MFR #BB-150A2

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More details on the Bass Blockers

Mark G.

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.

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Customer Q&A

17 questions already asked

Q
how many is required per speaker?
[ neil  May 15, 2017 ]
2 answers
A
One per speaker.
[ JAMES R.  May 16, 2017 ]
A
One
[ William S.  May 15, 2017 ]
Q
On the 150 Hz bass blocker would it work good with my Pyle x 6.5 inch midwoofers?
[ Mason  Nov 03, 2016 ]
2 answers
A
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 ]
A
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 ]
Q
I have a 2015 Accord Sport which came with 4 stock speakers. I want to add 2 tweeters from the EX-L model. Is this the right product I need to buy? Am I going to connect the tweeter indirectly to the front speaker via this bass blocker?
[ Long  Apr 22, 2016 ]
1 answer
A
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
Q
is the 150 hz size blocker correct for a Pioneer TS-A6886R on a high powered system?
[ Thore  Apr 07, 2016 ]
1 answer
A
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 ]
Q
Would these be necessary for a pair of Kicker 40CS654 speakers?
[ Jeff  Mar 24, 2016 ]
1 answer
A
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
Q
Hello, I have several Qs: 1. I have 2 component speakers on the doors and two 6 X 9 3-way speaker and a sub, do I need bass blockers even though I am using a sub? 2. What if RMS to the speakers goes above 50 watts?, will this damage the bass blocker? 3. According to the speaker sizes I detailed in Q #2, what "size" (frequency) bass blockers, in case I need them, do you recommend? Thanks
[ Dante  May 08, 2015 ]
1 answer
A
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
Q
I installed this product on all four of my factory speakers, per instructions, on the + side of each speaker. They do a great job of blocking low frequencies. But I now hear a small popping sound when head unit is turned on & slight static at higher volumes. Remedies?
[ Daniel  Aug 21, 2014 ]
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  Aug 22, 2014 ]  Staff
Q
What would you recommend for 4 kenwood kfc 1665s? They get alittle distorted when cranked up on a stock head unit. I also have a 12 inch sub to take care of bass. Thanks
[ Steve  Mar 24, 2017 ]
1 answer
A
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 ]
Q
I have two pairs of Pioneer TSG6845R 6x8" on my Mazda 6 powered by the head unit, and a Rockford fosgate p300-12 powered enclosure, in getting a lot of bass through the speakers when pumping up the volume and a lot of distortion because of it, what would be the best cut out frequency for these speakers? Thanks for your help.
[ Julian  Mar 15, 2017 ]
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  Mar 17, 2017 ]  Staff
Q
Im running Kenwood KFC1065R 4in speakers in the dash of my 54 Chevy truck, what would be the correct Hz cutoff Bass Blocker should I run? Roger
[ Roger  Dec 04, 2016 ]
1 answer
A
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 ]
Q
How do I determine the positive terminal on my speaker?
[ mike  Aug 22, 2017 ]
2 answers
A
If it isn't blatantly identified, just make sure you hook all of them up on the same "Side" of the connector. Speakers that are passive will typically work either way. If you hook up one side (driver's vs. passenger's) opposite to the other you can create your own noise cancelling system though... the vibrations coming out of one will be the inverse of the other which when it hits your ear pushes and pulls at the same time, cancelling out the movement. Though, I wish they would just identify them all. the important part for these is the + side of the feed from the amp.
[ Scott  Aug 22, 2017 ]
A
The positive terminal on your speaker will be marked with a + symbol.
[ DABNEY R  Aug 22, 2017 ]
Q
Will installing these keep my 3 1\2s from popping when bass/volume is up?
[ Jason  Jan 08, 2017 ]
2 answers
A
It should. Also, some of the news head units allow you to input the speaker size and response cutoff for every speaker position. Take a look at the Kenwood head units. The last few cd tuners have had this feature and are very customizable. They really are less expensive than you would expect.
[ DABNEY R  Aug 22, 2017 ]
A
Yes, they should stop the popping. It worked for me.
[ James  Jan 09, 2017 ]
Q
Should I add these? I have a Pioneer MVH-X370BT 4 ohm x 4 channels using 4 JBL GX602, impedence 2.3 ohm speakers Power:60 Wms. 180 watt peak, frequency response 50Hz - 21kHz, sensetivity 92 bB @ 2.83V
[ mabd5160  Jun 23, 2016 ]
3 answers
A
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 ]
A
no
[ Thomas  Jun 24, 2016 ]
A
no unless you are using multible drivers on same channel.
[ Thomas  Jun 24, 2016 ]
Q
I have a set of Kicker 3.5" speakers an I want to eliminate the bass from them. Which frequency of bass blocker is recommended? I just want the highs to come through. Thx
[ Kevin  Jun 22, 2014 ]
4 answers
A
go with 1200/1500for tweeters and 500/800 for mids
[ Thomas  Jun 24, 2016 ]
A
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 ]
A
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 ]
A
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 ]
Q
Would these bass blockers be ideal for my alpine type R tweeters who's frequency range is from 1000 hz to 22000 hz?
[ Jorge  Apr 18, 2014 ]
2 answers
A
yes
[ Thomas  Jun 24, 2016 ]
A
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 ]
Q
What is the best blocker for a 2 ohms 1 inch tweeter?
[ 2ohms  Feb 03, 2014 ]
2 answers
A
depends on drivers low end freq cut off
[ Thomas  Jun 24, 2016 ]
A
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
Q
Would this cut-off frequency be ideal for tweeters? I don't want ANY mids or lows coming from them, only highs. Also, wondering if I really need them if I'm going to run them off my head unit. Can't I simply adjust the high pass crossover frequency in the deck and skip bass blockers? I've had a set of bass blockers in a previous system and they worked awesome! But I don't recall what frequency I chose back then. My current head unit is a Kenwood KDC-355U and my tweeters are Pioneer TS-1110's (chose Pioneers over Kenwoods for their higher frequency response). Any advice would be much appreciated. Thank you.
[ Kenwood Freak  Dec 21, 2013 ]
7 answers
A
1200/1500 hz cut off for tweets 500/800 for mids
[ Thomas  Jun 24, 2016 ]
A
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 ]
A
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 ]
A
Get the highest number...
[ Randy  Dec 22, 2013 ]
A
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 ]
A
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 ]
A
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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