Overview

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.

KEEP READING

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:

Bass Blockers owner's manual

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

Reviews

Loading reviews...

Bass Blockers reviews

Average review:

135 reviews

Filter by rating

Customer photos

Customer provided image, click to load a larger version.

Verified customer

Verified employee review

Reviewed on Samsung.com

This review was collected as part of a promotion

Pros:

Cons:

Have questions for

Crutchfield response

<< >>

Details

Researched by Crutchfield's 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.

Accessories

Loading accessories...

17 questions already asked

how many is required per speaker?

[ JUNE May 15, 2017 ]

2 answers

One per speaker.

[ JAMES R. May 16, 2017 ]

One

[ WILLIAM S. May 15, 2017 ]

On the 150 Hz bass blocker would it work good with my Pyle x 6.5 inch midwoofers?

[ Mason Nov 03, 2016 ]

2 answers

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 ]

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

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.

[ KENNETH Apr 22, 2016 ] Staff

is the 150 hz size blocker correct for a Pioneer TS-A6886R on a high powered system?

[ David Apr 07, 2016 ]

1 answer

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 ]

Would these be necessary for a pair of Kicker 40CS654 speakers?

[ JEFFREY Mar 24, 2016 ]

1 answer

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.

[ KENNETH Mar 25, 2016 ] Staff

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

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.

[ KRISTINA May 12, 2015 ] Staff

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

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 Aug 22, 2014 ] Staff

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

[ stephen Mar 24, 2017 ]

1 answer

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 ]

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

[ KRISTINA Mar 17, 2017 ] Staff

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

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 ]

How do I determine the positive terminal on my speaker?

[ Michael E. Aug 22, 2017 ]

2 answers

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 ]

The positive terminal on your speaker will be marked with a + symbol.

[ DABNEY R Aug 22, 2017 ]

Will installing these keep my 3 1\2s from popping when bass/volume is up?

[ Jason Jan 08, 2017 ]

2 answers

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 ]

Yes, they should stop the popping. It worked for me.

[ James Jan 09, 2017 ]

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

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 ]

[ Thomas Jun 24, 2016 ]

no unless you are using multible drivers on same channel.

[ Thomas Jun 24, 2016 ]

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

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 ]

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

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 ]

What is the best blocker for a 2 ohms 1 inch tweeter?

[ 2ohms Feb 03, 2014 ]

2 answers

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

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

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 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 ]

SHOW MORESHOW LESS

Articles

Loading articles...

Our Top Picks

Buying guides

How-to guides

Videos

All finished with your chat session?

Thank you. You are in line to receive a call from .

It's your turn. will be calling you shortly at .

Bass Blockers

Pairs (150 Hz cut-off)

Since 1974

Free lifetime tech support

60-day price protection

About the Bass Blockers

What's in the box:

Featured review

Customer reviews

Bass Blockers reviews

Filter by rating

Customer photos

More details on the Bass Blockers

Product Research

Features

Customer Q&A

17 questions already asked

Rafael

Harold

Thomas

Chris

Stephen

Mario

Zachary

Tobin

Kent

Jackson

Terry

Raju

Your Advisor