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Crutchfield Bass Blockers

Pair of inline frequency filters (150 Hz cut-off)

Item # 007BB150

Protect your new car speakers from bass distortion and enjoy cleaner sound with Crutchfield's Bass Blockers.

Protect your new car speakers from bass distortion and enjoy cleaner sound with Crutchfield's Bass Blockers.

Top seller

Item # 007BB150

In stock

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About the Crutchfield Bass Blockers

Eliminate bass distortion in your speakers

Protect your new car speakers from bass distortion and enjoy cleaner sound with Crutchfield's Bass Blockers. Each Bass Blocker handles up to 50 watts RMS with a 6 dB per octave roll-off. Here are some general guidelines for matching Bass Blockers to speaker size.

Eliminate bass distortion in your speakers

Protect your new car speakers from bass distortion and enjoy cleaner sound with Crutchfield's Bass Blockers. Each Bass Blocker handles up to 50 watts RMS with a 6 dB per octave roll-off. Here are some general guidelines for matching Bass Blockers to speaker size.

Speaker Size Cut-off Frequency

6-1/2", 5"x7"/6"x8" — 150 Hz

5-1/4" — 300 Hz

3-1/2", 4", 4"x6" — 600 Hz

These models come fitted with easy-to-use quick-slide connectors that make installation a cinch — no splicing or crimping needed.

The listed cut-off points are at 4 ohms. If you use 8-ohm speakers, the cut-off point is half the listed frequency. If you use 2-ohm speakers, the cut-off point is double the listed frequency.

Note: You can connect these Bass Blockers in either direction, as the built-in capacitors are not polarized.

  • pair of inline high-pass filters (150 Hz cut-off)
  • handle up to 50 watts RMS
  • 6 dB per octave roll-off
  • warranty: 1 year
  • Our 60-day money-back guarantee
  • MFR # BASS-265

What's in the box:

  • Two 150Hz bass blockers (attached 6" speaker wires on either end terminated by male and female quick-slide connectors)

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Crutchfield Bass Blockers reviews

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Crutchfield response

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More details on the Crutchfield Bass Blockers

Mark G.
The Crutchfield Bass Blockers replaces these items:

Product Research


Bass Blockers: 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.

Crossover Point: The crossover point changes based on the speaker impedance.

Model 2 ohms 4 ohms 8 ohms
007BB150 300 Hz 150 Hz 75 Hz
007BB300 600 Hz 300 Hz 150 Hz
007BB600 1,200 Hz 600 Hz 300 Hz
007BB5000 10,000 Hz 5,000 Hz 2,500 Hz

Easy Installation: To install the Bass Blockers, slip the female connectors of the bass blocker onto the positive and negative speaker terminals of the new speaker, and plug the male connectors into the speaker wiring adapter harness' positive and negative leads. 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 and negative speaker leads and insulate the connections. Bass blockers are not directional, so the orientation of the Bass Blockers on the positive and negative speaker leads is not important. Polarity is important; the white wire is positive and the black wire is negative.

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Customer Q&A

16 questions already asked

I've been led to believe that the Volvo XC90 uses 8 ohm speakers wired in parallel, such that the amp 'sees' a 4 ohm system. In this configuration, is the bass blocker cutoff at the listed frequency, or half the listed frequency?
[ Rory  May 26, 2020 ]
2 answers
If you purchased the product from Crutchfield, feel free to contact our Tech Support team. 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.
[ Krissy  Jun 09, 2020 ]  Staff
The formula is f = 1 / (2*pi*R*C(in Farads)). If the load impedance is halved, the crossover frequency is doubled. However, most car speakers are rated 4 ohms, so if the capacitor is specified for a 4 ohm speaker, you will get 150Hz.
[ Seth J  May 26, 2020 ]
What gauge ? is the wire
[ Cole  Apr 17, 2020 ]
2 answers
Not 100% sure, but I think is either 18 or 20
[ Carlos  Apr 29, 2020 ]
18 gauge.
[ Elias  Apr 29, 2020 ]
Can I use these on an amplifier? I have the kenwood kac-m1824bt and it has no crossover feature. Thanks
[ Rommel  Mar 31, 2020 ]
1 answer
They're meant to attach to speaker. They work with amps, that's how i use them.
[ Brent  Mar 31, 2020 ]
Would these work for home speakers as well? I have a subwoofer using a line out and separate amp with a variable crossover up to 160 and want to block the bass for my standard speakers.
[ Duane  Dec 09, 2019 ]
2 answers
These are not recommended for use with home speakers.
[ Calvin  Jan 08, 2020 ]  Staff
Yes, but only if the impedance of the home speaker is 4 ohm. If you connect these to am 8 ohm speaker, the frequency where the bass block begins is doubled, so you'll miss out on midbass. Google "high pass crossover table" for a more detailed discussion.
[ Michael  Jan 06, 2020 ]
I need to block 80hz and below for my kicker ks series 6x9's. Which bass blocker do I need?
[ Dustin  Feb 26, 2019 ]
3 answers
Well crutchfield only has down to 150hz on blockers. If your set on 80 hz. Google 80hz bass blockers. Theirs 1 that is 80 hz. Parts express.
[ David Cook  Mar 01, 2019 ]
Maybe go higher than the 150's. I bought 2 pair however, after I put them in my front 6.5's I noticed that they didn't have any real effect so I never installed them in the rear.
[ Gary  Mar 01, 2019 ]
Hi, Dustin 6X9 is a good speaker and will handle good wattage, don't understand why do you want to use the speaker as a woofer.
[ Jose  Feb 26, 2019 ]
Can I use these bass blockers on speakers that are 110 rms?
[ Danny  Oct 15, 2018 ]
1 answer
I dont no write direct to crutchfield people to help.
[ victor  Oct 15, 2018 ]
Can I install these on 3 way kicker 6x9's?
[ Aaron  Apr 03, 2018 ]
4 answers
You can, but the 6x9s should be able to handle bass down to 60hz or so. I wouldn't use bass blockers on those unless you have something else to handle the lower frequencies. I use these on my dash speakers (3.5 inch) and let my 6x9s in the rear handle the bass.
[ Jeffery D.  Apr 04, 2018 ]
yes you can install them inline with a 3 way 6x9. However, if you do this, you will be limiting the performance of the mid and low range portion of the speaker. In most speaker set ups the bass blocker is used only in line with the tweeter, to limit the low range frequency from blowing the tweeter. Most Speakers designed for multiple ranges have individual limits in place for each of the ranges they cover. My suggestion would be to look at the specifications of the speakers you are looking at purchasing. Find out if they have built in limiters. If not, consider running a two way mid and low with a satellite tweeter.
[ mark  Apr 03, 2018 ]
Yes. But you wouldn't want to. It'll block all your bass and a lot of the midrange. I installed these on some little 3 inch full range dash speakers to get rid of the bass and such. They act like a kinda upper mid to high tweeter. With that being said. No, don't install them on 3 way speakers. Unless you wanna take 70% of your speakers capability away.
[ JAMES  Apr 03, 2018 ]
Of course
[ Phillip  Apr 03, 2018 ]
I didnt word my first question right. If i had bass blockers hooked up to a car speaker would i be able to tap into the same speaker and still get the line output converter to play bass for my aftermarket sub?
[ Jonte  Jan 26, 2018 ]
1 answer
It would be recommended to use a different speaker-level signal to your aftermarket sub/amp than the speakers you have connected to bass blockers. For more details or to discuss further, please contact an Advisor directly by phone (888.955.6000) or online chat. Thanks!
[ Larry  Feb 05, 2018 ]  Staff
I am going to get the Kicker 44KSC3504 in the dash and the doors are going to be 44KSC6504. Do I need these and what frequencies?
[ jared  Jan 26, 2018 ]
1 answer
Yes, if your dash and door speakers don't have a crossover. I used factory wiring so my dash speakers were getting the same signal as my door speakers. Installing the 150hz blockers made a positive difference in qualit of sound. I'm very glad I took this step.
[ Drew  Jan 31, 2018 ]
Can you use these with a line output converter hooked up to subwoofers?
[ Jonte  Jan 17, 2018 ]
4 answers
I don't think they are designed for use with a "line level" signal, They will cut the low end "< 150Hz" to an amplified signal. I use them to protect my smaller dash speakers from frequencies below their ability.
[ Brian  Jan 23, 2018 ]
you could but they block the bass frequency, so if you are hooked up to subwoofer then you will only get the high frequencies. not what you want for a sub.
[ BRIAN  Jan 22, 2018 ]
I can't see why not but why would you want to block low frequencies to a speaker designed for low frequencies? Btw, crutchfield has excellent support, give them a call and they'll get you set up right.
[ Phillip  Jan 22, 2018 ]
You can use these with any signal. However, be cautious to the speaker you are directing them to as they will affect the output. For example a 150hz bass blocker on a subwoofer would be pointless. But, if you use it for a 6.5" coaxial it would make sense. The point is to minimize low frequency extremes on smaller speakers to maximize output.
[ Rodrigo  Jan 22, 2018 ]
If my front tweeters are wired with my 2 Front Door Speakers, do I need to purchase another set for the front speakers and connect the set I already bought to the tweeter wires before they merge with the door speaker wiring?
[ Chris  Nov 23, 2019 ]
1 answer
These bass blockers should only be connected to your door speakers. They are not appropriate for protecting your tweeters from low frequencies. If your tweeters are factory equipment they should already have a passive crossover in place, so you only need the one set of bass blockers. If you have aftermarket tweeters you should use the supplied crossovers that came with the aftermarket tweeters and connect them to the door speakers.
[ Brian  Nov 23, 2019 ]
Can I use these bass blocker for a Kicker 4ohmns 2.75 dash speaker?
[ Jcmolina  Aug 03, 2020 ]
4 answers
I use them for a 3.5-inch dash speaker. Makes a world of difference. More of mid and highs, balancing out all 6 speakers in my ram 1500. Well worth it.
[ paul  Aug 03, 2020 ]
I used this for my dash speakers that are the same size but not kicker. They work great especially if your dash speakers are anything like mine are. They were super distorted before putting this product in.
[ Ruari  Aug 03, 2020 ]
Yes they will work well. I used them in line with my dash speakers. I cut the wires off the speaker harness that came with the order and soldered the bass blockers to the speaker harness.
[ DAVID  Aug 03, 2020 ]
Yes, that's what I used them for.
[ Philip  Aug 03, 2020 ]
i have JBL Club 3020 3-1/2" 2-way car speakers will these work better than the 270 microfarad capacitors that came with the speakers?
[ g  Mar 08, 2020 ]
1 answer
Thank you for your question. Using the included capacitors that come with the JBL Club's would be recommended, but depending on your overall need or sound performance, you may wish to use the Crutchfield Bass Blockers. Please chat with an Advisor online or by phone at 1-800-324-9695. We will be happy to go over your system, and help you decide on the best course of action.
[ Jess  Mar 24, 2020 ]  Staff
I have 2 speakers that are 4" but run at 8ohms. The other 2 are 4x6s and run at 4ohms. I see that these are rated at 600hz at 4ohms. What do you suggest I use for the speakers running at 8ohms?
[ SparkieV  Nov 10, 2018 ]
1 answer
You will want to contact an Advisor by phone (1-800-324-9695) or online chat to discuss the compatible options. They will be able to determine if everything will integrate and help you make the best decision for your system and your budget.
[ Kenny  Nov 17, 2018 ]  Staff

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