Does this crossover work only with 6" and 6 1/2" speakers (as said)? what does the speaker size have to do with blocking certain frequencies?

No it will 'work' with any speaker size. The size of the speaker has more to do with the amount of air it can move and, generally, the amount power it can handle (all things being equal). Typically, a larger speaker has more cone area than a small speaker and can move more air--thus can respond more faithfully to lower frequencies. For example, it's typical to see 6.5" respond within a -3 db limit down to 60 hertz. A 3.5" speaker typically responds down to ~ 120 hertz within those same limits. Also, typically, the power handling capabilities of a speaker has more to do with the voice coil's ability to disappate heat (power). The voice coil is that little round thing in the middle of your speaker glued to the cone in the center, extending into the magnet structure, and covered by a dust cap. Dome drivers (typically tweeters) are driven by a voice coil around the perimeter of the dome. The bigger the voice coil, typically, the better it can disappate heat (power). Larger drivers can have larger voice coils (but they don't HAVE to).The reason you would buy a capacitor is you are limiting the lowest frequencies that can pass to your speaker through 'capacitance'. By limiting the lower frequencies, you can effectively reduce the amount of energy (power) the speaker's voice coil can receive, and protect it from overheating (blowing). The different capacitance values expressed in microfarads (uF) change the frequency at which the speaker received signal (power). But a capacitor can only roll-off that power at 6db per octave. So if I bought a capacitor for a 600hz crossover point, it would be 6 decibels down at 300 hertz, 12 decibels down at 150 hertz, etc.The sellers labeling of the capacitor as for 6.5", 5.5", 4" or 3.5" speakers is based on typicalness for size, power handling, and frequency response for the respective speaker....not any precise science. Also be sure to note the impedance (expressed in ohms) of the speaker and the capacitor's crossover point at that impedance meet your needs. Typically, car speakers between 3.5 and 6.75" are 4 ohms, but can be as low as 2 ohms, and as high as 8 ohms. Hope this is helpful!

Can these handle 100watts ? I have a separate sub , so I want only light mids and highs for my door speakers

I would say yes. The wires coming off of them are a pretty thick gauge.

Could I use theses with jl c2-350x speakers on a jk with a jl amp and kenwood headunit?

what you would need would be the bass blockers designed for the 3.5" speakers.

Does anyone know if there is a rated power these can handle, im thinking of using these on an amplifier that has about 250 watts @ 4 ohms, bass wise

These bass blockers are designed for a speaker application . Manufacturer specs these at 50 watts RMS.

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Reviews

A**R

Thank you

24.04.2025

T**.

Perfect for tuning your mids

After upgrading my 6.5 midbass and tweeters my factory 4 inch mids were out of their league. The only 4 ohm, 4 inch speakers I could find that were narrow enough to fit the doors of my Jetta Sportwagen clipped badly in the 500-800hz range, but there was a huge hole in my soundstage without them.These bass blockers solved that! The 4's don't clip anymore, even at the highest volumes I'll ever get close to. Rock music, singer/songwriter, vocal, and classic/old school music sounds absolutely amazing now, better than I've ever heard in a car. Heavy guitar riffs have more presence and vocals sound more full. 100% worth the low price.

25.08.2022

Z**K

They block bass

They block a bit too much for my needs so now I have a gap between the sub and the main speakers

31.10.2023

E**!

These do more than just block bass!!

These change the sound completely in my 2015 gmc sierra. The factory GM Siriusxm sounds like completel trash in the trucks. These bass blockers eliminated the bass and changed the frequency making the factory Xm sound like it supposed to. I also upgraded all door speakers to Focal Audio. If you Google Sirius and xm radio sound difference you will see that Xm has their frequency set to a lower setting than Sirius. Yes, they merged companies but GM still uses "XM" tuners. Ford uses "Sirius" tuners and theirs sound very good from factory. Xm now sounds soo crisp! Extremely satisfied,!

2.06.2020

P**M

Works great!

I originally got the 300hz version for my 4in front speakers in my bronco. I swapped them out for these 600hz ones and the sound is better and cleaner. Very pleased. Oh and btw - these things are UNI-directional when doing install. I had to call PAC to make sure.

29.08.2022

F**Y

Works very well

I used these in my 2015 toyota tundra 1794 with the factory Jbl system. They worked great on the rear speakers but they didn't work at ALL for the front. Reason being, the front door speakers are sub only I found out and these just basically shut them off with just a little static crackle noise.That was not a problem with these though. They work exactly as they should as long as the signal going to your speaker is a full range signal.

19.02.2020

R**Y

They really did a fine job.

The tweeters sound amazing. These separated the lower frequencies and brought the higher ones alive. The tweeters are crisp and clear.

15.06.2023

J**C

Easy Installation

Eliminated the rattle from my rear door speakers. Now I need to supplement my system with an underseat woofer to complete the task.

5.01.2022

Mounting Type	Integrated (Vehicle)
Material	Plastic Or Metal
Model Name	BB 2PR
Speaker Type	Multimedia
Compatible Devices	Desktop, Laptop, MP3 Player, Projector, Smartphone, Tablet, Television
Subwoofer Diameter	6 Inches
Unit Count	1.0 Count
Surround Sound Channel Configuration	2.0
Color	Green
Included Components	(2) Bass Blocker
Product Dimensions	6"D x 4"W x 7"H
Item Weight	1.4 Ounces
Impedance	4 Ohm
Is Waterproof	FALSE
Warranty Type	Limited
Number of Items	1
Control Method	Touch
Speaker Size	6 Inches
Power Source	Corded Electric
Woofer Diameter	6 Inches
Customer Package Type	Standard Packaging
Audio Driver Type	Dynamic Driver
Audio Driver Size	6.5 Inches
Subwoofer Connectivity Technology	Wired
UPC	606523108331
Global Trade Identification Number	00606523108331
Manufacturer	PAC
Shape	rectangular prism
Item Weight	1.4 ounces
Item model number	BB-2PR
Is Discontinued By Manufacturer	No
Warranty	1 YR Manufacture

PAC BB-2PR Pair of Bass Blocker Designed for 6" Speakers, Green

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