Question about Kenwood KFCM6925ie 6x9 3-way 200-watt Car Speakers Car Speaker

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I would like to know what the best way is to cut out bass response in 4x6 and 6x9 speakers in a car w/o having to install a 4ch amp running in HPF mode. any suggestions?. i read about small inline capacitors but i haven't the slightest idea what one i would need or how to connect them. any help would be appreciated :)

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  • GRNDMSTR Feb 06, 2010

    Will this setup work w/o an amp? currently they are being fed thru the factory wiring coming off the headunit.

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You can indeed do this by putting a ceramic capacitor inline with the speaker wiring.
The circuit you have now goes Amp+ to Speaker+, Speaker- to Amp-
putting a capacitor inline means your circuit will go:
Amp+ to Capacitor, Capacitor to Speaker+, Speaker- to Amp-
Ceramic capacitors don't have a + or - side.

The next question is what value of capacitor do you want, and that answer depends on two things -- how much bass you want to cut off (the cutoff frequency) and the impedance of your car speakers (generally 4 ohm, but some are 8 ohm and some are 2 ohm)

Here's a spiffy chart that shows the relationship between cutoff frequency and capacitance. There's a lot of data there. If you get overwhelmed, here's a suggestion:
Assume you have 4ohm speakers, and you want to cut out everything that's going to a subwoofer (120Hz and below) -- you want a capacitor of about 330 uF (microfarad)

You can get those at any radio shack, or order online from someplace like Mouser.com

Posted on Feb 05, 2010

  • Rob C Feb 06, 2010

    Yes, you bet.




  • lfsanderson
    lfsanderson May 16, 2012

    Yeah... or you could be untechnical and turn on the high pass filter LoL!! my old headunit has it as a setting.. my new one doesn't... but every EXTERNAL amp will have the option... lol

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