In Reply to: using capacitors to stop loudspeaker distortion posted by Andrew on 06/08/00 at 5:21 PM:
: Does anyone know what mathematical formulae, or know from experience, how i can make a high-pass filter for my car stereo.
: let me explain....
: i have 2 tweeters in the front, a set of 100w 6x9's in the back parcel shelf, and a 12 inch amplified sub-woofer in the trunk. Because the sub is alot more powerful, when i turn up the volume, the 6x9's distort, as too much bass is going to them. i therfore want to make a high pass filter with a cut of, off maybe 100 to 500 Hz.
You need what is known in the audio world as a cross over. This can be either and active device or purely passive ( i.e. capacitors, inductors ) device.
Unfortunately, there is no simple formula for designing same. You need to know the characteristic impedance of the speakers in question at a range of
frequencies in order to get it right. Most users do not have the necessary gear to make this measurement properly.
Ask the dealer where you bought this stuff about crossovers.