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From: Kevin McMurtrie
Subject: Re: How to lower audio amp freq response?
User-Agent: MT-NewsWatcher/3.2 (PPC Mac OS X)
Date: Sat, 21 Dec 2002 04:14:55 GMT
NNTP-Posting-Date: Fri, 20 Dec 2002 20:14:55 PST
In article ,
Peter Nielsen wrote:
>What is involved in lowering the frequency response of an
>off-the-shelf car audio power amplifier?
>An example of how component values must be changed would be very
>How close to DC is it possible to go?
>I am not trying to "make" a sub woofer amp. I still need as high a
>frequency response as possible to remain intact.
It wouldn't be easy. You'd need to change:
Most bypass capacitors on virtual signal grounds (if not true split
AFC low pass capacitors in FM tuner.
Most coupling capacitors.
Power amplifier boostrap capacitors.
To go from 50 Hz to 25Hz, you'd have to double the capacitance. In some
cases there won't be room for a larger capacitor.
Good car stereo amps already hit 20Hz with no problem. They use
bootstrap power to drive the power transistors so they'll never do a
good job at subsonic frequencies. Maybe you want to buy a power op-amp
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