Sonic Impact Output Filtering Mods???


Disabled Account
2004-06-14 4:57 am
I know of all the famous mods done to these little wonder amp, but I can't seem to find any information on the values of the output filter caps. Is there a schemetic available? Has anyone done any mods to the output filtering by removing uneccessary caps or upgrading the caps? Thanks so much for your time in this matter, Kevin.


diyAudio Moderator Emeritus
2005-01-17 5:29 am
I haven't seen anyone remove unnecessary caps other than the differential output cap. What I thought was interesting about that is that the Tripath datasheets say to use a 0.01uF cap but the stock SI's use a 0.15uF cap. I've tried it with both and thought it sounded a little brighter with the 0.01uF cap. I couldn't really tell a difference between the 0.01uF and no output cap.

Other than that, the Tripath datasheet for the TA2024 and TA2021B tell you what values to make the output capacitors for 4 and 8 ohm loads. They say to use 0.47uF for 4 ohms and 0.22uF for 8 ohms. You could also change the output inductors to change the cutoff frequency and the filter Q according to the equations in the datasheet (just the regular ones for a 12dB/oct lowpass filter).

I haven't felt the need to experiment because I like how the AMP3 sounds stock :) and I haven't experimented further on the SI because the AMP3 sounds better :D