Sonic Impact Output Filtering Mods???

HolyGhostFire20 · 31st August 2005, 11:44 PM

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.

BWRX · 1st September 2005, 03:24 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

31st August 2005, 11:44 PM	#1
HolyGhostFire20 Account Disabled Join Date: Jun 2004 Location: Indiana	Sonic Impact Output Filtering Mods??? 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.

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1st September 2005, 03:24 AM	#2
BWRX diyAudio Moderator Emeritus Join Date: Jan 2005 Location: Pennsylvania	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

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