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Article on Philips prototype digital amp
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Old 29th January 2004, 07:16 AM   #51
IVX is offline IVX  Russian Federation
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Join Date: Jul 2003
Location: south of China
It is still not 0.002%, but were dramatically improved THD & IMD performance 8938 amp
by resistors value reducing at 10 times (obviously, that caps was increase).
Almost at the clipping.. THD@1KHZ;4OHM;400KHZ are 0.045%, 5khz are 0.033%,
7khz are 0.028%, 10khz are 0.009%(22khz bandwidth and only 2
harmonic like AES17),
for -3db 1khz are 0.028%, 5khz are 0.02%, 7khz are 0.02, 10khz 0.015%.
IMD at 18khz vs 19khz for -3db are 0.02%, for -6db are 0.015%, for -10db are 0.013% too.
My previous choice of value for passive components
has been high sensitive for EMI products from itself.
And now i was trying listening it vs my old linear mosfet amp (200ma biased AB@0.003-0.005%THD;IMD=?).
Well.. different in sound does exist. If you just once used any "modulating" musical studio effect processing(LFO is OFF) like chorus, phaser etc, then you must can understand me exactly. I didn't know it earlier, but now in my old amplifier it seems there are 3-5 % of this effect.. New amp is haven't it. This is more possible to listen on the rich of harmonics sounds like human voices "AAH", violin etc, but this is almost not audible at like noise distribution -Hi hat, snare etc.
left channel is new , right is old amp.. after some time it reversed right to left etc.
Best regards,
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