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Class D Switching Power Amplifiers and Power D/A conversion

TPA325x vs Full Digital Amp (FX502SPro vs D802C)
TPA325x vs Full Digital Amp (FX502SPro vs D802C)
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Old 28th January 2018, 03:35 PM   #1
forestsgump is offline forestsgump
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Default Analog Pre-stage+Class D TPA325x vs Full Digital Amp (Alientek D8,I.AM.D V200, D802C)

Recent TPA325x seems deliver better SQ for Class D.
However FDA has being around for quite awhile, though not gaining much traction.

Rather amateur to audiophile amps, appreciate some thoughts from veteran audiophiles on China-made:

Compare SQ (put aside rated power), presuming digital source music~
eg. Analog Pre-stage Power Class D (FX502Spro - TPA3250)
vs FDA (STA326 - D802C/Alientek D8, TAS5342A - SMSL Q5 Pro, I.AM.D TAS5614)

Last edited by forestsgump; 1st February 2018 at 01:32 PM. Reason: for readability
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Old 31st January 2018, 01:04 AM   #2
forestsgump is offline forestsgump
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Bump-up
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Old 31st January 2018, 01:38 AM   #3
forestsgump is offline forestsgump
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Another draw attention pt. is TPA325x 0.005% THD vs FDA eg. STA326 0.05% THD

Some argue that THD below 1% or even 0.1% is not human perceivable, such the above point be muted?
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Old 31st January 2018, 07:39 AM   #4
chermann is offline chermann  Austria
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Quote:
Originally Posted by forestsgump View Post
Another draw attention pt. is TPA325x 0.005% THD vs FDA eg. STA326 0.05% THD

Some argue that THD below 1% or even 0.1% is not human perceivable, such the above point be muted?
Sorry ...listening tests i canīt provide you.
my understanding: the new Ti boards working with PFFB = closed loop
so the get better THD over a lot of measurments

http://www.ti.com/lit/an/slaa788/slaa788.pdf

The STA family chips are open loop chips, so without feedback.

i have listened to my refurbished harman kardon HS200 (STA508) and to my HS500 (DDX2160) chips over stereo mode. this sound clear and for me with a very tight bass...for me a little bit too less bass. its possible to set this by GUI in e.g. + 2dB ....+3dB more bass

for me the ordering over china to try something out is not as good as amazon. but no amp with TPA3250 is available
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