Class d amplifier rail capacitors

Which sound better ?

  • LOW ESR capacitors

    Votes: 9 81.8%

  • Regular linear psu capacitors

    Votes: 2 18.2%
  • Total voters
    11
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T

Tekko

Banned
Joined 2004
LOW ESR vs regular electrolytics. Not the main bulk storage in the PSU side but rather the smaller ones on the amp board next to the power fets.

From a HF design standpoint low esr caps rated for smps output duty should be used, but sound quality might object.

Which sound better ?
 
gmarsh

gmarsh

Member
Joined 2004
It's pretty easy to calculate the amount of ripple current that rail capacitors in a class D amp are subjected to - it's a lot. Use low ESR parts, it'll save you blown capacitors and a lot of grief.

A class D amplifier *is* a switching power supply, just with a modulated output voltage. All the good design practices associated with SMPS design are applicable to class D amplifier design.

As for "what sounds better", that depends on so many things to predict with any degree of confidence.
 
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