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AMP2 Anti-clipping?

James Harper

November 30, 2020 11:45

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Hi,

I'm wondering if the AMP2 has any anti-clipping/soft clipping feature?

I notice in these a couple of posts (https://support.hifiberry.com/hc/en-us/community/posts/360008648705-Amp2-vs-beocreate- & https://support.hifiberry.com/hc/en-us/community/posts/360013336978-Amp2-and-JBL-XL1000-MKII-speakers) you mention that Class-D amplifiers behave differently when clipping. Do you have any more details on this difference?

I'm looking to run 2 ceiling speakers (86dB) to fill a 4m x 4m room and while it'll probably be fine, I'm just wondering what will happen to the speakers if the kids decide to max out the volume!

Thanks,

James

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2 comments

• 0
  
  HiFiBerry team November 30, 2020 11:55

  As Class-D amplifier have output filters that already filter very high frequencies, they clip a bit like old tube amplifiers. The problem that you see with "classic" Class-AB amplifiers is that you have very high energy in very high - and even inaudible - frequencies. With a Class-D amplifiers it's not that bad as frequencies above 22kHz are already filtered.
  However, if your kids running this at maximum volume in 4x4m their ears might be your bigger problem than the speakers. You might try limiting the maximum volume. We have a feature for this in HiFiBerryOS, but you can probably implement this also with other distributions.

• 0
  
  James Harper November 30, 2020 12:12

  Great, thanks for the fast response!

  One more question - why do NAD use soft-clipping on their class-D D3020's if they already have filters, is there any extra benefit?

  Thanks

  James

  Edited by James Harper November 30, 2020 12:13