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DAC2 HD pop noise when powered on/off

Peter Ganzhorn

March 06, 2022 13:54

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Hi, I have a Hifiberry DAC2 HD that causes a very loud pop noise when powered on and off. I'm using a Pi 3 B+. This happens with an external amplifier and also with the Aamp60 hat with a Meanwell 18V 60W PSU connected to the DC input of the Aamp60. I also have an AMP2 that does not cause any pop sounds when powered on or off with the same PSU and speakers. If I connect the speakers after powering on the Pi (or turn on the external amplifier later than the Pi) there is no pop. Did anyone else have this kind of issue with the DAC2 HD? What can I do to avoid these pops? Best regards, Peter

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6 comments

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  P. Martin June 24, 2022 18:56

  Amplifiers and speaker pop are well documented in the world of audio. It's my understanding that your pop comes from the amp, and it reflects the conditions on its input.  If you kill the power suddenly to the HiFiBerry, you set the conditions for a pop to occur by creating irregular voltages on the Amp inputs that have nothing to do with the HiFiBerry's ability to run correctly.

  I don't follow the concept that the Berry is responsible for anything once you kill the power, but things are rarely binary So there is a grey area ofc, and the amp hat complicates things.  But I thought I'd mention this is the nature of amps.

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  Rob April 28, 2024 18:00

  Did you find a solution?

  I get the same problem with the DAC2 HD on a Pi4 running piCorePlayer plugged into a good quality power amp (which is already powered up). There is a very loud crack when powering the Pi up or shutting its power off (which piCorePlayer is designed to be able to handle).

  Some pop is acceptable, but this is very loud and not acceptable. I have plenty of other gear, none of which makes a crack as loud as the DAC2 HD. Any ideas anyone? Otherwise I'll be sending it back!

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  Neuman Ben April 29, 2024 18:19

  I too am getting pops. In my case, it occurs quite often but not always when I skip to next queued song.

  

  Edited by Neuman Ben April 29, 2024 18:20
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  Anton April 29, 2024 23:35

  I think sadly all the HiFiBerry DAC's do have this issue. I have tried

  • Dac+
  • Dac2 HD
  • Dac2 Pro
  • Dac+ ADC Pro

  .. and all of them had these "pop" issues when shifting bitrates / songs, and starting or turning off the pi.

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  Rob April 30, 2024 07:56

  Thanks, but it's not the little pops when changing bitrate that bothers me. It is the very LOUD crack when powering up or down. I also have a DAC+DSP and this doesn't have the problem on the analog output. I contacted HifiBerry support and they didn't have any ideas other than to send it back. They say it isn't a design issue, personalty I think it is taking to account their other DACs (DAC+DSP, DAC2 Pro) don't do it.

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  LVaszar May 01, 2024 02:06

  I had consistent loud pops w/ DAC2 HD + DSP and could not find a solution (Volumio OS on Rpi4). Ended up abandoning the Hifiberry. No pops on the exact same Rpi4. This makes me think the problem lies not in the Raspberry.

  Edited by LVaszar May 01, 2024 02:08