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DAC+ ADC Pro no phono input

Isaac Beale

January 26, 2024 03:13

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Forgive me as I'm new to all of this. 

I recently purchased a DAC+ ADC Pro and I'm attempting to follow this guide to airplay from a turntable. https://github.com/owntone/owntone-server/wiki/Making-an-Analog-In-to-Airplay-RPi-Transmitter#notes-for-hifiberry-dacadc-pro 

My setup uses an orbit basic turntable with a built-in pre-amp and I can verify that I get audio from the turntable with powered speakers. However when I use the phono inputs on the DAC+ ADC Pro and run `arecord -D hw:CARD=sndrpihifiberry,DEV=0 -f cd -d 0 -t raw  > /home/pi/music/AUX` to write to a file read by owntone following the guide, I just get quiet static noise.

Just out of curiosity, I tried the aux input and played music from my laptop into the pi, and I successully was able to stream music using the same arecord command. Any tips on what I'm doing wrong?

A few notable outputs

pi@raspberrypi:~/music $ arecord -L
null
    Discard all samples (playback) or generate zero samples (capture)
default
hw:CARD=sndrpihifiberry,DEV=0
    snd_rpi_hifiberry_dacplusadcpro, HiFiBerry DAC+ADC PRO HiFi multicodec-0
    Direct hardware device without any conversions
plughw:CARD=sndrpihifiberry,DEV=0
    snd_rpi_hifiberry_dacplusadcpro, HiFiBerry DAC+ADC PRO HiFi multicodec-0
    Hardware device with all software conversions
sysdefault:CARD=sndrpihifiberry
    snd_rpi_hifiberry_dacplusadcpro, HiFiBerry DAC+ADC PRO HiFi multicodec-0
    Default Audio Device
dsnoop:CARD=sndrpihifiberry,DEV=0
    snd_rpi_hifiberry_dacplusadcpro, HiFiBerry DAC+ADC PRO HiFi multicodec-0
    Direct sample snooping device

pi@raspberrypi:~/music $ grep -vE '#' /boot/config.txt

dtparam=i2s=on
camera_auto_detect=1
display_auto_detect=1
auto_initramfs=1
dtoverlay=vc4-kms-v3d,noaudio
max_framebuffers=2
disable_fw_kms_setup=1
arm_64bit=1
disable_overscan=1
arm_boost=1
dtoverlay=i2s-mmap
[cm4]
otg_mode=1
[all]
dtoverlay=hifiberry-dacplusadcpro,slave,leds_off=true

pi@raspberrypi:~ $ uname -r
6.1.74-v8+

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5 comments

• 0
  
  HiFiBerry team January 26, 2024 07:56

  What specifically do you mean by "Phono input" and "AUX input"? The input connector is the phone jack. THE RCA jacks are the output.

• 0
  
  Isaac Beale January 26, 2024 13:10

  Well... there it is! IM the problem. I was using the RCA jacks as input on the adc. Thank you so much for the prompt response!

• 0
  
  Eda Mobile March 19, 2024 02:30

  I'm stuck with a similar issue:  phono input to LMS running on piCorePlayer that also sits on a multi-piCorePlayer install that is already running with a dedicated LMS server.

  I've got the physical connections correct (using the phone jack for phono input from my turntable).

   

  piCorePlayer version: 8.2.0
   - LMS component activated

  I created a Favorite in piCorePlayer's LMS:  (not my original Linux LMS server!)

       File Format: WaveInput

       Bitrate: CD

       URL: wavin:default

  tc@pCP--LRoom:/$ arecord -L
  null
      Discard all samples (playback) or generate zero samples (capture)
  default
  plugequal
  equal
  hw:CARD=sndrpihifiberry,DEV=0
      snd_rpi_hifiberry_dacplusadcpro, HiFiBerry DAC+ADC Pro HiFi multicodec-0
      Direct hardware device without any conversions
  plughw:CARD=sndrpihifiberry,DEV=0
      snd_rpi_hifiberry_dacplusadcpro, HiFiBerry DAC+ADC Pro HiFi multicodec-0
      Hardware device with all software conversions
  sysdefault:CARD=sndrpihifiberry
      snd_rpi_hifiberry_dacplusadcpro, HiFiBerry DAC+ADC Pro HiFi multicodec-0
      Default Audio Device
  dsnoop:CARD=sndrpihifiberry,DEV=0
      snd_rpi_hifiberry_dacplusadcpro, HiFiBerry DAC+ADC Pro HiFi multicodec-0
      Direct sample snooping device

  Tried many things but cannot get output from the turntable through the HAT.  Note: It is confirmed that my piCorePlayer is linked to its own "internal" LMS when I'm trying to play albums.  Also confirmed: When linked back to my regular LMS on the LAN, stored media, Radio, etc all work correctly via the HAT.

  Any help would be greatly appreciated.

   

• 0
  
  HiFiBerry team March 19, 2024 05:46

  I can't say a lot about LMS, but the problem most likely is caused by a player already using the sound card. Both input and output are running full synchronously. That means they need to use exactly the same sample rate and sample format. Having two independent things trying to use the same card therefore usually won't work except you can configure these to use the same settings (or use some audio middlewar like PulseAudio)

• 0
  
  Eda Mobile March 26, 2024 00:52

  Ok. So I got it...with caveats....working via the following:

  1. Disable WAV input plugin on Logitech Media Server (LMS) running on my Ubuntu Linux server.
  2.  Disable the second network instance of LMS which was running alongside PiCorePlayer (PCP) on the Pi bearing the DAC+ADC
  2. Created a favorite in LMS, linked to the PCP / DAC+ADC Pro HAT combo as follows:
  Favorite URL = http://192.168.0.5:9100/S32_LE/44100/2/F   (ip address of PCP/DAC+ADC)
  3.  Place carefully curated LP on turntable and lower needle.  :-)
  4.  Choose the newly created favorite via the LMS app or LMS web GUI.
  5.  Voila: LP streams on whichever PiCorePlayers are selected and/or grouped.
  
  Still to fix:  Streaming works but output volume on the PCP/DAC+ADC node needs to be cranked way up vs other audio sources on the LMS server such as ripped CD's, Internet radio streams, etc.   I have no clue yet why the output is so low compared to the other server resources.  Even worse, if I bypass the Pi / DAC+ADC combo kit and connect the turntable directly to the powered speakers, output at the same speaker volume setting is almost ruinous.