jfo wrote: 
> Is this the correct approach? Here are the last few parts of the config
> file...
> 
> #dtoverlay=iqaudio-dac#dtoverlay=iqaudio-dacplus#disable_audio_dither=1
> 
> If it's correct the hiss is still present after reboot.

Hi jfo,

You need a proper text editor.

The last line should be:

disable_audio_dither=1

It should look something like this:

Code:
--------------------
    # For more options and information see
  # http://www.raspberrypi.org/documentation/configuration/config-txt.md
  # Some settings may impact device functionality. See link above for details
  
  initramfs piCore3187m_v7.gz followkernel
  
  # uncomment if you get no picture on HDMI for a default "safe" mode
  #hdmi_safe=1
  
  # uncomment this if your display has a black border of unused pixels visible
  # and your display can output without overscan
  #disable_overscan=1
  
  # uncomment the following to adjust overscan. Use positive numbers if console
  # goes off screen, and negative if there is too much border
  #overscan_left=16
  #overscan_right=16
  #overscan_top=16
  #overscan_bottom=16
  
  # uncomment to force a console size. By default it will be display's size 
minus
  # overscan.
  #framebuffer_width=1280
  #framebuffer_height=720
  
  # uncomment if hdmi display is not detected and composite is being output
  
  # uncomment to force a specific HDMI mode (this will force VGA)
  #hdmi_group=1
  #hdmi_mode=1
  hdmi_force_mode=1
  
  # uncomment to force a HDMI mode rather than DVI. This can make audio work in
  # DMT (computer monitor) modes
  
  # uncomment to increase signal to HDMI, if you have interference, blanking, or
  # no display
  #config_hdmi_boost=4
  
  # uncomment for composite PAL
  #sdtv_mode=2
  
  #uncomment to overclock the arm. 700 MHz is the default.
  arm_freq=700
  core_freq=250
  sdram_freq=400
  force_turbo=1
  
  device_tree=
  #dtoverlay=hifiberry-dac
  #dtoverlay=hifiberry-amp
  #dtoverlay=hifiberry-dacplus
  #dtoverlay=hifiberry-digi
  #dtoverlay=iqaudio-dac
  #dtoverlay=iqaudio-dacplus
  
  disable_audio_dither=1
--------------------


regards
Greg


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