Please note that there are now, from the Feb 2015 Raspbian releases, 3 volume controls for the Pi-
DAC+ / Pi-. This can be confusing but for simplicity just ensure that the Analogue and
Analoge Playback Boost volume controls are set to Maximum (100%)
•
“Digital” is the master volume control 0..100%
•
“Analogue” sets the maximum output to be 1vrms (0% = +0db) OR 2vrms (100% = +6db gain)
•
“Analogue Playback Boost” gives an additional gain of 0.8db and should similarly be set to 100%
Test that audio can be heard through the Pi-DAC+. Use the ALSA speaker-test utility and listen for
“Front Left / Front Right”. Make sure your volume level (Digital mixer above) is not at 100% before
doing this.
pi@raspberrypi ~ $ speaker-test -c 2 -t wav
Alternatively, listen to an internet based radio station
…
Notice the
hw
parameter which points to
device 0
,
subdevice 0
in the example below. Change these
values depending on the specific output of the
aplay –l
utility above.
pi@raspberrypi ~ $ mplayer -nolirc -ao alsa:device=hw=0,0 -playlist http://
network.absoluteradio.co.uk/core/audio/mp3/live.pls?service=vrhq
If you don’t have
mplayer
already installed then this can be done using:
pi@raspberrypi ~ $ sudo apt-get update
pi@raspberrypi ~ $ sudo apt-get install mplayer
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