Been looking into this as it would be nice to have a system wide solution to provide equalization to the sound output.
My setup uses a Suptronics X5000 I2S DAC. I’ve proceeded to install the alsaeq modules (following the step-by-step procedure outlined here). I also needed to manually install the alsa-utils and alsamixer in order to get the required UI and the command-line utilities.
I did not have a /etc/asound.conf file, so I created one and entered these values:
pcm.!default {
type plug
slave.pcm plugequal;
}
ctl.!default {
type hw card 0
}
ctl.equal {
type equal;
}
pcm.plugequal {
type equal;
slave.pcm "plughw:0,0";
}
pcm.equal {
type plug;
slave.pcm plugequal;
}
(again, following the procedures outlined in the above referenced page)
So when I issue the aplay -l command (from alsa-utils), I get this:
**** List of PLAYBACK Hardware Devices ****
card 0: sndrpihifiberry [snd_rpi_hifiberry_dac], device 0: HifiBerry DAC HiFi pcm5102a-hifi-0 []
Subdevices: 0/1
Subdevice #0: subdevice #0
Moving on to calling the UI utility via alsamixer -D equal command, I get this “semi-graphical” UI with a 10-band slider adjustment:
lqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqq AlsaMixer v1.0.28 qqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqk
x Card: Eq10 F1: Help x
x Chip: alsaequal F2: System information x
x View: F3:[Playback] F4: Capture F5: All F6: Select sound card x
x Item: 01. 31 Hz Esc: Exit x
x x
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x lqqk lqqk lqqk lqqk lqqk lqqk lqqk lqqk lqqk lqqk x
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x 66<>66 66<>66 66<>66 66<>66 66<>66 66<>66 66<>66 66<>66 66<>66 66<>66 x
x <01. 31 Hz >02. 63 Hz 03. 125 Hz 04. 250 Hz 05. 500 Hz 06. 1 kHz 07. 2 kHz 08. 4 kHz 09. 8 kHz 10. 16 kHz x
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However, moving the sliders makes absolutely no difference in my Hifiberry-based audio DAC. I suspected that maybe it has to do with telling the alsa drivers to pass through audio from the Pi to the DAC card (as a sink? Sorry - I’m using fancy words that I don’t fully understand here). So I pressed F6 and it greeted me with the sound card selection screen:
lqqqqqq Sound Card qqqqqqk
x- (default) x
x0 snd_rpi_hifiberry_dacx
x enter device name... x
mqqqqqqqqqqqqqqqqqqqqqqqqj
Upon selecting the snd_rpi_hifiberry_dac device and hitting Enter, I then get: This sound device does not have any controls.
I wonder if there is anything else in terms of editing configuration files in order to insert the alsaeq into the alsa audio-chain on OSMC (to plug in between the audio fed from the Pi to the DAC)? I’m not an expert in commanding Linux distros (more of a Windows mouse pilot myself) so I’d very much appreciate anything that could point me to the right direction.
Thanks in advance.