[SOLVED] Equalizer

SOLVED!

I was having the same problem as many: the equalizer just would not work with my HiFiBerry AMP+. After much web research and testing, I found the problem is in the alsa config file (/etc/asound.conf). Here’s how to fix the problem:

To find out what sound cards you have on your system, display the contents of /proc/asound/cards:

`$ cat /proc/asound/cards
0 [ALSA ]: bcm2835 – bcm2835 ALSA
bcm2835 ALSA
1 [sndrpihifiberry]: snd_rpi_hifiber – snd_rpi_hifiberry_amp
snd_rpi_hifiberry_amp`

Here you can see my HifiBerry Amp+ is seen as card 1. However the ALSA configuration file (/etc/asound.conf) is pointing to card 0, the default card:

$ cat /etc/asound.conf
ctl.!default {
    type hw
    card 0
}
pcm.equal {
    type plug;
    slave.pcm plugequal;
}
ctl.equal {
   type equal;
   module "Eq10";
}

pcm.plugequal {
   type equal;
   module "Eq10";
   slave {
     pcm "plughw:0,0";
   }
   hint {show on;description "Equalizer for plughw:0,0"}

To fix the problem, you need to change all references in /etc/asound.conf from card 0 to your card (1, in my case). Here is my corrected /etc/asound.conf:

$ cat /etc/asound.conf
ctl.!default {
    type hw
    card 1
}
pcm.equal {
    type plug;
    slave.pcm plugequal;
}
ctl.equal {
   type equal;
   module "Eq10";
}

pcm.plugequal {
   type equal;
   module "Eq10";
   slave {
     pcm "plughw:1,0";
   }
   hint {show on;description "Equalizer for plughw:1,0"}

Now reboot your machine, then go into the Max2Play Audio Player->Advanced Configuration. Change the Sound Card to „plugequal – Equalizer for plughw:1,0“. I also changed my ALSA Parameters to „80:::“ and the Command Line Options to „-r 44100-48000 -u hL::::“.

Save everything, reboot again, and you should be good to go.

Warning: I have a very basic system; just a stock RPi2 and a HiFiBerry AMP+. If your system has additional hardware or a different amp/DAC, your mileage may vary, but the basic approach should get you where you need to go.

Hope this works as well for everyone!

• This reply was modified 8 years, 5 months ago by HandyGuy.

Marc, did you manage to get the equalizer to work? Ive tried all sorts but with no success.

cheers
Peter

@petefilltir

try to erase anything entered in the commandline and try the use the equalizer.

Regards,
Mohammad Mbydeen

@ petefilltir

Have you tried to burn new image, which sound card do you have?

Regards,
Mohammad Mbydeen

HandyGuy …

Thanks – perfect solution!

I have 4 Raspi w/HiFiBerry cards of different types and your solution worked for them all.
So simple … the solution is independent of sound card type. I wonder if it works for bluetooth speakers as well?????

Again, thank you for taking the time to post and help others.

Bob

Hi HandyGuy

Thank you for your information and we appreciate your willingness to help others on this forum.

Best Regards,
Mohammad Mbydeen

I still have issues.
Even altering the asound.conf to show „1“ ; the option in the drop down is still 0 🙁

The HandyGuy /etc/asound.conf fix works perfectly, but it overwritten every time I restart the RasPi.

How can I make the changes permanent?

Yes, i did