[Solved] Equalizer

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[Solved] Equalizer

Postby sciguy54 » Sat Jan 17 2015 01:12

This process works perfectly for me also... thanks for the details that finally got it working after a few months of fiddling around with this!

One of my biggest frustrations was simply getting the install to work. I found that I had to update my /etc/sources.list file to look like this:

deb http://archive.raspbian.org/raspbian jessie main contrib non-free
deb-src http://archive.raspbian.org/raspbian jessie main contrib non-free
deb http://repo.volumio.org/apt/ jessie main contrib

then do:

apt-get update
apt-get install libasound2-plugin-equal

BTW, make sure to restart mpd after any changes to asound.conf or mpd.conf:

sudo service mpd restart (ignore the warning about "share" if you get it)


I now have 3 Volumio wireless renderers and a fourth Pi with an external hard drive running Raspian and smb hardwired to my router as NAS. Everything works like a charm, but the equalizer is the final piece that makes it all special!
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[Solved] Equalizer

Postby mithrandir86 » Fri Jan 30 2015 14:30

Can anybody tell me about the performance impact of enabling alsaequal? I plan to create a streaming box with HiFiBerry DAC+ that should be able to handle 24/192 FLAC with enabled equalizer. Will this work or is the Raspberry PI too slow for this?
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[Solved] Equalizer

Postby colabra » Sun Feb 08 2015 21:21

Hi Guys
Tanks a lot. It work perfectly!

Just a question.... anyone knows how to change the frequency of each of the graphic bands?...could be even better if we chose the frequency and the Bandwith.
Thanks again

hope i get your answers soon

cheers
jh
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[Solved] Equalizer

Postby sciguy54 » Wed Feb 11 2015 03:57

I do not believe there is an easy way to adjust the center frequencies. It is a basic EQ, but at least provides 10 octaves which is surprisingly useful. There are some nuances to using the EQ as explained here:

http://linux.die.net/man/1/alsamixer

For instance, it is possible to control the comparative loudness of the left-right channels of a selected octave:

Q-W-E respectively increase volume for the left-combined-right channels in the selected octave
Z-X-C respectively decrease volume for the left-combined-right channels in the selected octave

These make more sense when you look at a qwerty keyboard and watch the mixer react to your keystrokes. Its very useful for me in one asymmetrical room layout I must work with.
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[Solved] Equalizer

Postby vodor » Tue Jun 09 2015 20:21

Thanks to this post and some other custom script with presets for amixer. I managed to hack together some PHP, HTML, custom MPD.conf and Asound.conf and some sudo magic to build a web interface that integrates into Volumio to give you equalizer preset buttons from the index page.

If anybody is interested drop me a message and I will see if I can document a howto.

Update: You can get a quick and dirty howto on my blog at http://goo.gl/Wxz0vz

Be warned I am not a coder so there may be flaws in my code but its something I hacked together quickly and it works for me.

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[Solved] Equalizer

Postby balbuze » Wed Jun 10 2015 19:32

Well done !
Where does values used in different setting come from ? Homemade ?
Even if I wouldn't have use the main page to display the eq it's a good tweak ;)
+1 for the Howto !!! :D
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[Solved] Equalizer

Postby sciguy54 » Thu Jul 30 2015 18:57

I just found this today. Thanks for the huge contribution Vodor! I can't wait to go back and digest all that you have done.
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[Solved] Equalizer

Postby erotavlas » Thu Oct 01 2015 20:35

vodor wrote:Thanks to this post and some other custom script with presets for amixer. I managed to hack together some PHP, HTML, custom MPD.conf and Asound.conf and some sudo magic to build a web interface that integrates into Volumio to give you equalizer preset buttons from the index page.

If anybody is interested drop me a message and I will see if I can document a howto.

Update: You can get a quick and dirty howto on my blog at http://goo.gl/Wxz0vz

Be warned I am not a coder so there may be flaws in my code but its something I hacked together quickly and it works for me.

Image


Hi vodor,
it is a very good job :). I'm looking for implementing more or less the same thing with pulseaudio instead of alsamixer. Have you already tried with pulseaudio? I know that there is a GUI written in python for pulseaudio and debian-like OS https://wiki.freedesktop.org/www/Softwa ... Equalizer/.
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[Solved] Equalizer

Postby acousticmood » Fri Oct 02 2015 17:10

This looks awesome. I wonder what are the chances of having this part of V-2?
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[Solved] Equalizer

Postby Zinck » Sun Oct 04 2015 21:58

I hope so. I have Pi 2 with a Pi-DAC + and after following all the steps in tom1502's guide volumio simply refuses to play anything.
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