Hi Cubii, thank you for the reply.

Up to now I skipped the "buttons" topic, because the speaker casing was
without the buttons. 
I am sure that someone will buy your internals on ebay, you have to be
patient. I found your offer on ebay and think that 70€ is a little bit
high considering that you get a complete speaker for 99€ at IKEA, incl.
die Wifi antennas, buttons, power adapter, which is not included in your
offer...

In regard of my installation it is working now!
One problem was, that I had to switch the left and right channel.
Obviously I connected the drivers the wrong way round to the Amp
terminals. Instead of switching the wires in the case I changed the
asound.conf. This is the part I changed (at the end of the file)
From:

Code:
--------------------
    
  ttable {
  2.0 0.5 # Mix stereo low signal to mono (mid-range)
  3.0 0.5
  4.1 0.5 # Mix stereo high signal to mono (tweeter)
  5.1 0.5
  }
--------------------

To:

Code:
--------------------
    
  ttable {
  2.1 0.5 # Mix stereo low signal to mono (mid-range)
  3.1 0.5
  4.0 0.5 # Mix stereo high signal to mono (tweeter)
  5.0 0.5
  }
--------------------


To answer my previous questions:
    
- Do I need to modify the asound.conf? No, not needed. The one from
  the tutorial should work.
- Can I use the pre-compiled extension rt-plugins for pCP 8.2.0? Yes.
- How can I check that the extension is working? Still don't know
  that.
- Was is right to activate the ladspa extension? No, this is not
  necessary. I de-activated it.
  

I also activated the "ALSA 10 band Equalizer" in Tweaks -> Audio tweaks.
Not sure if I did that before...

I wish everyone a Merry Christmas. Thanks for the support.

I case someone is in need of it I attached the files from
https://www.linux-magazine.com/Issues/2020/239/Rasp-Pi-Symfonisk

39547

Jörg


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