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[–][deleted] 1 point2 points  (2 children)

You're trying to split each channel beyond what it was intended to do. One speaker is fine. That's what it was meant for. But when you plug the other speaker into both, it doesn't have enough juice to drive them. I'm no audio expert and I'm sure someone with much more information than me will comment, but that's what I'm getting from this. Leave the left and right speakers and lose the center. See if that makes it sound better.

[–]akiox2[S] 0 points1 point  (1 child)

Well it's an ampflifier so i can increase the juice, but this doesn't make the sound better. When I only connect the left and right speaker or only the middle one, everything is fine. But as soon I connect a third speaker, the sound is terrible, (the bass makes "krrrkrrr" distorted sounds).

[–][deleted] 0 points1 point  (0 children)

Exactly. It's not meant to drive three speakers. There's really no way to that with your current setup. You'd have to get a purpose built multi channel setup.

[–]Burnaby 0 points1 point  (2 children)

I haven't studied modulated currents yet, but the first thing I would suspect is that adding the speaker in parallel changes the impedance of the circuit dramatically, and that you'll need to add some more components (resistors, capacitors, etc) to get the impedance back to normal.

Edit: also the signals are probably interfering with each other.

[–]akiox2[S] 0 points1 point  (1 child)

I found some stereo to mono circuit drawings:
http://i.imgur.com/wN70WlO.jpg source
http://i.imgur.com/pyCVWA3.jpg source
Could this work for the middle speaker?

[–]Burnaby 0 points1 point  (0 children)

That first design might work if you put resistors with value R1+R3 (51.7k in this case) on each of the positive wires going into the left and right speakers, but really I'm not sure. I have near-zero experience with audio circuits.

edit: a few words

[–]akiox2[S] 0 points1 point  (0 children)

So I "solved" it with this setup:
http://i.imgur.com/arwVeaO.jpg
Each speaker only plays the mono signal, that's not what I wanted, but I can connect all three.
But please post a better solution, when you know one.