Convert stereo Speaker Level to mono Speaker Level?

I tried to Google this but all I found was line level information.
I am working on a DIY project and need some info.
Have a small digital amp board that outputs stereo signal speaker wires.
And have a single full range driver.
Should I expect trouble if I connect both speaker level power wires to the speaker at the same time?
I'm guessing it'll be fine, will just change the impedance level and the single speaker will play both left & right signals.
But I don't think I've ever done this before and am making things complicated in my head.

I know most amps can take the (+) from one channel and the (-) from the second channel to a single speaker which will do a summed mono. But that's with a mono line level signal being fed to the amp.

Why?
For a single speaker DIY portable speaker project I'm considering.
Dual speakers is looking tough to fit and a single speaker would really be interesting.
 

rayma

Member
2011-04-29 8:37 pm
Have a small digital amp board that outputs stereo signal speaker wires. And have a single full range driver.
I know most amps can take the (+) from one channel and the (-) from the second channel to a single speaker
which will do a summed mono. But that's with a mono line level signal being fed to the amp.

Yes, wire the speaker in this manner. Then you need to passively sum the two channels at the amplifier inputs.
To do this, add in series with each source channel a resistor ~5k. Connect the outputs of the resistors together,
and then connect this point to both amplifier inputs for mono. Also connect the source and input grounds.

Don't try to parallel the amplifier outputs.
 
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