Amp question.

[cindychops]

After a bit of advice please,i have a denon pma720ae and it has 2 rows of speaker outputs for speakers A/B.I know i can bi-wire the speakers by connecting the top row to high input and the bottom row to low input and pressing A+B together.
What would happen if i connected both sets of outputs to a single speaker (like bridging) would i get 2x50watts into each channel or would there be no difference at all.So it would be 4 x speaker cable into 2 banana plugs into the speakers.
Just thought i may as well use the extra output as i'm only using 1 pair of speakers.
Bit weird but being in lockdown has that effect on me.

[TonyRPH]

It won't bridge the outputs in the scenario you describe.

Both sets of terminals for each channel are fed from the same amplifier, and are the same phase.

To enable bridging, you need two separate amplifiers (left and right) which are combined but out of phase.

You also need to invert the phase to one channel at the input.

So in your case, to bridge the amplifier would require a second PMA720 - and you would need to invert the phase to one channel on each amplifier.

[cindychops]

Thanks for the reply Tony,I had been using 2 NAD 214's bridged as i am downsizing (the NAD'S were big).I will just use the denon in normal stereo mode.