Bridge multiple audio amp outputs?

[kgray9]

Hi all!

I made a 4x channel 40W (per channel) audio amplifier based on the E-TDA7386. It works amazingly! But I am wondering if I can bridge the outputs together on all 4 channels to create 1x 160W output? Is this even possible? Or maybe I could bridge the right and left channels to create 2x 80W?

Attached is the circuit and PCB top and bottom.

Thanks in advance!


EDIT: I am trying to run a 100W subwoofer temporarily on it.
EDIT2: Apologies for the rough schematic. FYI, the audio input caps are 100nF.

 

[JMFahey]

Those 4 outputs are already bridged, each of them.
So: no.

You might use 2 in parallel to drive half the load impedance but I´d rather get a proper higher power amplifier.

 

[kgray9]

Those 4 outputs are already bridged, each of them.
So: no.

You might use 2 in parallel to drive half the load impedance but I´d rather get a proper higher power amplifier.

Thanks JMFahey.

I do have two of them. How would I set it up? Hook up the left and right input channels of each together, and then...


EDIT: I have two subwoofers. One 50W 8Ω and one 4 terminal 100W 4Ω.

 

[kgray9]

Question answered here:
https://forum.arduino.cc/t/bridge-outputs-on-audio-amp/952129/28

SOLVED!