[scottmandue]

I work with some industrial/commercial rack mount audio amps, many of them you can flip a switch or add some jumpers to bridge a stereo amp into a mono.

Long story short, my little car has two speakers in the door and no more room to add any other speakers, but the head unit (in dash stereo) has front/back speaker output.

Would connecting the front/back channels together (to increase power output) be more that the little transistor inside the head unit and or the front/back fader circuitry can handle?

IF this could be done (Big if!)

Should it be done in series (positive to speaker, positive/negative from front/back connected, negative to speaker, done per side left/right).

Or parallel (both positives and both negatives connected together to speaker, per side left/right).

I'm pretty sure a wimpy little car stereo could not handle this... however I am wasting two channels of a four channels amp if it could be done.

Thanks in advance.