Electronics > Beginners

Can I connect a 100W subwoofer to the 40W+40W rear speaker outputs of a stereo?

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epigramx:
It's for low quality requirements in an old car so high audio quality is unimportant, just to not suck totally. It has a new stereo that outputs 4 X 40W to speakers but only the front ones are connected (or exist).

Can one just stick the outs of the rear speakers to a 100W subwoofer and get power to it that way? To be honest I do not even know if it's "allowed" to connect the positives and neutrals of speakers like that.

Byonnem:
Why not power it with 1x 40W? Underpowering a speaker does not hurt it. However it could possibly damage the amp. (but if that is the case then 2x 40 is still underpowering!)

I do not see how connecting multiple outputs to one speaker could be a better idea.

themadhippy:
Dont connect the outputs together unless you want to buy a new amp, wire the sub to 1 channel only .if you want to experiment, and do it at your own risk,  try the speaker wired across both the + outputs,dont connect anything or link the - outputs.

james_s:
Most head units use an internal amp that is already using a bridged configuration so you cannot bridge multiple outputs. you need to filter the higher frequencies out before they get to the sub anyway though. Amplifiers are dirt cheap these days, just use a sub amp, most head units already have a line level sub output.

Audioguru again:
You cannot connect audio amplifier outputs in parallel, even if they have the same signals (stereo often has completely different signals). If one amplifier plays an output but the other amplifier plays it with opposite phase or plays nothing then both amplifiers drive a direct short circuit and might be destroyed if they do not have a protection circuit.

If you connect a speaker to only the + wire of both amplifiers then identical signals from both amplifiers (usually bass sounds) will be cancelled and the amplifiers will be overloaded when signals have opposite phase.

A simple solution to your requirement is to use two subwoofer speakers, one for each rear amplifier channel. 

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