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if i connect 2 channels (100rms @ 4ohm each) of an amp to 1 voice coil on a sub (svc 4ohm) ,

what happens, does it work?


or will the amp die? :blush:
 

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more than likely the amp will go into protect as soon as you turn it on. if not, then see the above picture. not something you want to do unless it is a bridgable amplifier.
 

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If you bridge the two channels, you'll have more power. If you copnnect them in parallel (both to one coil as you have suggested), any difference in potential between the two channels will set up a voltage divider and current will flow from the channel with the highest voltage into the speaker AND into the other channel. May protect and may not. If it worked perfectly, the same voltage will be present, so even if it didn't blow up, you wouldn't have more power (current is determined by the resistence of the load).

So...In short, don't bother. Nothing good can come of it.

We used to make Power Series amps in JBL that would allow this connection and the circuit used a sensor to precisely match the voltage in both channels so all of the current would flow through the speaker. The amplifier made the same power into 1 ohm (as a high current amp with the channels connected in parallel) as it did into 4 ohms (with the two channels bridged, which is essentially a series connection). Few people understood what it was for and we didn't sell very many of them.
 
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