Q&A for How to Bridge Subwoofers

Make sure you read the manual, and if that doesn't work, then contact the company from where you got that stereo.

Use the positive from channel 1 and the negative from channel 2 to one of your subs. Then use the positive from channel 3 and the negative from channel 4 to your other sub.

It depends on the amplifier. If it is capable of driving (powering) low impedance loads, then it can be done. If you end up putting the subs in series, then you won't get much volume out of the system. Attach + to + and - to - on the dual voice coil, then + to + amp on the single, - (single) to + (double), then - (double) to - amp. If the dual VC was 2x 4 ohm, that would give 2 ohm; if the SV is 4 ohm, you add the 2 to get 6 ohm.

If you do not keep the impedance correct (4 ohms, 8 ohms, etc.), you can blow out your amplifier. Also, there is the question of whether or not your amp can handle additional speakers.