I'm going to guess at what you really intended to write and hope this answers your question. I think you meant to ask:
Does bridging mean connecting two wires to the sub woofer, one to the positive terminal and one to the negative terminal of each amp (or each channel of a stereo amp)?
If I got the question right, the answer is NO. Bridging means that two amplifiers are fed the same signal
out of phase. That is, one input goes positive as the other goes negative. Then, you connect the subwoofer between the positive output terminals of the two amps. Many amps have a switch that automatically configures the outputs correctly.
Remember this golden rule of technology:
When all else failse, RTFM! *
.
.
.
.
.
.
*
Read
The
Fscking
Manual!
< Update >
Heisenberg -- Your description will only work if the amplifiers have
balanced, floating outputs. If the outputs are single ended, with the negative terminals being ground (common in home stereo) you will
not have a bridging configuration.