Buy-wiring would be a better name. It sells you more wire and that's its main purpose. It takes twice as much wire.

Most speakers have a crossover, and Paradigms do. Buy-wiring does not bypass that. You will notice that the terminals on the back for the tweeter and the woofer are connected by a jumper. Buy wiring does not change the fact that both the woofer and the tweeter are connected to the same amplifier terminals: what it changes is where the connection takes place. Buy-wiring is done by hooking two cables up to the left and right amplifier terminals instead of just one. One removes the jumpers from the speakers between the woofer and tweeter terminals and connects one cable from the amplifer terminal to the woofer and the other to the tweeter. So, instead of having the connection at the speaker end of the cable, it is made at the amplifer terminal. Whoopee-do! Big deal! No one has proved it makes an audible difference to the sound, assuming you have cables of an appropriate gauge in the first place--because it does lower the AWG by about 3. Thus two 16 AWG cables would be about equivalent in resistance to a 13 AWG cable.

There is a table for determining the appropriate gauge of wire in the article in the following link:

http://www.roger-russell.com/wire/wire.htm