Power Amp Schematic

I need to purchase a switch that can turn on and off with high power from a speaker amp. Would a 10A work?

What type would I need and what type of Wiring schematic would you suggest? Also, what gauge wire would be a good one for distances that are approximately 50 ft. long runs. I need to be able to turn off “zones” of speakers coming from the main amplifier. Four zones with 3 able to be shut off. This is with a high powered crown amplifer that is run to multiple speakers, not a home theater setup. Thanks!
What I am looking at is http://www.radioshack.com/product/index.jsp?productId=2062525&tab=summary
Would the Voltage of the switch be important? Would there be one that would be preferred over another? I noticed that most are 125 VAC what exactly does that allow?

I would suggest that you first lower the output power, then switch ON and/or OFF the speakers. An amp that is driving an 8 Ohms speaker and is outputting 800 watts, will be applying 80 Volts to the speaker. E = squareroot(W*R) = sqrt(800*8) = sqrt(6400) = 80 volts. 125 volts isolation on the switch should be fine.
The wires for 50′ length should not only be of a good gauge, but also with many strands, since the high frequencies travel on the periphery of the copper wires, reducing its effective cross section.
Be sure that, if you are paralleling all four speakers, each one is no less than 8 Ohms, so the parallel is 2 Ohms. The Crown may tolerate that, but if you have four 4 Ohms, then the parallel is 1 Ohm, not good.

60W MOS FET DC Power Amplifier