Another amp to speaker question..

Hi,

I already have an pheonix gold rsd 500.4 amp, connected (bridged) to a pair of kicker kmt6.

I want to add either one or two others kmt6 to my setup.

Is it possible to do with my current amplifier? How should i hook it up to my setup, considering I want to avoid getting another pair of wires up the tower?

thanks

Link for the amp specs:

http://reviews.cnet.com/car-amplifie...html?tag=specs