ok thanks, can you explain exactly how this would work?

I have one cable going to each of the L and R speakers. Do these both get fed into the 218? how does this work? there is one input and 2 outputs on the 218 for speakerlink????

how can this be installed and at the same time carry on as normal for all my other audio/tv e.t.c.?

G65, HD621, 5x DSP5200SE, MC200.