This might be a problem. Looks like your unit is bi-amped, with separate power amps and speaker wires for the woofers and tweeters. Roughly 40w/channel into each driver, with a crossover around 3 KHz.

Unless someone has a better idea, you will either need to get some biamp-capable speakers (either buying them, making them, or going inside existing 2-way speakers with some cutters and new wire) or mix the signals together with resistors and feed them through another amplifier.

Wish I had better news.

http://www.panasonic.ca/English/audiovideo/audio/audioentertain/specs_micro.asp

M60ti, VP180, QS8, M2ti, EP500, PC-Plus 20-39
M5HP, M40ti, Sierra-1
LFR1100 active, ADA1500-4 and -8