im putting together an entertainment sound system for my apartment. I'm a gaming enthusiast so it has a Pc with a Sound Blaster Z as the 5.1 source while using existing components. Ok my questions: Could I use my Polk Sound bar with sub as a center channel as I already own it and it's not currently in use? Why or why not? I also own an Altec Lansing 1407a 75watt rms mono amplifier if I had to buy a passive center channel speaker would this mono amp be usable? Why or why not? thank you