Ok, I was thinking of hooking up two bookshelf speakers (Klipsch KB-15s) on each side of the entertainment center, rather than just the one pair I have now. My amp is a Denon. It specs Speaker A,B as 6-16 ohms, and Speaker A+B as 12-16 ohms. It recommends not using speakers with a lower rating (ex 4 ohms) at high volumes for long periods due to overheating. So, the speakers are rated: NOMINAL IMPEDANCE: 8 ohms compatible So, if you were to hook two up per side, how would you wire it? Both on Speaker A in series (16 ohms): Amp + to Speaker1 +, Speaker1 - to speaker2 +, speaker2 - to amp - Both on Speaker A in Parallel (4 ohms): Amp 1 to speaker1 and speaker2 +. Amp - to speaker1 and speaker2 - One on each Speaker A and Speaker B...(Which I think would be the same as hooking both up to SpeakerA in parallel...i.e. 4 ohms. Amp power is 75W/ch at 8 ohms, 110W/ch at 4 ohms, and no rating for 16 ohms. Each speaker is rated at 85W/ch.