Thanks. the HK website says: "All Harman Kardon Audio/Video receivers can handle most 4 and 6 ohm speakers on the market today. However, there are some manufacturers' speakers that have a minimum impedance well below the 4 and 6 ohm nominal impedance."

As for the room...it is 16'x19' with 20' vaulted ceilings and catwalks on two walls above it. Still go with the QS8s? Thanks for the forum advice.