Trying to set up a 5.1 speaker system. Have a question about matching speaker impedances in HT setup. My fronts are rated at 88db efficiency and at 8 ohms. Center is rated at 90db and at 4 ohms (same brand). Surrounds are rated at 90db at 4 ohms. (different brand). I will be playing system at somewhat loud levels but never at reference levels. I have not bought either the speaker system or receiver yet. My concern is whether it's a good idea to have impedances different all over the place. Don't want the Marantz to run out of steam trying to drive 4 ohm loads in the center and surrounds. I was thinking that maybe since the 4 ohm surrounds and center are more efficient, it would be OK.
Please help. I will be taking the plunge in a few days. Does anyone know if the SR7500 can run 4 ohm loads comfortably? If it's a bad idea, can someone recommended me a decent receiver with sound quality on the "warm and musical" side that is in the same price range.