“Ok, 145 watts per channel. Is that all 5 channels? My existing speakers- main left, right, center are good to go. Rear speakers in ceiling are rated for 50 watts. If rear channels are 145 watts, is there a control to limit the power for the rear?”
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The Yamaha V385 is rated 70W per front L/R channel at 20Hz-20KHz 0.09% THD into 8 ohms (US/Canada specs). It is also rated 85W per channel (each of all 5 channels) at 1KHz and 0.9% THD. There are some higher ratings at terrible distortion levels, such as 145W at 1KHz into 6 ohms at 10% THD. I would not plan to go over about 50W per channel to have decent sound and receiver longevity, but that should be plenty loud enough for a home theatre system with reasonably efficient speakers and a separate subwoofer or two. If you are having a large party and want club level volume you need a whole other level of equipment. The ratings of your speakers are the maximum they can handle. The power drawn depends on the volume level. Of course you can change the balance from front to rear and also the timing (perceived distance).
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