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I have an Onkyo 601 and you do have to have the volume at 50+ to get much sound. I usually watch movies at 72 or -10 if you are using relative volume.
It's not really a big concern, it has something to do with the high current amp in the receiver. I would say it is safe to play it all the way up to the 80s. The receiver tops out at 100 but you will notice that once you hit the 70s & 80s the sound will get much louder with each increase in number.
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