Bruno, the numbers on the receiver volume control don't accurately measure the actual sound level that's being achieved. This has to be measured with an SPL meter. If you do this it's highly likely that you'll find that peaks played at a safe level(say about 105dB)are handled well by your 890. And no, you certainly can't assume that you can turn the volume up to +18 just because that number is on the scale. With some input levels(whispers would be okay)that could far exceed the capability of the receiver(and your ears as well).
