I am updating my amp and the new amp I am looking at does not have a fixed level rca line out (before volume control) only a pre amp rca out which means when I turn the amp up the output from the pre amp rca out increases. I like to connect my amp to my SONOS Connect using it's rca line in so that anything I play on my amp eg record deck or tv or physical cd can be streamed to my Play 3 in my kitchen. Is it ok to connect my pre-amp out on my amplifier to my line in on my SONOS Connect? If it is ok what happens when I turn my 70 watt Naim amp volume control up!!