Since the last firmware the Wiim PRO is able to cast Airplay 2, I would like to buy one to stream my turntable to Airplay 2 speakers. My question: Does the Wiim Pro have a built-in preamplifier so that I can connect my turntable directly to the WiiM Pro, or do I still need a separate phone preamplifier for it? Also, I don't see any way to connect the ground cable of the turntable to the Wiim Pro. It would be nice if someone could enlighten me.