Hi all. I have the big 16 channel / 8 zone C4 matrix amp (C4-16AMP3-B) and was hoping to get some advice on optimal set up for sound quality and user experience. I'm using pretty expensive in-ceiling speakers ($400/pr KEFs) though unfortunately they don't have a back box. The sound quality is really thin / lacking bass. Is there any way I can improve the sound? Can I access any kind of settings to adjust the bass / treble etc? Also, if I am mostly using Spotify, what's the best way to have the dealer set up the system? For example, I'd really like to be able to walk into any room and just airplay from my phone to a particular room, without having to interface with 2 or more apps. I thought the dealer could set up multiple Spotify drivers for each room so that I can just select that particular room driver as the device to which to stream, and this would automatically airplay to that room only. But my dealer says that won't work because I only have one EA3 and one EA1. I think he's wrong but grateful if someone would clarify. (To be clear, my concern is NOT about multiple simultaneous streams but rather a simpler way to stream a Spotify source to a specific room.) Thank you!