OK... but the electronics don't have a 'sound'. Good quality recievers, amps, etc are all supposed to process signal without changing it. They don't add coloration, flavor, or smells... they are designed to preserve the source signal.
The only thing that is going to affect the sound are the transducers: your speakers. And yes, this includes members here saying that they couldn't hear the difference between expensive external DACs vs what came stock in their AVRs or Processors.
I listened to the speakers I bought on a First Watt Amp and a $2400 DAC. I didn't buy those so I could enjoy my speakers when I get them. I'm going to run them through my Marantz and some Outlaw 2200 Amps. And they will sound just as amazing as what I heard in my audition.
For Bluetooth, whether its internal or external, its still a link in the chain. I used a Rocketfish Bluetooth receiver for years... still have it... has analog and digital outs. Cost maybe $20-30. Works fine. I only use it now in a work room to listen to audible, pandora or apple music.
But you say you are worried about signal degradation and want to stream bluetooth over your phone. Sorry, but those two statements are at odds with each other. Your best signal would come over Ethernet direct from your router, then wifi, then bluetooth.
There are already a lot of product recommendations here. I won't try adding to them. But the features, ergonomics, and style are things that only you can determine for yourself. If none of these work for you, then consider going back to the drawing board. Maybe a Stereo Preamp with full features and an External Amplifer would be better suited for your needs. Or an AVR. You don't need to get one with 13-channels, but the feature sets can be very well developed, including bluetooth and a phono stage, as well as good DACs, network connectivity, etc.
Cheers!
