rsf507//// Bought new, Got a very good deal, IMO. Yes, it is the model you described with a Network Card. Right out of box after playing with filters (my choice #2 minimum I think it was) sounds quite accurate and very Dynamic, all instruments get their chance to shine individually. Will only get better with time.
Once I choose a new computer to download the interfaces.( Qobuz to new unit and Audirvana). I can only HOPE, actual streaming via streamer/Ethernet connection is that superior to my earlier USB stream????? thanks all very much.To a new streamer, very valuable info !!!!!!