Diagnose the weak link.

I'm enjoying my Sony XA-5400ES CD player mated to my new Bryston 4B SST2 power amplifier & Thiel CS 3.6 loudspeakers. My preamplifier is a 25 year old NAD (#1130 I believe?). The sound is powerful with bass that needs tidying up. I plan to put the Thiels on Sound Anchors stands to try to focus the bass. Where I need help is with trying to separate out the layers of sound during loud, complex passages. Also vocals seem recessed and lyrics are hard to make out. The sound from this system is getting better (compared with my old system) but I really need some guidance to separate out the layers of sound and achieve the higher articulation this system should be capable of.