Greetings all - hope this is the correct forum to ask this. I am happy with my AV kit in a dedicated cinema room - Marantz AV7704 Processor, ATI AT527 Amp, JL Audio f212 Mk2 Sub, Epson 9300W Projector, M&K SS150 rear speakers, Dali Phantom E80 ceiling speakers, B&W 805D L/R speakers and B&W HTM4D Centre speaker fed from an OPPO 103. In addition to movies, I listen to a lot of music, predominantly concerts (not classical!) and recently replaced my original 3 LCR M&K S150s for the B&Ws as these do seem to sound (to me) perhaps a little more musical. But I just can't leave well alone! I am forever trying to eke out just a little more sound quality, a little more dynamics! In the good old days when 2-channels ruled, I could save up for better quality speaker wire, interconnects, even an off-board DAC. But how to tweak things now? Is there any merit in better quality HDMI cables for instance? I have always had such a keen ear for sound quality (two in fact), though perhaps we all simply just 'get used to things' and I should be satisfied with the way things are.....which brings me on to the second part of my musings - the OPPO works fine at present. But unlike the Sky Q I have hooked up to the system, it's not capable of anything approaching 4K. So what should I plan to eventually replace it with? I don't actually need a disc spinner as virtually everything I have is ripped to hard drives (mostly mkv format) which I just plug into the OPPO via USB, though I (occasionally these days) stream stereo flac music from a NAS. Any thoughts gratefully considered.....