I own a stock Opus 21 system incl. XS & s80 integrated amp. I love it! I have no interest in the GNSC mods. It sounds great stock. I hear no emphasis in any frequency range. And what's really nice with it is you don't have to use interconnects. All you need is an upgraded power cord and you're set. Resolution audio provides an umbilical cord to connect the separate power supply to the CD player. My transport is a little temperamental but it really doesn't bother me. I can explain in detail if you wish. Ditto with Kurt_tank; customer service is second to none. I've spoken to Jeff many times & he is a consummate pro. As I speak I'm working on a system for my bedroom. I'm not sure what direction to go. I have thought about another Opus 21 system.
Resolution Audio Opus 21: Highly recommended!!
Resolution Audio Opus 21: Highly recommended!!