Most of my listening is with LCD-XC and LCD-X. As I previously stated, I use Headroom Management and volume leveling in Roon, so I lose -6 to -8db there. I also listen to some poorly recorded "classic rock" that requires more power. The album Little Queen by Heart is one of the albums that I had to have SP400 at 90-100 volume. SP200 at 60% has much more headroom. Again, SP400 does get loud, and is SUPER clean. Sounds Superb.(I bet this amp MEASURES better than the A90. It sounds better) I want more output than SP200, and SP400 does not deliver. I would be impressed if they could have retained the output of SP200 with the clarity of SP400. The race for the "best measurements" is disappointing to me. Maybe SMSL will release an "upgraded" version of SP400 like they did with M400? I don't wanna get caught with another prematurely released product like the early M400 with rca output rolloff. They almost got me again.....