Wondering if anyone else is experiencing increased bass levels in STEREO and UPSAMPLE modes vs. BYPASS. This happens when I feed a digital signal (CD via digital coax) as well as analog (PHONO). Not that I would ever go through the A/D - D/A process for the PHONO, but it's puzzling for CD playback. However, I've read that most people cannot hear the difference between BYPASS and UPSAMPLE (except for the increased volume level). The front speakers are set to LARGE, and subwoofer is set to NONE. I checked the treble & bass settings, and they're at 0. I then used a direct connection from by CD (with variable out) directly to my amp (thus taking the 990 out of the signal path), and the STEREO and UPSAMPLE modes are obviously outputting unnatural amounts bass. I don't believe this is related to any sort of bass mgmt issue. Any others experience this?