Krell 4K Processor sounds like the guts have been pulled out


Equipment:  Krell Foundation 4K Processor, Mark Levinson Reference Amps, Revel Salon # 2 speakers,  2 B&W ASW 12CM SUBS, great cables, electrical supply, ect.
Problem:  Krell & entire system used to sounds awesome, now the bottom is missing.  There is no punch to the music. The volume must be turned up 50% more to achieve the same listening level.  Low level listening was sweet and full, now it is very shallow focusing on mid and high range music, leaving out the bass and thump.  Subs rarely kick in-all adjustments and settings predicate the subs should be working.
Recent change to system:  New Xfinity cable box-latest generation.
Attempted fixes:  My AV specialist has gone through the system to check all settings, which are spot on.
I do not have a center channel speaker, (I find them annoying),  and I like listening to musical performances at concert levels, in stereo, as they play on TV or play back off my Xfinity DVR.  Does the Krell suck, or has it gone bad?  Last update to the Krell was late 2017.
128x128robertwdavie

Nothing was wrong with it. It just needed to be reset and have firmware and DSP initialization that updated the DSP software. Its sounds awesome now. I love it.