I'm thinking about getting rid of the PB16 Ultra and going with the Rythmik E22. I've read that the rythmik subs are a little tighter and better sounding. PB16 ultra can sound muddy sometimes. Don't get me wrong, it's an amazing sub, but just feel like trying something different.\n\nYou are in for a huge loss in deep bass output going from the PB16-Ultra to a E22. I would say that muddiness from the PB16 is much more likely a matter of room acoustics than the sub itself. The E22 might sound a bit more articulate simply for lacking deep bass output. The greater ratio of mid-bass to deep bass that you get, the more "detailed" the sound may appear to be, but it is artificial detail, i.e., not truly a matter of the recording.\n\nIf I were you, I would get a measurement mic and install REW to see what is going on. The problem is very likely a matter of room acoustics. You may be in need of a multi-sub system to fully solve the problem, but you need to see what the problem is to start with.