Thanks. Yes, pretty quiet. The Jecod DCS 7000 was a bit whiney to begin with, but I can't hear it at all with the cabinet closed and the powerhead on. The RW-20 makes a low level buzz and comes and goes with the wave setting it's on, but I don't really notice that anymore - some people comment on it, but with any kind of background noise (which is pretty much constant in our house with either kids or music playing), you just don't hear it.
Yep, will review the CP-40 when it arrives.