The 500W Xconnect unit produced a reading between 39 and 40 dBA and the 600W X-Finity produced a reading between 40 and 41 dBA. Both are fairly quiet, just a few dBA over the noise level of the 'still' room, and they produce similar tones as they operate. Even without any calibrated instrumentation, I can tell that the X-Finity was slightly louder. - The Review
