Summary: As part of a Dolby Pro-Logic system this is superb. Phase, output levels and db threshold can be adjusted. You can FEEL the output! One reviewer said it lacked depth - not sure what that means for a sub woofer as the sound is omni-directional - probably using it for a bass guitar!! As far as I am concerned (and this not my first sub-woofer) it works perfectly with my Pioneer VSX-S510-K amp on a 5.1 speaker system - highly recommended.
Summary: Had been looking for woofer for quite a while that would meet my wife's stringent requirements on style, size and anonymity in the lounge. Problem was that nothing that could deliver the depth I wanted would fit that. The Jamo was perfect, blends in really well with the decor and delivers really great quality depth to music and movies. Was much better than the price suggested it might be. Took a little while to get setup correctly but delivers great sound once done.