I owned a REL Strata II which I used to good effect with a pair of B&W Nautilus 805s. Then I upgraded to Audio Physic Virgo II speakers. I then found I got better results on music by disconnecting the sub, and I ended up selling it. The Strata II certainly was able to add more to the bottom end, but the quality was not on a par with what the Virgo IIs were delivering - either that, or the sub was just not integrating well (and I played with the settings a lot). I found that the sub added more, but, as the saying goes, 'sometimes more is less'. Just my two cents. Good luck.
