I'm selling my Rythmic F12 sub with A370PEQ3 (370WRMS PEQ) amplifier. First owner and it's a non-smoking home. I would very conservatively rate 6/10 as there are a few scratches on the sides and rear corner as seen in close-up pictures. I had the woofer replaced with an original factory unit by Hawthorne Stereo in Seattle. Extremely powerful, great sounding sub that was very easy to integrate into my system. Only selling because I upgraded to full-range speakers.
From the manufacturer:
The subwoofer for audiophiles
For audiophiles looking for uncompromising accuracy, our F12 subwoofer is the ultimate choice. It features our Direct Servo technology to ensure accuracy and definition. As an audiophile you appreciate that bass is the foundation of a satisfying music or home theatre experience. You also appreciate that there is more to a home theatre subwoofer than shaking the room, and that music can be far more satisfying with a subwoofer that can play deep.
What makes our subwoofers suitable for audiophiles? It's not that they can plumb the depths with authority. There are already many subwoofers on the market which can do that. The difference is that they reproduce bass with a level of realism that is normally only associated with much more expensive high end full range loudspeakers.