I finally have my three GR/Rythmik Direct Servo subs assembled and playing and so far I'm delighted with the results. They are all sealed using a single SW-12-04 and A370PEQ amp per sub. I've got deep, tight and fast bass with no boom or bloat at all. Using three of them, they are not working very hard so the amount of headroom is considerable. Big thumbs up to Danny and Brian for providing a top notch product. The good part is I'm sure that with more tuning I can get them even better. aa