Rythmik F15HP (sealed) or FV15HP (ported).
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Thanks BDP I'll check out the Rythmik site.
I think what I may try is to continue with the REL to augment the lower frequencies of my PSB mains, using the high level speaker connection but no LFE connect. Then use the new sub, such as SVS SB13 for LFE effects. I think my Integra can handle this type of setup, if I can't get the two subs to integrate good enough, I may then spring for a second sealed sub.
Jafant, there is really nothing about the REL that I dislike, in fact for music it's really good. It will literally rattle the eyes on certain tracks. For LFE in my large listening room I think it may be marginal at best. So I think what I may do is keep the REL hooked up to the amp speaker terminals, then try a SB13 for LFE. Or something like that. If I could find a second hand R505 I would buy it, but they come up only rarely.
You might consider the HSU ULS-15.
I have a pair (not the MK2) in a 2.2 system. Cabinet is top notch, it's not too big (about an 18" cube), not crazy heavy (about 80 pounds).
If you are running the main speakers full range, you might consider crossing to the sub(s) at around 60 Hz. See distortion measurements:
I'm sure you're aware of the potential benefits of a pair of subs over a single. See the Harman whitepapers for detains: