How does a REL subwoofer add dimensionality and depth to a sound system?
Wow, the OP’s original question was pretty quickly forgotten. I hope this does not turn out to be a thread for REL haters and owners, but some seem itchin’ for a fight.
I’m a bit like @hilde45 on subs these days. When I bought my Britannia B1 and Storm III it was years ago and most of these new subs either did not exist or were not known by anyone. REL was one of the most musical subs offered, period. My B1 with my mains was fantastic and tight, running very low bass only.
That said, the most recent three subs I bought were two SBS SB-2000s and one SB-3000 and all three sealed subs are now in my audio room. The B1 went into the home theater (with an old DefTech PF1500) and the Storm III audibly lights up the 14x18 ft TV room now.
I believe in the DBA concept now, but feel that poster missed the OP’s question as well, even though good points were made on why DBA works well. As for the rest, why not start an “REL sucks” thread and have your own fun. :-)