I’m really glad you had the curiosity to learn more about the 4-sub DBA concept, took the initiative to give it a try in your room and that it’s performing so well for you.
I always find it difficult to describe just how well the 4-sub DBA concept performs in virtually any room and with any main speakers. It’s a bit frustrating because I try to spread the word through lengthy and thorough posts that likely only convince a few people sufficiently to give it a try, such as yourself, while understanding all along that even a brief audition of a good quality 4-sub DBA system would probably convince literally everyone. I take some solace in knowing that I don’t think it’s possible to overstate just how exceptionally well this concept actually performs. I sense an almost magical quality to how universally well this concept works which I attribute to the amazing psychoacoustic dynamics involved, mainly how our brains process an abundance of bass room modes existing in any given room that causes our perceptions to be that the bass is fast, smooth, detailed and natural.
There’s also another Audiogon member, dbphd, I’ve been working with and he’s just awaiting two of his Velodyne 15" subs to be repaired before setting up his own custom 4-sub DBA system. He’s also be using KEF LS50s for his main speakers and some of his surrounds in his combo music and HT system. Jdtalv may want to follow any existing and near future threads from dbphd for some very relevant info.
Enjoy,
Tim