dbphd:
"Tim, would using 3 subs instead of 4 violate a distribution principle? A single SMS-1 supports 3 equalized outputs, but you need to daisy chain to another SMS-1 for additional outputs. I have 2 SMS-1s, and they are thin enough to stack nicely if daisy-chaining is required. In the past, I've used on SMS-1 for the pair of HGS-15s, the other for the HGS-10s, but the that been in separate rooms. Since I have only two functioning subs right now daisy-chaining hasn't been an issue -- the HGS-15 only functions when I switch it to on rather than its audio-detect mode."
Hello DB,
Some DBA knowledgeable people I trust claim 3 subs can work almost as well as 4 in some rooms. I've only utilized bass systems with 1, 2 and 4 subs and have no experience using 3 subs in any room.
Your room is fairly large and I tend to believe 4 subs is a better option since there'd be less likelihood of a lack of overall bass output volume
levels and sufficient reserve power for realistic bass dynamics. I'd suggest using both HGS-15s and both HGS-10s.
However, since I've never tried a 3 sub DBA, I can't be certain it wouldn't work well for you. Perhaps you can try both and just use whichever you prefer?
Later,
Tim