It is like crossover building makes total sense. If l ran a test tone sweep through the mains with subs off the bass started falling off pretty steady below 50hz. Now it stays flat down to 25hz. It's the closest sound to a real drumset that ive had so far..l wasn't going for the deepest bass possible. ..l like alot of energy around the 50 to 30hz. range for my favorite music....The system didn't need a whole lot, but when the subs are perfectly blended with the mains it becomes a whole different beast.l should have done this years ago...l bought all four subwoofers used for 1000.00....l may consider some new Audiophile grade subwoofers down the road..such as Rel.or possibly some sealed SVS models....
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Multiple subs is the way to go. The more the better. Once you get to where you are now though (4) then yes better quality subs will be better. Also having them spread around the room, basically one per wall but asymmetrically not just one in each corner, helps to get smoother flatter response. Where are yours now?
What you apparently discovered by accident is called a 4-sub distributed bass array system. The key is having 4 subs and I've been using one for the last 4 yrs with large Magnepan panels. The Audio Kinesis Swarm and Debra are complete 4-sub DBA systems that sell for about $2,800, and the 4-sub DBA concept works like a charm. Here's an Absolute Sound review of the Swarm:
As you've discovered, you can create your own custom DBA using whatever 4 subs you prefer. The concept is based on scientific research done by Dr. Earl Geddes and Dr. Floyd Toole.
I and others have started threads on how well this concept works:
You can google 'distributed bass array', 'geddes' or 'toole' if you'd like to read more.
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