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But lets say for arguments sake, all 4 are flat to 20hz, any difference?
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It's fairly easy to find a decent location and then equalize one sub. Some people here do two. It takes a bit more fooling around and the two subs have to be identical.
I would suspect it would be quite a challenge to get four subs flat together in a room, but I suppose you could. They would all have to be driven from the subwoofer out, through four BFD channels, which would make for some fairly long interconnects, but it could be done. It would be uneccessary though, unless you had a massive room. I would think an IB would then be in order.
brucek