CJ, can you give us your impressions as to going to that 4th sub and what differences you found from using 3 subs? I also use the Geddes multi sub approach and am using 3 subs at the moment.
Dan
Dan,
I haven't had it too long yet, but each sub was an improvement and the last just smoothed things out some more, sort of like improving the laminar flow to a body of water or allowing the mass of air in the room to pluck and dampen with greater uniformity. I especially like the increased subtlety of the bass tone, which I guess must be masked when the excitement nodes are more active.
The third subwoofer above ear level was more dramatic than the fourth, but the fourth so far is also easily noticable. I think I am at the point of diminishing returns, but who knows, I don't have anyplace to put another subwoofer anyway. The last two are ten inchers, light, bass reflex types rated to 25 Hz. The first two are 15 inchers, rated down below 20Hz.