- I did not create the idea of a sonosub, that was happening way before me, but i brought some popularity to large and low tuned designs when there werent a whole lot of <20hz subs.
1. What spacing did you use between the 2x4?
12 inches on center, so 8.25 inches between boards.
2. Do you think I could either rip them to say, 35mm across x 19mm high (or even 12.5mm) or perhaps do without them entirely - i.e., just the high density foam strips, say 70mm wide, spaced under the OSB?
You could do 1x4s flat and not have to rip anything. I dont have experience with it, but i would personally worry about the feeling of the foor if only doing foam or rubber strips under OSB - i would imagine the lumber adds rigidity. Also, the higher the floor is suspended, the more rumble or bounce i would have to think you get.
3. You appear to be suffering from hyperbass syndrome (I just made that up) - and so have a huge amount of power to get things shaking. If you only had 2 x 18" subs would you still add the floating floor?
Yes. I used to live in a townhouse that was carpet on a concrete slab when i was running just the two 18 LLTs, and while the bass sounded amazing, there was virtually no rumble in the room, definitely no bounce. When i moved into my current house and ran just one 18 LLT upstairs in the living room (main floor over the basement) with a tv, the bass experience was much much better.