I am moving my home theater into a basement and want to have the lowest possible seat to seat variation. I already own 4 S1S-EX subwoofers but I dont know if I am able to put them in each corner/midpoints as Harman recommends. So the four will go behind the screen, and I will need some "helper-subs" which is easier to position than the S1S-EX's.
I know JBL Synthesis uses the S4S subwoofers with 2x10" for this purpose, but I was wondering if I could do a DIY solution instead. I already use the 2226H drivers in my LCR's and I think they have the same kind of bass as the 2242h's. But with an Fs of 40hz, I think it would be hard to make such small enclosures I need. Are there other JBL drivers which have the same "sound" as the 2242H and will work in smaller boxes? Sealed would be preferred. It does not have to go much below 30hz, but down to 30hz, it should be able to produce a descent amount of SPL.