re: Audiophile/Vinyl Thread - Post Pics, Advice, Questions, Setups, etc.

On another note, I have been battling this room/bass issue since I moved into the new audio room. There is a big drop (about -12 dB) from 48Hz to 70Hz, and it has been driving me nuts.

The problem is that the 11” woofers in the Focal mains are cancelling out at my listening position. There is plenty of bass in the room, just not in my sitting position. There is a 4-foot sphere around my seating position that is void of bass--everywhere else in the room is good.

This has all been tested with numerous mikes and software programs, and my ears were proven correct--the data shows what I am hearing (or not).

Room treatments really won't help. The length of a 50 cycle wave is around 20-22 feet long, and I am sitting around 11 feet away--so, just at the halfway point of the wave--right where it is canceling. The physics of it all makes sense. The room ended up a bit more "square" than rectangular, which also doesn't help.

Active room equalization also won't work (I've tried), as these all "cut down" peaks--they don't "fill in" voids.

So, I believe I may now use an active crossover, and cut the Focals off at around 150Hz, then add a pair of the new cylindrical SVS 4000 series 13" subs and run them from 150Hz down to 50Hz, and then crossover again to the 16" SVS sub to handle 50Hz and down.

This will allow me to stop the negative sound I am getting from the Focals, and also be able to physically move the multiple subs around the room a bit for flexibility, and then be able to dial in each set of subs separately.

I guess I will know if it works once I get it up and running and run an assload of software and tests.

If it doesn't, I will have a TD MB subwoofer fire sale!!