Crawford Theater

[jrc]

Hi
First post and REW nooby! Thanks in advance for all this site does!
My equipment/room is as follows:
Room is 20 ft wide x 38 ft lg x 9 ft high approx 6800cuft
JTR Triple 12LF LCR Speakers 50hz to 20Kz Behind AT Screen
Klipsch THX Surrounds 4 Ea
IB Sub 4 ea 15" drivers (AE Stryke) driven by QSC RMX1850HD Amp
B&K Ref 200.7 Amp
B&K Ref 507 S2 Pre Pro
No FBD yet...
Macbook using M-Audio MobilePre USB audio interface and Behringer ECM8000 Mic and Radioshack spl meter for cal.
Here is my first graph showing Mains and sub crossed at 50hz. Feedback please...Does this look good bad ugly? Should my next step be a measurement with sub only?
Thanks for the help in advance!
Jeff

[jrc]

Here is the Sub only graph with crossover set at 50hz HP slope set at 12db and LP slope at 24db
It looks like a pretty big dip at 50hz. My B&K has three notch filters to use. Should I use one at 35 hz and another at say 58hz? I am really new at this so any suggestions are welcome!
Jeff

[brucek]

I wouldn't do a lot Jeff. It's quite a good response.

With respect to the sub + mains plot, I might adjust the subs phase control a bit and see if you can remove the dip at ~80Hz.

brucek