Originally Posted by steveting99
There's the problem with 1st reflections from your large center speaker bouncing off the floor and interfering with the direct signal going to your listening position. Try 'lifting' (via a stand) the large center speaker off the floor and point the tweeter to the Main Listening Position (MLP) and preferably where the ears are normal at. Unfortunately this may mean re-doing an Audyssey re-calibration and run REW again.
As pointed out by a few AVS members, please present the REW graphs in the accepted format for everyone. This is to ensure we're all on the same page and can provide guidance based on known standards. Re-read the wonderful guide provided by Jerry again.
Edit: What is the noise floor of your room in dB? Generally you would want to measure +40dB above the noise floor to get the decays shown in the waterfall and spectrograms. I.e. if the noise floor is 50dB, the average SPL should be around 90dB.
Thanks again for your feedback!
I re-measured in REW and corrected the graphical presentations with 5dB increments with the appropriate axis limits. The noise floor (relative silence at the MLP), measured using the REW SPL meter, is approximately -40dB(z) and 52dB FS, respectively.
In REW I measure each 5.0 (FL/FR/CC/SL/SR) speaker separately (HDMI/UNKI-1/Laptop/AVR), then I measure the dual subs separately. The baseline REW measurement parameters using the loaded UMIK-1 calibration file, (mic sensitivity, 9.6dB) are as follows:
01.) In AVR - Audyssey On (or Off) - XO is set post-AudysseyXT32, no DSP, no DV, no DEQ, no manual level or EQ adjustments
02.) AVR volume knob set to -15dB
03.) Win7 HDMI HD audio volume controls have no effect on the levels in REW, but it's at 50%
04.) the frequency ranges used is 20Hz-20kHz for 5.0 speakers and 20Hz-200Hz for the dual subs
05.) the sweep level is -6dB FS
06.) length = 512K
07.) sweeps =1
08.) the "check levels" for all 5.0 speakers fall in the -24dB level and -16dB level for the dual subs, where REW says "Level OK"
09.) after each measurement of the 5.0 speakers the "Headroom" ranged from +8.0 to +9.4, the dual subs were +10 headroom
10.) set the graph's axis dB limits with a minimum of 5dB increments
11.) set the 5.0 speakers with 1/6th smoothing, set the dual subs with no smoothing
See attached new measurements that reflect appropriate graph limits, the only changes were 1.) I removed the obstructions between the speakers and MLP and 2.) measured the CC, a.) flat on the floor, b.) with a 12.5 degree angle tilted up toward the MLP and c.) with a 22.5 degree angle tilted up toward the MLP.