OK, so I finally got around to REW tonight. I wasnt sure if I should start a new thread with my setup, measurements, and tweaking since there are a lot of pics. For now I will post them here since it is about the Sentinel, but if anyone prefers that I just start a new thread and move all the pics there to prevent cluttering up this thread, then I will.
First of all, for those that don't already know, I've got Dual Epik Sentinels and a Denon 2310CI with MultEQ. I have a very open floor plan. The main room is about 21'x23.5'x8'-14' vaulted ceiling, which is also open to a 10'x20'x8' kitchen (12' wide opening). HUGE volume to fill. The couch is pretty close to being in the center of the room... I thought this would cause big problems... we shall see in the results.
When I first received the subs, I spent about an hour and a half experimenting with some locations and have not moved them since. Now that they've broken in, I may experiment a little more later but I am quite happy with where they are.
For measurements, I used the Analog Radio Shack SPL Meter with REW and a calibrated Sound Card file and Calibration file for the RS Meter. No smoothing was added to the plots. I performed a quick test with the Duals as pictured here, level matched by eye-balling the gain dial on the amps:
To get an idea of the room size and layout:
Once I performed my quick test I turned the left one off and left the right one on. I adjusted the AVR volume until the subwoofer test tone was targeted to 75dB. Here is the response of the right Sentinel alone with Audyssey MultEQ on:
I was very surprised at how good of a response I was getting considering my room and listening position. Very good low end extension in room also.
Then, I turned the right sub off and turned the left one on. Rather than adjusting the AVR volume until the SPL Meter read 75dB, I adjusted the gain on the Sub. Afterwards, I ran REW and got the following response out of my left Sentinel also with Audyssey on:
So the next step was to measure with both on. For this measurement, I did not adjust the AVR volume down to 75dB so you will get a true representation of how much gain duals is giving me versus a single.
What?!? At 14.9Hz I'm getting the original 75dB target! And I've only got one or two very narrow nulls or dips. On average, the difference in the best performing single and the duals was about 6-7dB.
Just for fun, I decided to see how much work Audyssey was actually doing. So I made a measurement with Duals with Audyssey OFF. Here is the result:
Audyssey clearly made a HUGE difference and allows these sentinels to show their S#IT! Needless to say, I'm a very happy camper. I'm very pleased with the overall output and am a little surprised at how much low end extension I'm getting. Thanks Epik!