Originally Posted by charles dodgen
Yes, XT32. After which, I just played with the avr's (Denon 3300) subs(2) distances to get the smoothest crossover between my fronts and center. For some reason, at the time I decided to just work with the distances/delay and left the subs' phase alone for the most part. So, I got some improvement just now from your suggestion! I reversed the phase (180 degrees) of the back sub (SB12). That gave me a peak where the dip was at 24Hz, but it cratered the response right below my 80Hz crossover with my center speaker (the purple trace). I then tried 90 degrees on the SB12. That kept my crossover pretty much the same but reduced the 22Hz dip by about 9dB(green trace)! I said the dip was 25Hz before, but it's actually around 22Hz. The response stays flat to around 25Hz, so I really don't have too much to complain about. Just trying to justify getting another SB2000 to replace the SB12 so I can use it with my nearfield desktop setup.
I'm glad you are seeing improvements! The important question is; does the new response actually sound better
than the old response?
A couple of comments/questions;
When you say you "played with" the sub distances, were you performing the Sub Distance Tweak? If so, did you make sure to adjust each sub distance by the same amount? The sub distances, once set by Audyssey, need to be kept the same relative to each other.
Did you try the SDT with the "SB12 flip" response? There's a good chance that you could keep that higher output at 25hz and
flatten out the 55-75hz area. Worth a shot!
Your current response is very flat (+/-3dB from 23hz-85hz). However, us humans prefer a rising response in the bass since our ears are less sensitive the lower the frequency goes. A razor flat response doesn't usually sound very good to us. Dynamic EQ (if you like using it) will mostly take care of that, but you still may want to bump up your final sub trims 3-6dB. If you don't use DEQ, you would want to bump up the trims a few dB more than that.
No need to take a screenshot with REW, just use the "Capture" button (camera icon) in the upper left corner of the screen.
REW subwoofer graphs should be posted with 5dB increments on the left hand side. This makes it easier to see problem areas (not that you really have any) and easier to compare to others' graphs.
You seem to be measuring at a fairly low SPL (~65-70dB). Is there a reason for that (e.g. wife/kids sleeping
)? Typically, it is recommended to measure at least +30dB over the noise floor of the room (which is typically in the 45dB-55dB range).