Originally Posted by lk100
Bob, below are the ARC results:
OK, as I recall from your two posts above your problem is in STEERED bass during music listening (not LFE). You're hearing weakness in steered bass in your center seating position but not to the sides.
From the charts, it looks like you've got some really strong room coupling going on that is boosting LF/RF (and to a lesser extent C) in the 50-100Hz range and that is reducing Sub in the 30-100Hz range. These are probably the SAME thing with the coupling difference just due to the different placement of the subwoofer compared to your front speakers.
Now ARC shows that it has corrected this (your residual errors in Sub are really quite small), but it is evidently doing quite a bit of work to do so, and I suspect what you are hearing is that the solution is not equally good across your different seating locations.
There are two ways to address this: (1) Change your mic locations, and perhaps add more locations, and (2) change how those speakers are coupling to the room.
Now you do (2) by speaker placement and/or room bass treatments (e.g., bass traps in the corners and on the walls behind those front speakers).
As far as changing speaker locations, at these frequencies even inches matter. For example, try setting your subwoofer at your central seating location and then play a bass test tone and measure SPL where you would normally place the sub. Look for a location that maximizes the SPL near your current sub location. That's probably where you want to put the sub.
By the way, your lowest frequency output from the sub is Measuring just fine, so there's no indication the sub is too small for your room.
Alternatively, just try shifting the sub around a few inches at a time and re-Measure with ARC. You can speed this up by telling ARC (temporarily) that you only have a 2.1 configuration. You'll still need to Measure at all the mic positions, but it will go a bit faster.
In addition to trying to find a sub location that reduces its notch, you also want to adjust LF/RF (and to a lesser degree C) to reduce their peak. Again, some positioning adjustment can help, but it's more common for folks to tackle such issues with room bass treatments.
My guess is the bulk of your problem is actually in what ARC is doing to LF/RF rather than what it is doing to Sub. ARC has to cut LF/RF fairly significantly in the 50-100Hz range and it may be overdoing it a bit based on your particularly mic placements. Make sure mic #1 is at your center seating position. Alternate either side of #1 for subsequent mic positions. Make sure no two mic positions (whether or not sequential) are closer than 24 inches apart. Set the mic pointing straight up at seated ear height, and keep the mic away from reflective surfaces such as walls or seat backs. If necessary raise the mic tip a few inches to clear a seat back or move the mic about a foot closer to the screen to keep it away from a seat back.
The idea is to use enough mic positions, far enough spaced, to span the seating region you want ARC to handle. Ideally, your outermost mic positions should be beyond your side seating locations. This is often done in an arc with the outermost 2 (or 4) mic positions curving in towards the screen a few feet.