Originally Posted by jkasanic
You are overthinking this. All I said was you needed to measure across the width of your "room". The most likely locations would be the front wall (not possible except for current location and one other), back wall, or behind your couch. The point of this is to confirm the 40-60 Hz dip is from a width mode (in your case the first order width mode). If you find a spot that minimizes this dip then you can experiment with moving your sub (and couch) along the length dimension of the room (moving it closer or further from your front wall). Since your MLP is 14ft from wall, I would try moving it 2-2.5ft closer. The tighter spacing means a change of just a couple inches can make a big difference at one point (your MLP).
So I went on a rampage yesterday for about 3-4 hours diligently trying different sub locations
. I tried all the locations I have available to me, and varied the way the driver was facing in each location. I narrowed down the best spots on the length wall (35ft wall), and then tried variations of spots on the front wall (width wall) to gather the best curves I could get for comparison. I also tried measuring one foot right and left of the MLP, as suggested, and it did seem to raise the 50hz dip when I move the MLP one foot to the right, but then I seem to get a dip at 70-100 hz from doing that. I also varied the spacing of the couch from the front wall as suggested. In some sub positions it helped a bit, and with some sub positions it made response worse. I just can't find a great balance in my PITA room.
I analyzed and compiled the best curves I could get to see what you guys think. Which do you think is the best in my case?
Blue line= midway on length wall w/couch 12 ft from front wall
Red line= left of my left front tower, driver facing couch
purple line= right in front of my couch facing front wall on the length wall
green line= front left corner, driver facing into wall (about 1.5ft away)
teal line=front left corner, facing the side of my left tower
In my untrained opinion, I think either the blue line or one of the two green lines might be best. the second graph is a compare of just those three. The downside of the blue line is that I seem to lose a lot of SPL in the lower frequencies. In the front corner, I get the highest/flattest lower end SPL but the upper range doesn't look that good, and I have that dip at 50hz. Since my towers will be helping in the mid/upper range, would it be better to take the best low end response and let the towers help fill in the mid/upper range?
The third graph attached is one of the corner positions plus the LR towers, which I didn't think looked all that bad when combined (at least up to 100hz), but I could be wrong. Thanks