There is no way those subs, even if I was willing to, would fit on that platform. That platform is actually a 10 inch ledge and ~2 inches has window trim invading space.
Those Jbl 3677 are mounted to the ledge and window boards with multiple angle brackets, and they are half as deep as those subs. I also have 4" of oc703 wedged in on that entire wall.
I did try at one point to put the subs one in each corner, both facing in both facing out.
I really think the fact the room being 16x15 and the speakers firing back into the L opening is the cause for my response problems.
The fact I open the door, which is at the corner of the back wall that is the 8ft section of wall closest to the front wall where the speakers are, and lose 4-5 db of my peak/nul
l says that energy is being let out and not reflecting as badly off that back wall. Whereas the second half of that back wall is the L and is 8ft deep so energy has an extra 8ft of space in that half of the room.
It doesn't matter where I have moved those subs the response has been best where they are at. I did put one behind the chairs with no success too. The only place I did not try was.... In the L area. The only place they could end up in the L area is in the back corner, which is a sliding glass door.
I really should have tried one back there to see what happened but since it wasn't an option i just couldn't bring myself to lug one back there just to see.
I am satisfied with the response assuming its not the cause of the output problem. As MK said, I should be getting the output in a peak at the least.
I will check the DR setting on the receiver, but I went through audio settings and turned it all off one by one. Even tried some while on etc.
Most of this thread has been about trying to get the response. When I got the mini dsp and flattened things out is when this thread turned into an output issue.
After reading and thinking back, and producing all the graphs, I am convinced the 'odd' sounds I was hearing from the subs a few days ago while listening to music was the subs being overdriven, or the mini being hooked up wrong. In fact the next thing I am going to do is get the subs up to the volume level they crap out at and play the sub test music OEB gave me in this thread. The same music I was listening to that day.