Originally Posted by Pres2play
Here's a graph showing the improved FR. Man, the more and more you measure the clearer it gets just how hard it is to deal with a null. Raising the volume just doesn't work; it only raises the peaks all around the dips. After a few dozen measurements you really learn to appreciate REW.
Edit: I'll try a new measurement tomorrow with my Anti-Mode. Maybe it will settle the peak at 108. I'm not expecting much change. Maybe if I reset the XO above 100.
I measured the left speaker and sub separately to see which speaker is causing the peaks between 50 - 200 Hz.
The red line
is the sub only.
The green line
is the left speaker only with the crossover set at 120 Hz
The blue line
is the left speaker only, this time set at 200 Hz.
Except for one peak I think the subwoofer response is fine. (Remember, this is an 8" sub). The left speaker, however, shows a dip at 300 Hz, followed by a peak beyond the crossover point. This may be the result of standing waves between the ceiling and the floor. When I clap my hands near the speaker, there's a short echo, fraction of a second, that I don't hear in other parts of the room. The peak is reinforcing the sub's frequencies in the upper bass and making it louder than it should be. I can listen with the crossover set at 200 Hz, for now, but a correction will definitely be needed.
Edit: I've been thinking about this some more, it may be that the 8" subs are simply not a good match for my mains. The graph proves they don't play much lower than my mains. Also, the peak near the crossover may not be a peak at all -- it only looks that way, because of the large drop at 300 Hz. If there were no dip there, the rest of the curve would look relatively flat. I just have to find out what's causing this dip.Edited by Pres2play - 4/3/13 at 2:03am