Originally Posted by
dumdum
You should get 6db of summation when two speakers play together, if not they are not in phase with one another (this is why LR 24db crossovers work, the crossover point is 6db down and in phase so the average level through the crossover becomes flat when summed
Hmm... Well, if they are not completely in-phase, I'm not so sure I can really do anything about it. Wiring polarity is correct, time alignment is correct and I'm using LR 24dB xovers - what else can I do?
Above, @ckirocz28 mentioned this:
"Yeah, you'll be hard-pressed to get that 6 db increase from speakers a car width apart, they need to be within a quarter wavelength of each other to get the full coupling effect. Subs and midbass are fairly easy to couple like that, mids and tweets are not. And the reflections absolutely figure into that problem, and all the other nastiness our cars provide."
and @SkizeR confirmed that:
"Yup. Probably caused by reflections"
I took those comments to mean that "it is what it is" and that there really isn't much I can do about it with the way the speakers are installed (factory locations - aiming striaght up into the windshield).
If that is the case (that there is not much I can do about it), probably the best I can do is to add 1.5dB to "Target Level" when EQ'ing the dash speakers in REW and subtract 1.5dB from the "Target Level" when EQ'ing the door midbass speakers in REW. That would give me my 3dB difference and make it so the resulting frequency response would pretty much match my target curve. I think. :-)
Or am I missing something here?