>>So Rich, as John B. discussed, one possible factor causing that 250Hz dip is the center of the woofer cones being a quarter-wavelength distance(about 14-15")from room surfaces, especially if two or more surfaces(e.g. ceiling and back wall)are involved.
>>Holy Cr*p. Or should I say, DUH! I ran over to the tape measure and guess what? You didn't even really need me to measure, you already knew, didn't you? Almost exactly 14" from the ceiling to the center of the woofer cones, and a little closer to 13" to the back wall.
OK, that was creepy. At minimum, I'm impressed
