There are a couple of tones that seem to reverberate more than others but that can most likely be corrected with room treatments. I have a Radio Shack sound pressure meter that I plan to break out and test the actual decibels, but by ear it sounds pretty consistent. So after changing the crossover frequency and adjusting the volume, I now have a fairly consistent volume from 35hz up through 150hz and beyond. This led to the conclusion/discovery that my MMGs aren't really kicking in until around 56hz. When I first ran a slow sweep from 30hz to 80hz, I noticed a big drop-out around 50 - 55hz, mainly due to the fact that my sub crossover freq was set at 50hz, per Magnepan's suggestion. I downloaded a tone generator to my PC and I discovered that I could use it to help nail down the sub-woofer settings. I've been having trouble getting the subs' crossover frequency and volume set properly. I have Magnepan's MMG speakers, and also a pair of Outlaw subs. I use my PC and an outboard DAC - Motu 828mk3 - to listen to CDs.
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