Hi BB. Yes the internal processing of a DSP or an equalizer results in about 2.5ft of delay not 14 ft like the Outlaw suggested. Delay can be expressed in distance or milliseconds. Most people find it easier to set using distance ie. the further the distance, the earlier the sound starts at the speaker/sub. So a sub with a long distance delay will start reproducing sound well before a main speaker of shorter distance. They will be out of phase if the delay settings aren't right.
I also have a pretty sophisticated equalizer a Behringer DEQ2496 with all the bells and whistles and it recommends in its manual not to use the auto functions below 100hz. It has more to do with the difficulty of accurately measuring LF sounds owing to the long wavelength. Its typical Behringer with no BS.
People say the the latest Audessey technology has finally solved this problem but I'm in wait and see mode on this one. I would only use the 990 auto feature for speaker settings.
