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In Reply to: RE: Active crossover with 48dB slope capability? posted by Jim_E on October 26, 2009 at 16:16:19
if you look a little deeper into the deqx site you will find more info. the phase alignment on planars is definitely worthwhile. the point is to maintain flat phase through the crossover. the way they do it is to divide the frequency spectrum into many (thousands?) slices and then align the slices. they call it group delay as certain groups of frequencies need to be aligned (especially the ones in the mid/high crossover). the only way to do that is to very carefully measure the system output. i admit they try not to be super specific about their algorithms but it's pretty damned good and repeatable by my experience. i've gone so far as to use other measurement software just to check what they're doing. here's a phase measurement at the listening position after correction. this is absolutely amazing. i know for a fact that results like this are not only very audible, but not attainable by any other means with multidriver loudspeakers. the included parametric eq can fix just about any room issues you might have. they call it "minimum phase" parametric, but at those low frequencies it's just trial and error to get it all to line up. i didn't use their "room correction" software, i just did trial and error with cuts and adds to flatten things out and time the different bass drivers in my system for maximum impact and dynamics. i tried the room correction wizard once but thought it was a little too conservative to my ears. it found the same room modes, but didn't make the cuts and adds as steep or as much as i liked. etf5 measurements confirmed what i was hearing.
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