Why not try factory crossover freq.s of 400 & 2000? [from my old Audio equip directory] Looks like this is a 3 way speaker, so you'll have to use the speaker's passive x-over for one portion, since you would effectively have 4 freq. bands - high, mid, low on maggie, and sub is the 4th 'band'. I'd guess somewhere between 50 & 80 hz for the sub x-over freq. Good luck.
Magnepan 3a active crossover points
I have made a couple calls to Magnepan trying to find out what crossover point to use as I use a active crossover in the triamp situation. My system is like thus. Sony preamp decoder feeding FULL range to the front left and right. This feeds a krell KRX three way active crossover. I am still playing with differant amplifiers so have not decided what to place where. I have many of them laying around. The highest freq will go to the ribbon tweets. The middle crossover point will feed the magneplaner panel. And the Lowest freq will go to a home made subwoofer that is built in the floor. I really like to overpower magnepans (if there is such a thing)so that voices come alive when I watch video. I hate boomy bass so I will take the magneplaner panel as low as I can get away with. For amplifiers I have the following. 3 x carver m-500 capable of 250x2 8 ohm or 700 into mono (don't laugh they mate up well with maggies in the upper freqs), an Adcom gfa 555 200X2 or 600 in mono ( could get another one and run two in mono), krell ksa 50, quatre 110wpc 8 ohm, hafler dh220, hafler 500, hafler xl 600, parasound HCA 1500a, rotel rb985. I have also though of getting two bryston 4b and straping them in mono. Long winded but this is getting complicated for a simplton like myself. And PLEASE, no insults :) This is for fun!
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