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RE: Seems there is no XO-1 in the setup

Yes of course, this has been said several times by people in this thread, - and it could well be the main reason why the fuses are blowing. When you run these speakers as intended from one amplifier into the external crossover, the branch leaving the external crossover that runs to the internal crossover (the part that goes onto the mid and tweeter) is first filtered by the external crossover of low frequencies, which protects the mid/tweeter, - its obviously bad to feed that section a full range signal. I am not technical at all so can't explain why its bad but its qutie obvious to me that feeding that section a full range signal is a bad idea.
I think if you ran the speakers properly, - as intended, with either one of your amps ONLY then the fuses would not blow. You need to stop running the speakers with two amps like this right now!!

Of course too with active operation the branch going to the mid/treble section is also filtered of low frequencies by the active crossover, giving the same protection (as the external crossover does in passive configuration)I would have thought.

I think you referred to the passive external crossover box of the IIIa (the metal box with wooden sides) as the XO-1. Obviously the XO-1 is very different, - its a much smaller black box.

This is the MGIIIa speaker level external passive crossover box
http://pic3.audiogon.com/i/c/f/1274753615.jpg

and this is the line level XO1 passive crossover used for biamping these speakers
http://pic3.audiogon.com/i/c/f/1278030066.jpg


Cheers,
Colin


Edits: 08/09/10
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