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Post by Boomzilla on Nov 13, 2013 21:19:30 GMT -5
Well, my power amp has a built-in adjustable high-pass filter, and the sub has a built-in adjustable low pass filter, so theoretically, I'm ready to go. The only issues to dither about are slopes. I'd assume that the Maggie rolls itself off at about 12 dB per octave below about 40 Hz? If the high-pass filter on the amp adds another 12 dB per octave, then the effective roll-off is about 24 dB per octave. The sub's low pass is 12 dB per octave, making for an even-order match. Therefore, theoretically, the sub should be set to 180-degrees out of phase with the satellite for the crossover to reinforce rather than cancel at the crossover frequency, yes?
On the other hand, most of what I've read recommends crossing the satellites over at an octave above their -3dB points. For the Maggie 1.6s, this would be 80 Hz. Assuming I've a sub that will remain nimble up to 80 Hz., is this a feasible option?
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Post by pedrocols on Nov 13, 2013 21:38:53 GMT -5
Do you run the Maggies full-range and cut the sub in at 50 Hz. or do you use an upstream crossover to do the division? Thanks. I use a upstream crossover to the amps so the speakers only see 50hz and up with a 18db slope. That is how the crossover is design. In addition, I use a test CD to level match the speakers and the subwoofer at the cutoff frequency which in this case is 50hz. |
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Post by pedrocols on Nov 13, 2013 21:47:17 GMT -5
Mind you that my speakers are MG12 and not the 1.6 but with the test CD I can measure a good strong response (using a spl meter)in the vicinity of 40hz. In the Magnepan website it states the freq. response is 45-22khz +/-3db and I believe that to be very acurate.
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Post by pedrocols on Nov 13, 2013 21:52:38 GMT -5
Well, my power amp has a built-in adjustable high-pass filter, and the sub has a built-in adjustable low pass filter, so theoretically, I'm ready to go. The only issues to dither about are slopes. I'd assume that the Maggie rolls itself off at about 12 dB per octave below about 40 Hz? If the high-pass filter on the amp adds another 12 dB per octave, then the effective roll-off is about 24 dB per octave. The sub's low pass is 12 dB per octave, making for an even-order match. Therefore, theoretically, the sub should be set to 180-degrees out of phase with the satellite for the crossover to reinforce rather than cancel at the crossover frequency, yes? On the other hand, most of what I've read recommends crossing the satellites over at an octave above their -3dB points. For the Maggie 1.6s, this would be 80 Hz. Assuming I've a sub that will remain nimble up to 80 Hz., is this a feasible option? This is how I cross the speakers but only when watching movies. My subwoofer has no crossover built in so I use the receiver to adjust the crossover for movies and for two channel listening I use the other outboard crossover. |
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Post by Metaldude on Nov 14, 2013 7:08:00 GMT -5
Wow, I change my socks every day I don't use staples to hold them up , ouch...  |
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Post by Boomzilla on Nov 14, 2013 8:06:37 GMT -5
Be a man!
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