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In Reply to: RE: Great result ... posted by shumi on July 12, 2020 at 05:57:20
If you have the 3.6 high passed at 200 Hz, you are hardly using the bass drivers of them as the mids are used to 200 Hz (if you have not chosen a different cut-off).
Follow Ups:
"... Not using the external Magnepan crossover boxes. ..."@Roger Gustavsson,
He is not using the bass panels.
He is using the 3.6's OEM overlapping asymmetric XO points and slopes (LP250/18dB HP200/6dB) to actively biamp the stereo triple subs. He used the servo sub's plate amps phase adjustment to fine tune the phase matching.
I am doing a similar arrangement with my 20.1's but with different XO point slopes.
This has been done before and the following is the first time I am aware of. This image is from an old defunct/archived audio forum where a guy's bass panels went south. Considering the shipping costs for 20.X bass panel repairs, he made stereo OB/Dipole line arrays to replace the bass panels and gained extra extension in the process. If memory serves, he used 10" drivers here.
Edits: 07/12/20
Not using the bass drivers of the 3.6 or the 20.1? A bit of waste to me. I think it would be okey to crossover at 80 Hz or so for the 3.6 and a bit lower for the 20.1.
Edits: 07/14/20
Roger,
I agree, the 80 Hz crossover needs to be evaluated for sure. My original plan was to start with that and then move up but I decided as a first step to try 250 Hz.
Here is an interesting video from Mike, the OCDHIFI guy who knows Magnepan speaker also recommending an 80 Hz crossover. Yes, Mike needs a belt for his pants!!!! He also has GR subs.https://www.youtube.com/watch?v=uXErcOEdTuI&t=1412s
Edits: 07/13/20
It allows for the subs to be placed outside of room modes without tainting imaging (don't have to move mid/tweets) which is a plus.
It also gets the bass coloration off the midrange and increases dynamic range in the bass/sub region.
FWIW, I get much better midrange clarity with my 20.1's doing this. I have also done it with my 3.6's.
Don't knock it until you have tried/heard it.
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