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In Reply to: RE: You have my attention. :-) posted by josh358 on April 09, 2014 at 10:41:13
...the midrange section of the planar panel were integrated with the woofer section? Is it the same foil? There are a few things I need to research in order to gauge the feasibility of this maneuver, but I am coming to terms with the reasoning behind it.
I would build a new set of frames. It could be a fun project, but it would probably take a while. I'm only half-serious right now, but the more I think about it, the more I like it. ;-)
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Check out the tuning dots on this picture that Roger posted:http://www.twin-x.com/groupdiy/albums/userpics/mg_3_7.JPG
There are now tuning dots at the border of the woofer and midrange, which used to have a clamp. There's no way of knowing precisely what frequencies the segments are tuned to without more information. But my guess is that they're using acoustical equalization to make it a 2.5 way -- a necessity because with a single-pole crossover, each driver has to cover a wider frequency range, and for good polar response you need to keep driver width small compared to wavelength. If so, the 3.7 isn't a very good candidate for an add-on midrange. You're either going to have too much of a gap (if you put it next to the old midrange) or you're going to have it on the side opposite the acoustical EQ. Both could exacerbate lobing.
But the first step I think would be to get more information. You could get the frequencies of the resonant sections with a microphone, an RTA, and a pink noise generator -- just move the mic along the grille cloth and see what happens to the frequency response.
Edits: 04/10/14
...it would be simple enough to swap the left and right panels. That would put the unused midrange section on the opposite side from the midrange and tweeter. I imagine that it would be good to mechanically damp the non-driven section. As I said, this is just an idea that I'm beginning to entertain. Lots of research would have to be done before venturing down this path, and this is a start - thanks. ;-)
Mechanical damping might work. You'd want to leave the bottom part undamped, e.g., imitate a 3.6 with its solid clamp. This would shift the acoustical center of the bass frequencies back towards the center of the woofer section. It would also reduce the output at the frequency of the full width of the speaker. This would definitely require some experimentation and measurement.
OK, so here's another idea -- put a line-source electrostatic midrange (an Acoustat, say) between the woofer and the ribbon.
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