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In Reply to: What if... posted by wazoo on April 9, 2014 at 19:02:47:
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
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Follow Ups
- RE: What if... - josh358 06:09:22 04/10/14 (2)
- I was afraid of that, but... - wazoo 06:39:34 04/10/14 (1)
- RE: I was afraid of that, but... - josh358 07:03:05 04/10/14 (0)
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