ZYGI
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Hi bladesmith,
Welcome to the forum.....
I'm not sure what you have there. The first, and I mean very first DM944's had the rounded corners at the top and bottom, and were only 8" wide.
Then we switched to the square corners and went to a 8-3/4" wide, drivers at this point were not flush mounted. These ran for about 5+ years now, so they weren't transitional for sure.
With that said, I never built a pair 9" wide until the switch to DM945's, Plus I don't show any built with black walnut. We did black oak, which is painted oak veneer.
The rest of your dimensions are spot on.
They were only ever available in 4 ohm which works better, for the most part, with Decware amps.
The frequency response of the DM944 and DM945's are the same. We just switched to the better binding post, a better cap on the tweeter and flush mounting the drivers. The binding posts on the 945's offer the ability to bi-amp if one chose to do so.
ZYGI
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