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RE: "the push-pull ribbon of the T1-D" ...

It is do-able. Not that the thin (1/8") Masonite board is very suitable for mounting the drivers to.





There are a few things that can be made differently. Like removing the drivers from the original baffles (well... maybe there is a better word for it in this case). The push-pull tweeter can be cut down in width in order to allow the drivers to be mounted closer to each other in a new baffle/supporting frame. The width of the speaker will shrink, making it suited (a must almost) to "the narrow room setup" as for the T-IVa. Low bass close to the side walls, then midbass and the tweeter on the inside. Adding a ribbon is also possible.

I dislike having directional information from all the three drivers. A new crossover may be the way to go. The first order slope of the push-pull tweeter is probably better replaced by a steeper order one, maybe at lower frequency (700-800 Hz?). I would also like the low bass driver to be rolled off earlier, maybe at 350-400 Hz, leaving the mid bass going up to 700-800 Hz. Adding a ribbon tweeter maybe at 5 kHz. This calls for some experiment...

Outline of a cut-down tweeter.




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