Just a New Year's Eve teaser- at least the last of the crossover parts (cross fingers) "hit the dock" yesterday, plus those for the TMM version.
Well, here I am today doing all kinds of responsible stuff like cleaning and organizing, instead of working on speakers, so the devil in me decided I had to do a small teaser post....
I will not be doing a long build thread, but am preparing a PDF for download detailing everything- DTP is less hassle and work than posting so much material on a forum.
The heart of this project is mating the SS D2608-9130 to the good ole MCM waveguide. I could tell it would be a bit tricky because of the shape of the tweeter mounting plate.
The solution I chose was to create an RTV seal filling in the bevel gap, and to grind the rib plates on the waveguide appropriately.
The waveguide was milled for the correct opening on my router table to a total height of 1-1/4"- and I mean exactly 1-1/4", to a 1/64" or better tolerance. A backing plate of 1/4" MDF is used on the back of the front baffle; of course, the front baffle rebate is critical, too.
As I had some nice LBL scraps around from another project, I made the tweeter mounting plates from that material- about 20% harder and stiffer than maple, it should provide a solid "launch" platform and secure the rear of the waveguide. These were actually fabricated from two narrower pieces that I had to glue edge on with Titebond 3, roughly down the centerline of the tweeter.
The interior front walls and back are lined with Whispermat 3/4" single layer. Crossovers will be mounted on the back side walls. The system is ported, tuning in the upper 30's, with 7" long 2" Precision port.
The first system is spoken for, I've tested a TMM version that led me to develop a TMWW version. Rock and Roll Hootchie Koo? :B
Updating the first post to include the PDF link since the project has been completed. This thread wandered all over the place- save yourself some time if you wish and download and read the PDF for all the core details.
Note this is now known as the Modula MT XE, to better reflect the nature of what it is and the nature of the build- XE = Xtreme Edition.
Modula MT XE PDF
Well, here I am today doing all kinds of responsible stuff like cleaning and organizing, instead of working on speakers, so the devil in me decided I had to do a small teaser post....
I will not be doing a long build thread, but am preparing a PDF for download detailing everything- DTP is less hassle and work than posting so much material on a forum.
The heart of this project is mating the SS D2608-9130 to the good ole MCM waveguide. I could tell it would be a bit tricky because of the shape of the tweeter mounting plate.
The solution I chose was to create an RTV seal filling in the bevel gap, and to grind the rib plates on the waveguide appropriately.
The waveguide was milled for the correct opening on my router table to a total height of 1-1/4"- and I mean exactly 1-1/4", to a 1/64" or better tolerance. A backing plate of 1/4" MDF is used on the back of the front baffle; of course, the front baffle rebate is critical, too.
As I had some nice LBL scraps around from another project, I made the tweeter mounting plates from that material- about 20% harder and stiffer than maple, it should provide a solid "launch" platform and secure the rear of the waveguide. These were actually fabricated from two narrower pieces that I had to glue edge on with Titebond 3, roughly down the centerline of the tweeter.
The interior front walls and back are lined with Whispermat 3/4" single layer. Crossovers will be mounted on the back side walls. The system is ported, tuning in the upper 30's, with 7" long 2" Precision port.
The first system is spoken for, I've tested a TMM version that led me to develop a TMWW version. Rock and Roll Hootchie Koo? :B
Updating the first post to include the PDF link since the project has been completed. This thread wandered all over the place- save yourself some time if you wish and download and read the PDF for all the core details.
Note this is now known as the Modula MT XE, to better reflect the nature of what it is and the nature of the build- XE = Xtreme Edition.
Modula MT XE PDF
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