Below are a few pictures illustrating my second endeavour into the realm of achieving sonic bliss. For those who absolutely have to know, the cabinets are made from 18mm Russian birch plywood, with 3/4" solid red oak laminated to the front and back, and solid poplar on the edges of the shell. They measure 216mm x 1080mm x 360mm (8.50" x 42.52" x 14.17", W x H x D) and weigh 28.2kg (62.2lbs) each—oak is heavy. Their inside is lined with Spectra Dynamics Deflex panels (the effects of which I still have to learn), and about a quarter of their volume is stuffed with Acousta-Stuf (the effects of which I could readily appreciate while installing the drivers). It's a standard MTM array (after Joseph D'Appolito) in a 44L (1.55ft3) ported enclosure tuned to 32.7Hz, using a pair of 18cm (7") magnesium cone mid-woofers from SEAS (Excel W18E001) and a 28mm custom silk dome tweeter from North Creek Music Systems (North D28-06S) crossed over at 2.2kHz with a 3rd order (18dB/oct) Butterworth filter. The dual input cups are not primarily for bi-wiring (I yet have to learn what this might be good for), but merely for easing improvements of the outboard crossover—at least that's the plan (and I know that there is a lot to be learned in that department).
To be continued, once I learn more about speaker measuring...
Alas... Shortly after I had assembled a pair of probes with alligator clips and voltage attenuating resistors as per my speaker measuring software (LspCAD), my laptop decided to die on me. Needless to say that the new laptop came with a new version of Windows, obsoleting the drivers for the fancy sound card I had finally got to work. And as if to add insult to injury, I recently learned that the Thiele/Small parameters I had used to model the enclosure for the mid-woofers were off quite a bit according to the manufacturer's recently revised published specifications (SEAS Excel W18E001).
To be continued, once I learn even more about speaker measuring...