I started cooking up a MTM design after finishing my MT using Jamo 20306 51/4" mid-bass and Jamo 20452 1" fabric dome tweeter. These will be used along with the MT in a 5.1 system in my living room.
I measured both drivers with a WT-3 to extract TS parameters and with the development of impedence compensation circuits.
I plugged the appropriate numbers into WinISD .50a7 and decided on a box volume of .83ft^3 (i'm shooting for .8ft^3 after drivers, braces, etc.). The interior dimentions will be 20"H x 6.5"W x 11.5"D. I am keeping the baffle width to an absolute minimum.
The box is tuned to 55hz with 2 2" ports 5.5" long. This gives a simulated F3=49hz. Port noise is low, about 12m/sec so I'll be getting no port noise.
The box will be constructed of 3/4 sand ply cause I hate MDF even though it sands easily. The tweeter will be recessed and the woofers surface mounted since they have a nice curved flange. Baffle will be 3/4" thick with 3/4" chamferred edges, I'll brace where possible and I'll be covering the cabinet with some kind of veneer.
Time to set up and start the saw dust flying.