Design Goals

This one is pretty self-explanatory: Design an MT based on the
TriTrix MTM and earlier Triune high-value designs. The primary
emphasis was to provide an easy to build design which was voiced to
match the TriTrix, and be suitable for use anywhere a small efficient,
reasonably full range speaker would be a requirement. You should
be able to build these for about $55 each for drivers and crossover.
Double that if you purchase the PE enclosures.

Driver selection

To keep the sensitivity and value high, the same drivers were used
as in the Tritrix. The DC130BS-4, and the DC28FS. The impedance
is consequently lower than the TriTrix  MTM, but should be an
acceptable load for any 6 ohm rated amplifier. The drivers are
shielded, so HT or use as computer speakers will not be an issue.

Enclosure Design

In a departure from previous designs, I designed the TriTrix MT
around the Parts Express .25 cu. ft. finished cabinets P/N
302-700/702/704. For those who do not have the wherewithal to build
their cabinets, or simply what a professional looking cabinet, these
are a great value. For those who like to 'roll their own', sufficient
information is available to build your own. In this enclosure size
(actually .3 cu. ft) the sealed exhibits a modeled Qtc of .68 and f3/f10
of 85 Hz and 48 Hz respectively. Interestingly enough, the same size
box vented, and tuned to roughly 45 Hz, provides a low end roll off
similar to a sealed design, at least down to f10 or so, with much
better bass extension. The vented f3/f10 frequencies are 58 Hz and
37 Hz. I would suggest building the vented version, as you then have
the best of both worlds. Thanks to Wayne Wendel for building exact
duplicates of the PE boxes.
I calculated about the woofer to have about 7/8" between the baffle
edge and the frame edge. -This is a center spacing of approximately
3 3/4" from the sides and bottom. The tweeter also has about 7/8"
between the the frame edge and the near side and top edges. I
calculate it's center is about 3 1 1/16" from the top, and is offset
approximately 3/4"

Crossover Design

No surprises here. It's a similar topology to the TriTrix MTM but with a
slightly higher crossover point of 2100 Hz, and an added inductor in
the tweeter network to flatten the tweeter response in the top
System Impedance Plot
System Phase
Woofer Network
Tweeter Network
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System Frequency Response