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Loudspeaker Designs and Articles for the DIY Enthusiast
The
AviaTrix
MTM and MT designs offered
in various configurations for
Music and Home Theater
Applications
Driver Selection Process:

Shortly before this design was envisioned, Parts Express had come out with several new drivers. Among them
was the
RS28F-4. This tweeter is the soft dome version of the popular RS28A aluminum dome. This is a very
impressive tweeter at any price, (Let alone the entry price of a paltry C-note for a pair.) The
RS28F-4 offers
near class leading performance, and some of the lowest crossover capabilities of any tweeter. This low
frequency performance significantly improves the center channel horizontal off axis response compared to a
typical commercial design.
Links to:
Aviatrix Main / Design Goals
Driver Selection

Sealed MTM Cabinet Construction
MLTL MTM Cabinet Construction
MTM Crossover Design

MT Cabinet Construction
MT Crossover Design

Measurements
The ND140-8 proves the old axiom “You can’t tell a book by its cover.” The stamped steel frame of this
aluminum coned neodymium motored driver belies its abilities as a fine sounding and very capable midwoofer.
Its relatively high Qt can be used to good effect in both the sealed and transmission line designs, and provides
more bass extension than would otherwise be expected from a 5.25" midwoofer. The lack of a dust cap
provides a smooth and elegant look. Another useful attribute is its claimed Xlim of 20 mm, which is about 3 to 4
times more than most 5.25" drivers. I did no independent testing of the Xlim, but the driver appears to be more
than capable of providing quite high SPL's with no audible or mechanical issues.