The name MLTL (mass-loaded transmission line) arises from work by Martin J King, comparing computer-generated loudspeaker models against built and tested transmission line speakers. Martin produced a set of MathCad spreadsheets which enabled users to virtually build, refine and measure of this type of enclosure.
The MLTL is an enclosure dominated by a combination of quarter wave resonance and port mass. Adding a port allows the designer to shorted the transmission line’s length. Other parameters can be adjusted in the software to arrive at optimum results. One advantage of the MLTL is that the area behind the speaker unit can be damped, suppressing mid- and high frequency reflections, in a manner which would be detrimental in a typical reflex enclosure.
It’s a system capable of very high quality results. The new MLTL30 is designed specifically for the Jordan Eikona 2. It doesn’t go as low as our MLTL38 but the shorter cabinet may be more domestically acceptable. The graph below gives the MLTL30’s calculated response.
Plans for the Eikona MLTL30 can be downloaded here. As always, if you build an enclosure we are happy to see photographs and feature them on our Facebook page.