Full Range Transmission Line Speaker Design

There are several types of transmission line enclosures and one of the more popular ones is the mass loaded transmission line mltl.

Full range transmission line speaker design.

A transmission line loudspeaker is a loudspeaker enclosure design which uses the topology of an acoustic transmission line within the cabinet compared to the simpler enclosures used by sealed or ported designs. I decided to give them a try and was surprised with the sound quality. 25hz 20khz range with very warm rich bass creamy midrange extremely detailed high end and outstanding impulse response. I used two to three pounds of pillow stuffing material per speaker.

The original thor transmission line design was published in may 2002. Speaker build visaton diy speaker using acoustics visaton clou. Introduction fostex fx120 mltl speaker project. My first introduction to fullrange speakers was about 4 years ago in a german diy audio magazine which featured a small transmission line speaker project using a vifa 10 bgs 119 8 driver.

Inside a transmission line loudsp. Basically an mltl is a quarter wave transmission line enclosure with a port. Jon risch on classic design expands on the classic rules of thumb. Transmission line speaker build visaton diy acoustic housing design transmission line.

Tl design mysteries there are many mysteries to the design of a successful transmission line speaker. Full range transmission line designs the construction was the same as for the sealed box subwoofers described above except that these speakers must be densely filled with a safe material. The transmission line is a seldom used speaker design which is preferred by many audiophiles. Instead of reverberating in a fairly simple damped enclosure sound from the back of the bass speaker is directed into a long damped pathway within the speaker enclosure which allows far greater control and use of speaker energy and the resulting sound.

The transmission line system is a direct radiator alignment that is designed to use the 1 4 wave resonances in a waveguide to enhance and extend its useful range of operation. Note that the line can be lengthened by increasing the length of the front piece. One of the most important speaker building projects published by audioxpress thor was designed by joseph joe d 039 appolito who is world renowned for his pioneering work on mtm based mid tweeter mid loudspeaker configurations. For this online publication audioxpress kept the original article unchanged which has.

Quarter wave transmission line speakers employ enclosures that are tuned to provide low frequency extension for the speaker driver. Rules of thumb classical instructions for the design of a tls.