Quarter Wave Box Calculator

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Quarter-wave transmission line speakers employ enclosures that are tuned to provide low-frequency extension for the speaker driver. There are several types of transmission line enclosures and one of the more popular ones is the mass loaded transmission line (MLTL). Basically, an MLTL is a quarter-wave transmission line enclosure with a port. Below is a quarter wave ground plane antenna I made for 23cm, 1296MHz which is made from off-cuts of household mains copper wire and a scrap BNC socket from the junk box. The one pictured below is for receiving ADS-B aircraft signals on 1090MHz, again using scrap copper, but this time a purchased N-Type chassis socket. While the ML-TL enclosure appears to be a simple vented floor stander, the enclosure internal height was carefully chosen so the quarter wave resonance was a bit higher in frequency than the port. This helped augment the response sag in what would otherwise have been an extended bass shelf alignment. This resulted in a nice.

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