With the Mathcad worksheets I designed a Mass Loaded - Tapered Quarter Wavelength Tube (ML-TQWT). The goal was to let them go down to about 50 Hz. The FX120 will need a little help on the bottom end. On the Fostex data sheet they show a flat frequency response without great peaks and drops.Įnclosure Design - Fostex FX120 T-Line Project There is not much information available for this driver, but the feedback from people who have used was positive. Searching a smaller driver the Fostex FX120, a 12 cm fullrange unit caught my eye. My first try was a speaker using the Fostex FE167E, but I never made proper cabinets for them because my wife said "No way, they are too big". King and decided to try a speaker design of my own. Looking for more information about fullrange drivers, I found the Mathcad worksheets by M.J. However, there are compromises with fullrange drivers little drivers have disadvantages at the low end and bigger ones at the top end. Fullrange drivers seem to play music with more coherence, more life and they sound more direct. I decided to give them a try and was surprised with the sound quality! Of course they did not play as loud as the bigger two-way speakers that I built before, but something else was fascinating. 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. Introduction - Fostex FX120 MLTL Speaker Project
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