Figure 3: Fostex FX120 ML-TQWT Baffle Step Compensation Circuit Fostex FX120 ML-TQWT Enclosure, Cutting and Building Plans The BSC is necessary, otherwise the sound isn't balanced. I played with the length of the port and tested several values of inductors and resistors for the. I began to tune them by ear until I was satisfied with the music coming out of the speakers.
Figure 1 shows the calculated frequency response for the FX120 for the enclosure shown in Figure 2.įigure 1: Calculated Frequency Response - Fostex FX120 ML-TQWT (T-Line) Figure 2: Enclosure Plan - Fostex FX120 ML-TQWT (Transmission Line) At first they were a little bit harsh but after about 100 hours they smoothed out. King for his kind help and advice) I made some test enclosures out of chipboard. With his feedback 'I think you have a design' (I want to thank Mr. King and asked him to have a look at the simulation I had completed. 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. On the Fostex data sheet they show a flat frequency response without great peaks and drops.Įnclosure Design - Fostex FX120 T-Line Project The FX120 will need a little help on the bottom end. There is not much information available for this driver, but the feedback from people who have used was positive. Searching a smaller driver the caught my eye. My first try was a speaker using the, but I never made proper cabinets for them because my wife said 'No way, they are too big'. Looking for more information about fullrange drivers, I found the Mathcad worksheets by and decided to try a speaker design of my own. 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. Of course they did not play as loud as the bigger two-way speakers that I built before, but something else was fascinating. There's a related design called TQWT - the most popular implementation being the Metronome. Amp and pre, Meridian CD and Project turntable, B&W Matrix and Theil speakers. An annual single-end tubefest, and then reading Herbert Jeschke TQWP (tuned. Talk in the Full Range Driver Forum and elsewhere on the merits of the Radio. I must confess to being a DIY Internet junkie for speakers and tube amps. I decided to give them a try and was surprised with the sound quality! 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.
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