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Fostex speaker enclosure design10/31/2022
You can use two drivers in a bipole or dipole layout, but never on the same side of the cabinet. NEVER consider using two identical full-range drivers on the front baffle playing the same frequency range. If the cabinet is designed correctly, a BR can have very listenable bass.Ĥ. The general conclusion that all BR's have boomy and woolly bass is totally wrong. F3 is ~43 Hz and F10 ~35, numbers only slightly higher than a quarter-wave cabinet. Makes a lot of noise! An FE207E BR of 36 liters IS full-range. This is the setup I use for HT - four FE167E BR's around and a sub. With the bass load removed from the FE167E, dynamic range is increased dramatially and intermodulation distortion reduced significantly. However, if you use a subwoofer and high pass the FE167E BR at 80-100 Hz, things change dramatically. An FE167E BR is not truly full-range, since the F3 of a 24 liter cabinet is around 60 Hz. They are the smallest cabinets, the BR's being stand mounted while the quarter-wave cabinets are floor standers. BR's give you a mixed bag of compromises. They are best for small group music, jazz, voice, pre-Wagner classical.ģ. As long as you don't require great SPL, quarter-wave cabinets give a great sound. #Fostex speaker enclosure design driver#I get bass well below 40 Hz and the great mid's than one expects with single driver speakers. (You can force an FEx圆 into a BR, but IMO, the results are better if you use FExx7's) I have done quarter-wave cabinets for the FE167E and the FE207E with good results. #Fostex speaker enclosure design series#Use the FEx圆 series for horns and the FExx7 series for quarter-wave and and BR's. Well, that's not actually true, since you you really don't want to use the same driver in horns as you do in a quarter-wave cabinet. Quarter-wave cabinets are physically smaller than horns and bigger than BR's for the same driver. As with everything else in audio, horns require compromises. Horns tend to be picky about design specs and are not tolerant to construction errors. Horns are larger and more intricate than BR's or quarter-wave cabinets for the same driver. Horns will play louder than BR's or quarter-wave cabinets (MLTL's) and therefore are more "dynamic". Most horn cabinets are not well designed, but that is another issue. There is no science here and the conclusions simply make no sense.Given that the discussion applies only to full-range Fostex drivers:ġ. I strongly believe, that you won’t find a better sounding speaker for that kind of money in any store.My opinion of Common Sense Audio is less than favorable. (plus a weekend of work in the garage :-)). I have invested about EUR 350 for the two Fostex drivers, the plywood, glue and binding posts. I have partnered them with my first LM3886 based chipamp (in a test setup on a piece of MDF), which you can also see on the picture below. The bass performance of them is also astonishing when they are placed fairly close against the wall. I guess this is do to the clarity and coherence of the sound. I don’t think the frequency response is linear, but this is not disturbing at all and one can listen for hours without fatigue. The owner was very helpfull and responsive and can be recommended. The plan and the drivers have been purchased at Art of Sound. There is a bit of damping material in the upper, smaller chamber only. No crossover or notch filter is being used. I used birch plywood for the cabinet (16mm). The enclosure design is from Fostex as well. The fullrange driver used is a Fostex FX120. I have recently built these double bass reflex box speakers.
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