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Re: Fostex FE168 Sigma - Kurt Strain, what did you cook up?

Posted by Kurt Strain on October 1, 2001 at 20:24:44:
http://www.melhuish.org/audio/diy12.htm
That's the project I started from. There's still too little bass with this enclosure and those Fostex drivers. I use the Fostex 168S's in them. To increase bass I use thin 30 ga. magnet wire of about 15' length which has about 3 ohms of resistance. This increases the system Q and increases the bass output. Alternatively, or in conjunction, you can add some bass boost. A well designed 3-5 dB cut ending at 1 KHz will sound good. Also, a touch up with slicing the top of the box off to a rectangular endpoint instead of a line can improve bass as well as some wooden slant in the mouth. Lots of things to fix this problem.
One of the problems this speaker has is that there's simply less bass than treble on a finite width baffle. There is a bass rolloff that ought to be compensated for in some manner. What I do is use an old Eico integrated amp as a preamp because it has bass and treble controls. I boost some bass and cut some treble and add that speaker wire resistance. It actually sounds very good. I don't think you can expect a perfect response by dropping in any old full range driver in a typical "horn" box. There's more engineering needed or at least some tweaks to compensate like I did. For any given Lowther type enclosure there are only a few acceptable driver candidates that will work in it, and those vary a lot still.
Keep at it. This is part of the education and the fun.
Kurt