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simple enclosure for Fostex FE-208EZ?
simple enclosure for Fostex FE-208EZ?
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Old 28th June 2020, 09:17 AM   #1
Havoc is offline Havoc
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Default simple enclosure for Fostex FE-208EZ?

I made a pair of Bruce V1.2 from the Frugal-horn site (Spawn family). Started it a long time ago but it got shelved when life came in the way. Can't say I'm happy. Very thin sound, bit like a tiny transistor radio in a cavern.

Is there a reasonably simple enclosure for those Fostex speakers so I can at least salvage them into a usable speaker? The enclosure Fostex proposes is a bit a puzzle of all little pieces and I'd like something with less sawing involved. Something like a simple BR?
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Old 28th June 2020, 02:19 PM   #2
Scottmoose is offline Scottmoose  United Kingdom
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I'm not surprised. Bruce was designed for the FE207E, which had rather different specs. to the FE208ESigma, and for it to work in that enclosure, the latter really needs some series R (or an equivalent high / adjustable output impedance amplifier). The overdamped (low Qt) characteristic is why it's not well-suited as-is to regular vented box loading.

You don't mention what your amplifier is, but if it's a regular voltage source type amp, then with a 2.5ohm power resistor inserted in series, about 13 litres tuned to 67Hz would be OK[ish] near boundaries. If you want more, then assuming about 6.8ohms series R, 44 litres to 44Hz would do, in similar conditions. 8.2ohms series R would allow a Vb = Vas, Fb = Fs alignment, near enough.
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Old 29th June 2020, 05:45 PM   #3
planet10 is offline planet10  Canada
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simple enclosure for Fostex FE-208EZ?

It is worth mentioning that the same resistor trick Scott specifies for a simple reflex should also work with Bruce. I would try that first before venturing towards a new box.

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