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Fostex FE108Sigma - Break in time
Fostex FE108Sigma - Break in time
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Old 19th September 2019, 04:39 PM   #11
Scottmoose is offline Scottmoose  United Kingdom
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The long-defunct Gemme Audio. They were pleased to call the design process 'nerve-shredding', which was presumably a euphemism for 'it took us a good few minutes to draw out the Factory design, then smooth it out for translam construction'. It also overlooked the fact (assuming they knew) that the manifold construction formed a functional part of the acoustic low pass.

They did finish them very nicely though, I'll give them that.
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Old 19th September 2019, 04:54 PM   #12
planet10 is offline planet10  Canada
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Fostex FE108Sigma - Break in time
And. IIRC, was asking something like $4k for them.

Gemme did inspire (a customers) the development of Lancet for the FE108e∑ (and a larger one in the same theme for the FF165wk).

Click the image to open in full size.

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Old 19th September 2019, 05:34 PM   #13
perkri is offline perkri  Canada
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Thanks

Switching to CBC Radio 2- more music - and it varies

So, the stepped internal "horn" benefits from those indents?

I was thinking of "rounding" them with a bent piece of thin ply, and filling the cavities with sand.

Not a good idea?

P
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Old 19th September 2019, 05:46 PM   #14
Scottmoose is offline Scottmoose  United Kingdom
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No, it's part of the acoustic low pass.
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Old 19th September 2019, 06:04 PM   #15
planet10 is offline planet10  Canada
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Fostex FE108Sigma - Break in time
If one looks at the scienc of ducts (bery important in HVAC for instance) an expension in the duct acts as a low pass filter, keeping unwanted “highs” (typically >250-300 Hz) from exiting the horn mouth.

In a chambered horn like th eone under discussion, the volume of the chamber and its exit/throat size also acts as a LP filter.

dave
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Old 19th September 2019, 06:15 PM   #16
perkri is offline perkri  Canada
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Thank you all!

Saves me contacting Foster
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Old 20th September 2019, 12:47 AM   #17
perkri is offline perkri  Canada
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Concrete or sand? The instructions call for sand to be "filled" into some of the internal cavities. Thoughts on using concrete instead? It'll be a heck of a lot easier to deal w the finishing if I use concrete in place of sand. Thoughts?

In other news... Put the drivers in the enclosures and crudely put in some filler. Terrible cables and connectors.

Had someone come into my listening room to check them out. They could not believe the sound coming from these speakers (nor could I)

And they are not even broken in yet!

They commented that they couldn't tell where the sound was coming from. Guess they disappeared

Cant wait for them to break in completely so I can tune the boxes.

So glad I followed through with this!
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Old 20th September 2019, 12:48 AM   #18
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Fostex FE108Sigma - Break in time
Use sand.

dave
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