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Old 7th December 2011, 06:36 PM   #31
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Location: Sheffield
Originally Posted by karmik View Post
Sorry to hijack this thread but i'm having a *very* hard time finding a proper bass reflex duct in Europe for this very design.

Fostex specifications ask for a 40mm internal diameter, 50mm long reflex duct but the closest thing i can find is a cone-shaped bass reflex 140mm long with a 40mm diameter at the inner end and 50mm at the outer.

Cutting it of the proper length (50mm) i would end up with the wrong diameter. Any suggestions?

Another option is a plumbing pvc tube, but even that is only available in sizes of (outer diameter) 40mm or 50. Since the pvc tube is 2.5mm thick, i'll have either a 35mm or 45mm effective diameter duct.

Any thoughts on the matter would be greatly appreciated

Thank you very much

There's a similar problem here. Try looking for postal tubes. These are cardboard (read: easy to cut), come in a variety of diameters, and are straight profile. And also fairly cheap to buy. The plastic end plugs are removable.

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Old 7th December 2011, 07:49 PM   #32
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Location: D-55629 Schwarzerden
Default 10 liters Boom-Box (Hoge BB-4) with FE83EN + HP = acoustical CH-V Satellite Box

I like boom box alignments for vented satellite loudspeaker (particularly for small full range transducers with low X-max - here only 0,15mm) according
BB4 Loudspeaker Analysis
in the attachment a simulated example.
Nearly a perfect Chebyshev roll-off (fifth order)
Here the datasheet of the transducer:

In the moment I am looking to a methody for convert this passive high pass filter network into an active network (MFB, not Sallen-Key).
Where I can find papers, reports, threads and instructions/calculation rules arround this topic?
Thank you for advices.

Last edited by tiefbassuebertr; 7th December 2011 at 08:08 PM.
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Old 4th October 2012, 06:08 PM   #33
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Strange question I know, but would removing the dust cap from this driver make any real difference to the overall sound?
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Old 4th October 2012, 07:47 PM   #34
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Bill, it would very likely roll the top end off, and reduce the control in the bass at the limits.

community sites t-linespeakers.org, frugal-horn.com, frugal-phile.com ........ commercial site planet10-HiFi
p10-hifi forum here at diyA
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Old 4th October 2012, 09:53 PM   #35
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Thanks for the opinion, appreciated.
if removing will roll off the treble maybe I'll use the Omnes 3.01 and remove the phase plugs(replacing them with something else). would like to keep the treble intact..!
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Old 4th October 2012, 10:10 PM   #36
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It's a very sweet driver. One of the better Fostex, I am surprised to say. The only caveat is they are (obviously) limited to a certain maximum SPL when crossed low, but it's a worthy tradeoff for such a sweet sound. (I'm listening to them right now in Blumenstein Orca's.)
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Old 5th October 2012, 02:51 PM   #37
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I'd cross it around 100-120hz I think. Its hard to find a FR this size with decent sensitivity, this is one of about 3.
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Old 5th October 2012, 02:59 PM   #38
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Hi Bill,

I agree, I've found that's the lowest I'm (personally) able to cross it and then distortion / max SPL improves at at 200, 300Hz.
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Old 5th October 2012, 04:45 PM   #39
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Yup, it's kind of a mid tweet. Unique driver like you say Bill. I crossed mine at 450hz. But wanted to really keep it safe.
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