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11th January 2011, 03:27 PM
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#1 |
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diyAudio Member
Join Date: Dec 2010
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Fostex Fe103en Bass Reflex Plans?
I was wondering if anyone knows where I can find some plans for a BR. I've heard mixed things about the fostex recommended specs.
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11th January 2011, 03:54 PM
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#2 |
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diyAudio Member
Join Date: Mar 2005
Location: UK
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Well, the published driver specs. for the En units are supposed to be more accurate than those for the old units. That said, because they are presumably averages, they don't entirely agree, e.g. Vas on the 103 based on the other figures on the sheet should be about 1/2 litre lower than stated.
Anyway, adjusting for that, there are plenty of options. T/S maximally flat is 2.7 litres tuned to 100.6Hz. Keele's alternative alignment = 3.26 litres tuned to 91Hz. And if you have an amplifier with a high output impedance, a Vb = Vas, Fb = Fs alignment should do a decent job. They're not going to have a massive dynamic BW, but for what they are, they should be OK. |
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11th January 2011, 04:03 PM
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#3 |
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diyAudio Member
Join Date: Dec 2010
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Disregard this post, haha.
Last edited by NcHalfrican; 11th January 2011 at 04:15 PM. |
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11th January 2011, 04:12 PM
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#4 |
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diyAudio Member
Join Date: Dec 2010
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Ah ok, thanks for the info! I have one more question, regarding port area. WinISD recommends a 4in/10cm port, which seems a little large, would a 2in/5cm port be adequate?
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11th January 2011, 04:22 PM
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#5 |
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frugal-phile(tm)
diyAudio Moderator
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Here is a 1st pass sim based on factory numbers... doesn't go very low in BR.
dave
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community sites t-linespeakers.org, frugal-horn.com ........ commercial site planet10-HiFi p10-hifi forum here at diyA |
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12th January 2011, 03:24 AM
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#6 |
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diyAudio Member
Join Date: Dec 2008
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12th January 2011, 03:42 AM
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#7 | |
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frugal-phile(tm)
diyAudio Moderator
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Quote:
dave
__________________
community sites t-linespeakers.org, frugal-horn.com ........ commercial site planet10-HiFi p10-hifi forum here at diyA |
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12th January 2011, 04:24 AM
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#8 |
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diyAudio Member
Join Date: Jul 2008
Location: Christchurch
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Droppy as in lack of midbass punch ?
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Sand till the end of time 
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12th January 2011, 05:43 AM
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#9 |
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frugal-phile(tm)
diyAudio Moderator
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It refers to the shape of the roll-off at the bottom. Mid-bass = 40-80 Hz. There is a decided lack.
dave
__________________
community sites t-linespeakers.org, frugal-horn.com ........ commercial site planet10-HiFi p10-hifi forum here at diyA |
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12th January 2011, 06:01 AM
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#10 |
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diyAudio Member
Join Date: Jul 2008
Location: Christchurch
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Righto. I too, prefer the cabinet tuning on your 1st sim.
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