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Old 11th January 2011, 03:27 PM   #1
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Default 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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Old 11th January 2011, 03:54 PM   #2
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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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Old 11th January 2011, 04:03 PM   #3
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Disregard this post, haha.

Last edited by NcHalfrican; 11th January 2011 at 04:15 PM.
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Old 11th January 2011, 04:12 PM   #4
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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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Old 11th January 2011, 04:22 PM   #5
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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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File Type: gif FE103En-BR-sim.gif (26.1 KB, 230 views)
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Old 12th January 2011, 03:24 AM   #6
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Would this work?

Humble Homemade Hifi
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Old 12th January 2011, 03:42 AM   #7
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Quote:
Originally Posted by chromenuts View Post
Would this work?

Solo103
A bit droopy for my taste, but you see alot of alignments like this.

dave
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File Type: gif FE103En-Solo103-sim.gif (18.3 KB, 188 views)
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Old 12th January 2011, 04:24 AM   #8
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Droppy as in lack of midbass punch ?
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Old 12th January 2011, 05:43 AM   #9
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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
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Old 12th January 2011, 06:01 AM   #10
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Righto. I too, prefer the cabinet tuning on your 1st sim.
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