Fostex FP203 BL-Horn - diyAudio
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Old 26th September 2005, 07:25 PM   #1
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Default Fostex FP203 BL-Horn

Hi @ll


I have designed a BL-Horn for the FP203.


The chamber is about 60ltr big, but I will have to reduce it a bit untill I get the sound I am looking for.


here are the datas for the Horn:


Am = 80x40 = 3200 cm²
Ah = 3.5x40 = 140 cm²
lenght = 1.1 m
chamber = < 60ltr
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Old 26th September 2005, 07:30 PM   #2
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here is the plan
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Old 26th September 2005, 07:32 PM   #3
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build the horn
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Old 26th September 2005, 07:34 PM   #4
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the two horns in my living room
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Old 26th September 2005, 08:20 PM   #5
hilbren is offline hilbren  Netherlands
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wow that are some nice looking horns.

nice frequentie response!
I saved the drawings just in case
(Im actually an esl person)
Do you have a waterfall diagram??
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Old 26th September 2005, 09:30 PM   #6
Rudolf is offline Rudolf  Germany
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Congratulations, Till

I didn´t expect to see you reacting that fast. Did you have a deal with Mr. Zetsche?

I looked up the dimensions for the original recommended BL horn for the FP203 aka BK 201. They add up to almost exactly 0.1 m³ volume. The new horn is 0.25 m³!! Size SEEMS to matter after all

Does the sound live up to your expectations so far? (I know you are still going to optimise it). The response diagram looks very promising.

Seeing the FP203s sitting next to your beautiful big horn makes me wish to see them in some adequate enclosure too.

Thanks for your efforts!

Rudolf
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Old 28th September 2005, 06:34 AM   #7
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Hi Hilbren

up to now I haven’t got any measurements done. But maybe I will get the chance end of this week. As soon as I got some diagrams I will post them.




Hi Rudolf,

The horn sounds quite good but not as deep as the FX200 Horn. Ok the direct comparison is a bit unfair. The parameters from the FX200 are for my way of constructing a horn better.

Qts between 0,4 and 0,6
fs round 30 – 40Hz

- FX200 (Qts=0,45; Vas=82 ltr; fs=38 Hz)
- FP203 (Qts=0,18; Vas=81 ltr; fs=40 Hz)



But lets get first to the my room. It is too big for the FP203-Horn and I have to place it near in the middle of the room. The FP203-Horn should be placed nearer to a rear wall or even better direct to a corner. Reason is that the bass is not strong enough.
I will change the position of the FX and the FP today to see what happens. The “outline” or “contour” of the bass is really nice. You can hear all details and always have the feeling that the driver has everything under control.
The most important part for me is the midrange (voices). Here I will have to optimise the volume. The basis is good, very good. I will write more as soon as I will know how I will have to change the volume.
The details of the high frequency-area are ok but I don’t like the increase SPL of the driver. Here I will have the most work with. Right now I play with ~2,2µF and ~7Ohms parallel to the driver. Hope I will get better results and of course I will inform you as soon as I have news.

All over it looks like the construction will work.




cya Till
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Old 18th September 2008, 07:28 AM   #8
es44 is offline es44  Denmark
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I know this is an old thread, but i'm curious to hear what became out of this ?
I have a chance to get myself a pair of 203 right now for the price of ~200 $, and would like to get my feet wet
Please note, that i have no experience what so ever with speakerbuilding (yet).

Best regards
Ebbe
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Old 19th September 2008, 10:08 PM   #9
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Hi Ebbe,


200 $ is ok for the FP203.
I would take an other driver if you haven’t got any experience. The 203 is a bit difficult to get it smooth.

What do you want to build? What are your ambitions?


best regards Till
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Old 19th September 2008, 10:45 PM   #10
es44 is offline es44  Denmark
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Hi Till. Thanks for answering.

Frankly, i don't really know what it is i'm after, i just want to make one set of speakers in my lifetime .
(others than those i made in the 70-ties)
One thing i'm sure of, and that is, it's going to be a full-ranger. I read a lot about the wonders of those, and i want to hear them. The Spawn family looks very interesting, and i beleive that it will be one of them i will end up with.
I can understand that i better keep my hands off the 203, as it would be a shame to waste my money on something i probably never will get right.

Oh well, hopefully i still have time left to fullfill my dream, hehe.

Best regards
Ebbe
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