FE206E BIB short version (140 inches) - diyAudio
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Old 30th January 2009, 02:13 AM   #1
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Default FE206E BIB short version (140 inches)

Hi,

I'm looking for the frequency response of the shortest verion of the 206e bib, has it been publish yet ?

The longer one is impressive with a -3db at 30Hz but the shorter one would be more WAF

Thanks in advance,
Eric
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Old 30th January 2009, 03:51 AM   #2
freddi is offline freddi  United States
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here's a simulation in AJ-Horn - for spl vs xmax limits I had xmax listed as 1mm instead of 1.5mm. It would reach 1mm by ~1.2 watts or so around 40Hz

http://img220.imageshack.us/img220/9...bib206eya8.gif
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Old 30th January 2009, 04:29 AM   #3
freddi is offline freddi  United States
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and here's the sim again with wider view of response plus I corrected the max spl to 1.5mm xmax

http://img220.imageshack.us/img220/7...06e15mmak4.gif

Z-out 0-2-4 & 12 ohms

Click the image to open in full size.
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Old 30th January 2009, 07:23 AM   #4
Vix is offline Vix  Yugoslavia
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I was looking at the data about Fe206E Bib, and there's something confusing:

If you look here:

http://www.zillaspeak.com/bib-fostex.asp

you'll see that Sm=133.875

On the other hand, if you look at the vaules at the Bib calculator, here: http://www.zillaaudio.com/bib-calculator.htm

for Fe206E, Sm=90.606

Which one is correct?

Thanks

Vix
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Old 30th January 2009, 08:35 AM   #5
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Neither. As has been pointed out in the past, many (most) of the dimensions listed on Jeff's site pre-date the T/S alignment used in the Excel sheets. They'll still work happily enough, but the LF alignment may be slightly different.
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Old 30th January 2009, 11:01 AM   #6
Vix is offline Vix  Yugoslavia
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Thanks Scottmoose,

Then, which one (BIB calculator) should we take? Sorry for a dumb question, maybe I missed something...

Regards,

Vix
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Old 30th January 2009, 11:56 AM   #7
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Whichever you like. There is no right or wrong (within reason). The BIB calculators provide a specific alignment, but you don't have to use it.
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Old 30th January 2009, 12:44 PM   #8
Vix is offline Vix  Yugoslavia
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Thanks!
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Old 30th January 2009, 08:51 PM   #9
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I know someone that built both the short and longer BIB for the 207e and loves them both. I guess it depends on your room/ceilings but either one should be great. Even if you built one with a line somewhere in between the short and long you would have a great sounding speaker IMO. The BIB is forgiving and the charts will reflect that. The longer line will have deeper bass, otherwise you get the other BIB advantages like large imaging, dynamic sound, efficiency, easy corner placement, etc...

OT... This week i cut holes for 15 inch Eminence Alpha's... will glue up the H frames and connect over the weekend maybe... can't wait to see how they enhance my BIBs using 6.5 inch Fostex drivers... Amazing how i need two 15" pro drivers to enhance the bottom octaves of my BIBs... I can't wait!
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Old 1st February 2009, 03:23 AM   #10
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Hi,

Thanks to all for the answer.

I just checked and the ceiling in the basement (where my HT is located) is 80.5 inches (205cm) high.

How much distance do you need from the top of the BIB to the ceiling so the coupling of the horn's mouth has a nice transition to the ceiling.

I just want to make sure I get the maximum from this BIB based on the dimensions I have.

Is it worthed to make it lets say 150 inches instead of 140 to get a little more bass or is this irrelevant.

Thanks for the help

Eric
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