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e_fortier 30th January 2009 02:13 AM

FE206E BIB short version (140 inches)

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,

freddi 30th January 2009 03:51 AM

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

freddi 30th January 2009 04:29 AM

and here's the sim again with wider view of response plus I corrected the max spl to 1.5mm xmax

Z-out 0-2-4 & 12 ohms

Vix 30th January 2009 07:23 AM

I was looking at the data about Fe206E Bib, and there's something confusing:

If you look here:

you'll see that Sm=133.875

On the other hand, if you look at the vaules at the Bib calculator, here:

for Fe206E, Sm=90.606

Which one is correct?



Scottmoose 30th January 2009 08:35 AM

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.

Vix 30th January 2009 11:01 AM

Thanks Scottmoose,

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



Scottmoose 30th January 2009 11:56 AM

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.

Vix 30th January 2009 12:44 PM

Thanks! :cool:

Godzilla 30th January 2009 08:51 PM

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!

e_fortier 1st February 2009 03:23 AM


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 ;)


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