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2nd November 2017, 11:52 PM  #11  
frugalphile(tm)
diyAudio Moderator

Quote:
dave
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3rd November 2017, 04:05 AM  #12 
diyAudio Member
Join Date: Feb 2012
Location: Tulsa, OK

giantstairs: by unfolded pipe, do you mean something like a Voigt pipe?
chrisb: I'd really love to do a pair of VampyrVs but, realistically, would need more builds under my belt before attempting those fine angles and particularly the holey braces at the ends. planet10: so with what you're suggesting, could I use the BIB calculation for the FE103sol from Zilla's spreadsheet, but simply turn the enclosure upside down and place the driver at L*0.416? 79.203 x 0.416 = 32.95" off the ground? Like this?: http://frugalphile.com/boxlib/iBIBk...map060307.pdf 
3rd November 2017, 04:11 AM  #13 
frugalphile(tm)
diyAudio Moderator

A BIB is a Voigt Pipe.
Yes, you can use the alternate Zd calculation to get the driver into a more useful position. It should work folded or unfolded. All the same numbers as you have except the Zd. Yes, like the iBIBk. dave
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3rd November 2017, 04:12 AM  #14 
diyAudio Member
Join Date: Feb 2012
Location: Tulsa, OK

Would iBIBk be suitable for placement near corners?
Have you built it, and if so, what did you think of the sound? 
3rd November 2017, 04:14 AM  #15 
frugalphile(tm)
diyAudio Moderator

Corners are better than not.
I’d not guess. I know the FE103 SOL sounds good — at least in FH3. dave
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3rd November 2017, 08:48 AM  #16 
diyAudio Member
Join Date: Sep 2005

I have built both upward and downward firing BIBs. I prefer the upward, hence my unfolded suggestion. In the big thread I remember at least one example with a photo.
I would use your numbers but increase the height to 92” or so, width and depth the same, zdriver at 0,416 or 0,5 (whichever you prefer) and shove them right in the corners. Depending on your amp you may even want to push up the qts to make them even bigger. GM explained all this back in the main thread, perhaps he will chime in. Simple and should have lots of bass gain. 
3rd November 2017, 02:19 PM  #17 
diyAudio Member
Join Date: Feb 2012
Location: Tulsa, OK

Thanks giantstairs. I was thinking about an upward firing unfolded BIB last night and really like the idea, as they'd be a slim fit right in the corners and the driver would be at a pretty good level for when I'm sitting at my desk.
So with a ceiling height of 96" and pushing the cabinet height to 92", that leaves only 4" of space between the horn opening and the ceiling. That's enough? I've been looking for formulae in the literature for determining distancetoboundaries in a BIB. 
5th November 2017, 03:54 PM  #18 
diyAudio Member
Join Date: Feb 2012
Location: Tulsa, OK

All those years of wondering whether the Pythagorean theorem would ever become useful in my daily life finally have their answer. Out of curiosity, I sat down to figure out the enclosure dimensions of an unfolded, upward firing BIB for FE103sol using the numbers from the spreadsheet formula and, since I was a humanities major, would appreciate feedback as to whether I'm going about this correctly (manual work attached).
L travels down the center of the horn and is 79.2" Interior depth = 8.186" Interior width = 5.788" To figure out the interior front and rear baffle lengths, we can use Pythagorean theorem since the enclosure interior is a right triangle: a = front baffle (unknown length) b = horn opening depth (8.186") c = hypotenuse or rear baffle (unknown length) L = a line from the horn point to the halfway point of b (79.2") a^2 + b^2 = c^2 For the first calculation, we assume a right triangle using L as hypotenuse. That means b is half of the interior depth from the spreadsheet, or 4.093" * a^2 + 4.093^2 = 79.2^2 * a^2 + 16.75 = 6272.64 * a^2 = 6255.89 *a = 79.09 Now that we know the front baffle interior is 79.09", we can solve for the rear baffle by using the info from the original right triangle (where b = 8.186") *79.09^2 + 8.186^2 = c^2 *6255.23 + 67.01 = c^2 * 6322.2381 = c^2 * 79.5125 = c Using our preferred formula for Zd (Zd = L * 0.416), that gives a driver height of 32.95" (interior), which isn't bad. Being realistic, let's say I use 3/4" nominal (0.703" actual) plywood, plus let's say 3/4" floor spikes on the enclosure bottom, that gives us a cabinet height of roughly 80.5". Ceiling height is 96" so (80.5") that leaves 15.5" of space between horn opening and ceiling. Is that too much? Last edited by jdrouin; 5th November 2017 at 04:06 PM. 
5th November 2017, 06:14 PM  #19 
frugalphile(tm)
diyAudio Moderator

Given that a BIB goes to a point it is fairly easy. Length is what the SS spits out. Top is the same WxD dimensions as the SS gives. The other end is a point, ie =0. Zd is from the pointy end.
dave
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5th November 2017, 06:43 PM  #20 
diyAudio Member
Join Date: Feb 2012
Location: Tulsa, OK

Just to be clear, length (L) is the median path down the horn, not baffle length, correct?
I entered manufacturer specs for FF105WK into the spreadsheet, which resulted in a longer L and taller cabinet  about 91 inches built, with just under 5" gap between horn mouth and ceiling. Here are some rudimentary toscale drawings (more or less) of BIBs inroom for FE103sol and FF105WK. FE103sol (could be raised by adding to base) * Zheight = 34.45" * clearance horn mouth to ceiling = 15.5" FF105WK *Z height = 38.8" * clearance horn mouth to ceiling = 4.87" How do these seem to the members here? I will start working on iBIB drawings this evening. Last edited by jdrouin; 5th November 2017 at 06:46 PM. 
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