Terry Cain's BIB -why does it work and does anyone have those Fostex Craft Handbooks? - Page 459 - diyAudio
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Old 26th August 2009, 01:18 AM   #4581
Ian444 is offline Ian444  Australia
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Quote:
Originally Posted by crappyjones123 View Post
any thoughts on question 1/3?
cj,

Hardware - you didn't mention the screws to hold the drivers in.

Re stuffing -
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Ian.
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Old 26th August 2009, 01:38 PM   #4582
croat47 is offline croat47  United States
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In using the sheets: if you wanted to build a 1.5 or MTM BIB, would you just double the VAS for the drivers if driven in parallel? This doubles the volume of the box but keeps the expansion and length the same based on Fs and Qts, correct?
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Old 26th August 2009, 04:45 PM   #4583
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Right. Impedance etc. also change but that doesn't affect Vp or Fp.
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Old 26th August 2009, 08:00 PM   #4584
croat47 is offline croat47  United States
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Great. Thought is along the lines of Jim Griffin's offset MLTL that he derived from AudioKinesis' DreamMaker conept. For a small driver like the B3S or RS125, could you do a bipolar iBIB with the front driver at ear height (0.41*L) and the rear at a lower position (0.21*L). The drivers would have to be on the "depth"/long sides and offset towards one side. But, would allow moving the speaker off the wall yet avoid need for BSC.

Thoughts? Build it and see? Or is the spacing too large for this idea. 0.21 and 0.41 heights would be 13" apart for the B3S version.
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Old 26th August 2009, 08:18 PM   #4585
GM is offline GM  United States
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Ideally you want them <1/4 WL apart through the XO BW, but this means a near bipolar layout for all but the lowest point/highest order XOs, so 1 WL/XO point is the accepted limit: ~13560/4/13 = ~261 Hz upper limit and the lower the better.

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Old 27th August 2009, 03:18 PM   #4586
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any thoughts on an iBIBk for the FE87E? Using the BIB calculator i got prety small box. approx 7"x9"x24". the zdriver was about 10". could be a nifty little desktop speaker if pushed up against a wall.
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Old 27th August 2009, 05:21 PM   #4587
GM is offline GM  United States
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Don't see why not, awhile back a local was using small 126?/127? floor loaded BIBs in his office and once backed up against the wall on the ends of a large 'V' corner desktop they came 'alive' within their design limitations.

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Old 27th August 2009, 10:11 PM   #4588
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or how about a floorstander at 48" (no fold) spaced up a few inches off the floor, against a wall? i put together a double folded, floor loaded fe108ez and wish it were taller. getting some serious bass though.
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Old 28th August 2009, 12:20 AM   #4589
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i just thought it would be kinda cool to have a desktop sized bib. i got some peerless csx 8 inchers that i could use to make a "sub" and have myself a pretty unique 2.1 system. i just dont know if my marantz 2216 or gainclone will play nice with a fostex. they both play nice with vintage 70s AAL speakers.
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Old 28th August 2009, 01:20 AM   #4590
CLS is offline CLS  Taiwan
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You forget BIB is "Bigger Is Better". How can a normal desktop space accommodate that properly?

Maybe the pipe(s) can form a large frame and wrap around the desk, or folded to form a thick wall then put in front of the desk. However those are not desk 'top'.
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