Zilla
Can you give the placement Dims for the internal baffle,
does it butt against inside front at top, and center up at the bottom,also how far is that board from bottom of enclosure.
are the dims on your illustration inside or outside measurements.
Can you give the placement Dims for the internal baffle,
does it butt against inside front at top, and center up at the bottom,also how far is that board from bottom of enclosure.
are the dims on your illustration inside or outside measurements.
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>>> Can you give the placement Dims for the internal baffle, does it butt against inside front at top, and center up at the bottom,also how far is that board from bottom of enclosure. are the dims on your illustration inside or outside measurements.
The inside baffle is 46.5" long. Yes, it butts at the top (i went heavy on the glue and clamped to dry) and centers at the bottom something like 4.25" on each side/up from the bottom. Measure twice! Cut once! The center of the driver is down 20" from the top of the cabinet.
>>> I haven't even finished my EL70 iBiB's yet and I'm tempted to build these!! Under $20 a driver is a bargain
Well, i have not heard the EL70 but it must be somewhat better than the Dayton. The question is 'How much better?' In a small ported box tuned to 75hz the little Dayton was not impressive. In fact, i abandoned it's bigger brother (a 6.5" Dayton that requires a tweeter) bc i could not stand listening to it. The 5" Dayton comes to life in the BIB. It's not that much worse than the 'sweeter' sounding and more expensive Fostex 127e (I have future plans for this driver) and really gels in the BIB. The output out the top of the BIB really gels with the driver and rounds out the overall sound. It's not as detailed or delicate as the Fostex but the detail is there if you choose to listen for it. It just sounds very pleasant with a bit of a robust personality. This is one of the few projects i'd build again. It's a small inexpensive driver in a slim cab that sounds three times its size. It sounds like a ten inch woofer is hiding somewhere in the box. I look forward to cranking them up later this evening when i get back from the dentist and before leaving for krav maga! Btw, this is not even the optimal size for this driver according to the BIB spreadsheet. I built this BIB as a compromise to roll drivers in and out... I also have the 4" TB bamboo driver to try... unfortunately it requires a different hole size. I may not try it at all i am enjoying these so much. And don't forget, a tweeter can be added to improve the treble... i just have not had time to get to it.
Zilla
The inside baffle is 46.5" long. Yes, it butts at the top (i went heavy on the glue and clamped to dry) and centers at the bottom something like 4.25" on each side/up from the bottom. Measure twice! Cut once! The center of the driver is down 20" from the top of the cabinet.
>>> I haven't even finished my EL70 iBiB's yet and I'm tempted to build these!! Under $20 a driver is a bargain
Well, i have not heard the EL70 but it must be somewhat better than the Dayton. The question is 'How much better?' In a small ported box tuned to 75hz the little Dayton was not impressive. In fact, i abandoned it's bigger brother (a 6.5" Dayton that requires a tweeter) bc i could not stand listening to it. The 5" Dayton comes to life in the BIB. It's not that much worse than the 'sweeter' sounding and more expensive Fostex 127e (I have future plans for this driver) and really gels in the BIB. The output out the top of the BIB really gels with the driver and rounds out the overall sound. It's not as detailed or delicate as the Fostex but the detail is there if you choose to listen for it. It just sounds very pleasant with a bit of a robust personality. This is one of the few projects i'd build again. It's a small inexpensive driver in a slim cab that sounds three times its size. It sounds like a ten inch woofer is hiding somewhere in the box. I look forward to cranking them up later this evening when i get back from the dentist and before leaving for krav maga! Btw, this is not even the optimal size for this driver according to the BIB spreadsheet. I built this BIB as a compromise to roll drivers in and out... I also have the 4" TB bamboo driver to try... unfortunately it requires a different hole size. I may not try it at all i am enjoying these so much. And don't forget, a tweeter can be added to improve the treble... i just have not had time to get to it.
Zilla
Zilla,
Have you ever experimented with displacing the angled internal baffle rearwards rather than spacing the drive unit forwards? ie, having the taper terminating at say an inch wide rather than reducing to zero in width?
It would reduce the angle of the quarter wave taper, I'm just curious as to what effect this might have/does have.
Have you ever experimented with displacing the angled internal baffle rearwards rather than spacing the drive unit forwards? ie, having the taper terminating at say an inch wide rather than reducing to zero in width?
It would reduce the angle of the quarter wave taper, I'm just curious as to what effect this might have/does have.
>>> having the taper terminating at say an inch wide rather than reducing to zero in width?
>>> It would reduce the angle of the quarter wave taper, I'm just curious as to what effect this might have...
hmmm, i wonder how much difference it would make if any at all if instead of bringing to a point we 'space back' and add .75"... keeping the inner baffle centered at the bottom like usual. It would eliminate the suprabaffle in many cases.
>>> It would reduce the angle of the quarter wave taper, I'm just curious as to what effect this might have...
hmmm, i wonder how much difference it would make if any at all if instead of bringing to a point we 'space back' and add .75"... keeping the inner baffle centered at the bottom like usual. It would eliminate the suprabaffle in many cases.
Drew, being that the BIB is so forgiving to begin with i'd imagine the sonic differences would be minute. I always fix the inner baffle in place before test mounting the driver. Each time i had to double up the front to create enough space for the magnet.
btw, Terry Cain really liked the 168 sigma in BIBs.
btw, Terry Cain really liked the 168 sigma in BIBs.
My site is temporarily down bc i am moving it to GoDaddy. It should be up in a couple of days. I tried to attach the BIB Calculator to this post but it's telling me the Excel file is an invalid file. Sorry. Please give it another day or two. I will call GoDaddy today to see what the delay is.
Zilla
PS. If anyone wants the BIB Calculator emailed to them feel free to send me an email at ZillaSpeakers@gmail.com.
Zilla
PS. If anyone wants the BIB Calculator emailed to them feel free to send me an email at ZillaSpeakers@gmail.com.
Hi,
Just wanted to say that Box.net is good for this type of situation: https://box.net/ (It's $0 for any reasonable amount of data.)
I'm getting some strange results from box.net about security. But I'm also looking for a simple calculator to get a port length for an old driver.
Please give a direct link to this freeware download.
I was able to crank it out by hand and believe me, if I can do it anyone can. I've rewritten the formulas to make them (hopefully) more clear. Hope this helps someone somewhere.
L=13560/Fs/2
zdriver=L *.217
Vb=(20*Vas)*Qt^1.25
Folded Height=L/2
Sm=(Vb*1728)/Folded Height
Depth=SQRT((SQRT2)*Sm)
Width=Sm/Depth
A-B-C=Depth/2
L=13560/Fs/2
zdriver=L *.217
Vb=(20*Vas)*Qt^1.25
Folded Height=L/2
Sm=(Vb*1728)/Folded Height
Depth=SQRT((SQRT2)*Sm)
Width=Sm/Depth
A-B-C=Depth/2
MJK BIB calculator
Hi, I haven't had the time to read all the entire thread, so my apologies if this has already been covered... but has anyone here used MJK (Martin J King)'s simulators for the BIB?
They're generally fairly accurate predictors for in-room performance for TL's, Bass reflex, TQWMLTL and OB's, as well as horns... so there's a pretty good chance they'll do well with BIB also.
If so, they'd be a real boon to those that want to build and experiment with BIB
Martin asks for a VERY reasonable $25 to access his worksheets, and they're pretty easy to use. Highly recommended.
Check Quarter Wavelength Loudspeaker Design
Hi, I haven't had the time to read all the entire thread, so my apologies if this has already been covered... but has anyone here used MJK (Martin J King)'s simulators for the BIB?
They're generally fairly accurate predictors for in-room performance for TL's, Bass reflex, TQWMLTL and OB's, as well as horns... so there's a pretty good chance they'll do well with BIB also.
If so, they'd be a real boon to those that want to build and experiment with BIB
Martin asks for a VERY reasonable $25 to access his worksheets, and they're pretty easy to use. Highly recommended.
Check Quarter Wavelength Loudspeaker Design
Hmm, wonder which specs are more accurate, the current published ones or the measured ones from 2003 that specs a ~32% smaller net Vb/~2 Hz lower tuning, he ~rhetorically asks? Regardless, BIB rules when specs are 'unknown' and since current measured specs typically require an even larger cab, the BIB's built in fudge factor should be fine with the current published specs.
With such a short folded height, either floor loading or building it as an inverted straight pipe spaced up to get the driver up high enough are the two tried n' true ways, but with such a high Fs there's another alignment I've suggested, but AFAIK no one has been willing to gamble on it.
Copy/paste from my original Excel SS:
height (in) 74.508
depth (in) 6.537
width (in) 4.622
A-B-C (in) 3.268
driver offset (in) 32.337
driver offset - sub (in) 64.673
driver height (in) 42.922
driver height - sub (in) 10.585
L (in) 149.017
Sm (in^2) 30.216
net Vb (ft^3) 1.30286
baffle thickness (in) 0.750
zdriver 0.217
zdriver - sub 0.434
Fs 45.178
Vas (ft^3) 0.1589
Qts 0.49
SoS (in/sec) 13464.54
Basically, it's tuned to a 1/2 WL of the driver's calculated FLc. Not knowing for sure how well loaded it will be in-room, some form of EQ may be required to protect the drivers below ~40-50 Hz, but to my way of thinking it's a small price to maybe pay for the ease of build and tiniest practical 'footprint'.
GM
With such a short folded height, either floor loading or building it as an inverted straight pipe spaced up to get the driver up high enough are the two tried n' true ways, but with such a high Fs there's another alignment I've suggested, but AFAIK no one has been willing to gamble on it.
Copy/paste from my original Excel SS:
height (in) 74.508
depth (in) 6.537
width (in) 4.622
A-B-C (in) 3.268
driver offset (in) 32.337
driver offset - sub (in) 64.673
driver height (in) 42.922
driver height - sub (in) 10.585
L (in) 149.017
Sm (in^2) 30.216
net Vb (ft^3) 1.30286
baffle thickness (in) 0.750
zdriver 0.217
zdriver - sub 0.434
Fs 45.178
Vas (ft^3) 0.1589
Qts 0.49
SoS (in/sec) 13464.54
Basically, it's tuned to a 1/2 WL of the driver's calculated FLc. Not knowing for sure how well loaded it will be in-room, some form of EQ may be required to protect the drivers below ~40-50 Hz, but to my way of thinking it's a small price to maybe pay for the ease of build and tiniest practical 'footprint'.
GM