You're welcome!
I tried several different Excel SSs including one of the BIB calculators in an older copy of OO and only the macros didn't work in one of them, so you should have no trouble using any of the BIB SSs.
GM
I tried several different Excel SSs including one of the BIB calculators in an older copy of OO and only the macros didn't work in one of them, so you should have no trouble using any of the BIB SSs.
GM
Hi Loninappleton
I've successfully used GM's calculations (link a couple of posts earlier) in a very noddy Mac spreadsheet, so you can probably download a free or shareware SS for PC from versiontracker.
I've successfully used GM's calculations (link a couple of posts earlier) in a very noddy Mac spreadsheet, so you can probably download a free or shareware SS for PC from versiontracker.
With these tools, it seems odd to me that the Fostex Bib page at Zilla speak doesn't have them posted with the dimensions but just the
raw calculations.
If Jeff didn't want to do all of them perhaps just to post the most frequently used ones could be added.
raw calculations.
If Jeff didn't want to do all of them perhaps just to post the most frequently used ones could be added.
That's because those box dimensions considerably predate the spreadsheets & T/S based alignment GM created.
After reading through the BIB thread all this time, I decided to build a pair for my fe126 drivers. I do not remember the demensions (they took a long time to finish the final stuff, other projects getting in the way) but they are large, and I added a false bottom to get the driver 45" off the floor. They are made from MDF and have about a 12" flat baffle that was cut into a round shape that they are mounted in to give some room behind the driver.
They sound great. The Harveys are going in the garage and I do not know if they are going to be coming back out any time soon. They have better detail, disapear better, and are faster with way better bass. Kick drums and such have more "oomph" that you can feel. The only fault they have is that sometimes they distort at weird times (rarely) when not even being pushed very hard, and there is sometimes an underlying weird sound like maybe form of distortion. I am assuming that is due to there not being eneough pressure behind the driver to help keep it in control. I am going to build a compression chamber next to see if that fixes the problem. I will just build a quick frugel-horn compression chamber and see what that does.
Stuffing is in the narrow part above the driver and in the top near the exit. I may need to put more in, that weird sound may be too much highs coming from the top. I am really happy with them and have not even tweaked them yet.
Ed Robinson
They sound great. The Harveys are going in the garage and I do not know if they are going to be coming back out any time soon. They have better detail, disapear better, and are faster with way better bass. Kick drums and such have more "oomph" that you can feel. The only fault they have is that sometimes they distort at weird times (rarely) when not even being pushed very hard, and there is sometimes an underlying weird sound like maybe form of distortion. I am assuming that is due to there not being eneough pressure behind the driver to help keep it in control. I am going to build a compression chamber next to see if that fixes the problem. I will just build a quick frugel-horn compression chamber and see what that does.
Stuffing is in the narrow part above the driver and in the top near the exit. I may need to put more in, that weird sound may be too much highs coming from the top. I am really happy with them and have not even tweaked them yet.
Ed Robinson
If someone takes the time to input all the specs i will post screenshots of all the dims... or put up the most current dims.
Peace,
Godzilla
Peace,
Godzilla
Scottmoose said:
I can take care of some of the less popular (but documented) ones, then...
If someone sends me a wish list, just not to overlap with Scott, I'll generate the dims...
Gastón
ghpicard said:
Now I'm assuming we are talking about dims=dimensions.
I do my simulations with AkAbak and some different assumptions, and I get different results than what I see in Jeff's pages. Until I can check them (as in measure and contrast at least against my BIB166), I'd rather not release the sims, in order not to create unneeded confusion.
Gastón
I'm back 🙂 With some (nice) results, I should hope 🙂
Here's my take on bib with fe126e. No folding, just a straight pipe, with L=~2.5m.
The bottom part of the horn is inverted, so that the front baffle stays vertical. Behind internal baffle is an empty space filled with sand bags (for the sake of center of mass, if nothing else).
Just in case, they are fixed at the top to the back wall with thick bolts (used for fixating water heaters normally 🙂 ), so there should be no nasty surprises
Material is MDF (thickness 19mm). Natural oak veneer, and linseed oil finish.
so guys... what do you think?
cheda
Here's my take on bib with fe126e. No folding, just a straight pipe, with L=~2.5m.
The bottom part of the horn is inverted, so that the front baffle stays vertical. Behind internal baffle is an empty space filled with sand bags (for the sake of center of mass, if nothing else).
Just in case, they are fixed at the top to the back wall with thick bolts (used for fixating water heaters normally 🙂 ), so there should be no nasty surprises
Material is MDF (thickness 19mm). Natural oak veneer, and linseed oil finish.
so guys... what do you think?
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An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
cheda
Awesome dude! But 'pretty' is as 'pretty' does, meaning are they just another pretty 'face' or do they perform as good as they look?
GM
GM
They work quite nicely, with some still unresolved issues 🙂
Firstly I built an inverted version, as drawn by planet10 if I recall correctly. Then i decided to try this version because it takes up less space in a room, and my ceiling is so high (3.8meters), that higher is better in my case (HiB BiB 🙂 )
Side by side there wasn't much of a difference between the iBib and this one, so I went on. The main difference was caused by the height at which the driver sat (much higher on iBIB)
Soon, I will get in a possession of some measuring equipment, and then I will see what I've really got on my hands.
There is a lack of bass output under ~200Hz region, like a 4-6dB step down filter, but I can't be sure until I see it on a graph 🙂
I don't have a "supra baffle" so it could be that, or it could just be the height of the mouth. Also it could be the damping, which I don't now just how to put until I have some measurements to go by.
Any opinions would be very helpful.
Firstly I built an inverted version, as drawn by planet10 if I recall correctly. Then i decided to try this version because it takes up less space in a room, and my ceiling is so high (3.8meters), that higher is better in my case (HiB BiB 🙂 )
Side by side there wasn't much of a difference between the iBib and this one, so I went on. The main difference was caused by the height at which the driver sat (much higher on iBIB)
Soon, I will get in a possession of some measuring equipment, and then I will see what I've really got on my hands.
There is a lack of bass output under ~200Hz region, like a 4-6dB step down filter, but I can't be sure until I see it on a graph 🙂
I don't have a "supra baffle" so it could be that, or it could just be the height of the mouth. Also it could be the damping, which I don't now just how to put until I have some measurements to go by.
Any opinions would be very helpful.
I am not 100 percent certain but i think you may also be able to roll some drivers in that cabinet if you decide to build a baffle. I think the 127e and the 4 inch Tangband Bamboo driver also work in the same (or similar enough) sized BIB. If you feel the 126e does not give you the sound you want maybe one of these other drivers will.
They do look amazing!
Godzilla
They do look amazing!
Godzilla
I'm not sure about the tang band because it's much less sensitive (89dB if I am not mistaken).
Amp that is currently in plans and "parts slowly gathering" stage is 45 set, so 1.5W on 89dB won't be enough.
maybe I'll try fe127, eventually, but I will first try to solve my problem with correct damping, baffle and maybe some deflectors on the ceiling.
Thanks for suggestion
Amp that is currently in plans and "parts slowly gathering" stage is 45 set, so 1.5W on 89dB won't be enough.
maybe I'll try fe127, eventually, but I will first try to solve my problem with correct damping, baffle and maybe some deflectors on the ceiling.
Thanks for suggestion
Back in my pvc experimenting days I set up a tube that was 80 in long straight up to the ceiling. Well not straight. it was F shaped with the driver at 40 in or so at a T joint and then the elbow at the top.
Pipe organ concerts are pretty amazing. This build reminded me of that and put me to wondering what folding actually _does_.
Pipe organ pipes are not folded and from listening I heard a distinct advantage in straight up.
But it's an architectural as well as a design consideration.
The suggestion was made at the time that a wall hung 'pan pipe' arrangement could be worked out and be sort of artistic as well.
I did not pursue it.
Craft work looks really well done.
🙂
Pipe organ concerts are pretty amazing. This build reminded me of that and put me to wondering what folding actually _does_.
Pipe organ pipes are not folded and from listening I heard a distinct advantage in straight up.
But it's an architectural as well as a design consideration.
The suggestion was made at the time that a wall hung 'pan pipe' arrangement could be worked out and be sort of artistic as well.
I did not pursue it.
Craft work looks really well done.
🙂
You might be surprised how long that 'pan-pipe' idea has been around. See the attached, from Paul Voigt's 1936 patent. There really is nothing new under the sun.
Folding a pipe will help attenuate some HF leakage, which is good. They can also, say, allow you to fit your FE206E or FE208ESigma BIB into the average sized room, without needing to rip the ceiling out. 😉 I should find this out myself at some point.
On the negative side, folds can also cause reflections back along the path, which will show up on an impedance curve, as well as in the FR. Same applies to other types of BLH of course, not just pipe-horns.
Folding a pipe will help attenuate some HF leakage, which is good. They can also, say, allow you to fit your FE206E or FE208ESigma BIB into the average sized room, without needing to rip the ceiling out. 😉 I should find this out myself at some point.
On the negative side, folds can also cause reflections back along the path, which will show up on an impedance curve, as well as in the FR. Same applies to other types of BLH of course, not just pipe-horns.
Attachments
Scottmoose said:
some people swear by the Voigt pipe (for 8" mostly) and I was going to build that way but don't have BOFU's or equivalent cheap 8".
I do have a pair of 8" that have whizzers and were on deal as remainders from Roland electronic keyboard mfg. $16 for 2 plus shipping I think. They are on the shelf. I have no T/S on them.
The Lowther Club of Norway Voigt Pipe, like the BIB, is (loosely) connected to Paul Voigt, but like any enclosure, you'd have to re-design & optimise it for a specific drive-unit if you want half decent performance out of the thing.