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Old 8th February 2013, 10:01 PM   #1281
xrk971 is offline xrk971  United States
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There aren't any dims in other thread just drawing w/o dims.
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Old 8th February 2013, 10:30 PM   #1282
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Quote:
Originally Posted by Cal Weldon View Post
I wonder if it would work.
In concept, I don't see why not, though being a TH it really needs to be simmed in HR as some isobarically loaded TH sims I've done made for too high a compression ratio to even fit the driver inside, much less be able to handle much power without heavily distorting or maybe even ripping it apart.

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Old 10th February 2013, 03:55 PM   #1283
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Quote:
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heavily distorting or maybe even ripping it apart.
Hey it's all in fun.
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Old 10th February 2013, 03:57 PM   #1284
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Next idea is along the lines of daisy but as a Pentagon. Quick sketch is easy, real drawing, well, we'll see.
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Old 10th February 2013, 07:56 PM   #1285
xrk971 is offline xrk971  United States
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Quote:
Originally Posted by Cal Weldon View Post
Next idea is along the lines of daisy but as a Pentagon. Quick sketch is easy, real drawing, well, we'll see.
Nice design Cal. You are a pretty good artist!
How big is this, what size driver, how long are channels? Don't forget that you can curve mouth.
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Old 10th February 2013, 08:32 PM   #1286
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OK, more to scale, I found this may or may not work. For the expansion needed, the 'petals' have to be wider like in this diagram so I'm not sure how the mouth flare is going to work. The actual change in the angles with be rounded not sharp as drawn but that seems to change rather quickly right at the mouth. As far as size goes, it's scalable like the other designs but I notice this has a much larger chamber and shorter horn lentghs. They seem to be about half of what the spiral offers. Right now the throat atarts at 1" and exits into the mouth horn at around 2.5" (pentagon - 32" flat to tip.)

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Old 11th February 2013, 01:39 AM   #1287
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A photo of the Vifa tc9fd 20" with 1/2" birch ply/foamcore hybrid that I gave to a buddy. They look really nice on the wall. We listened to some great music today!

Thanks xrk!


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Old 11th February 2013, 04:09 AM   #1288
xrk971 is offline xrk971  United States
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Surface Tension,
Those look great, so you opted for some pretty thick plywood there. It must give it a substantial feeling and less resonance on the baffle. Are those Vifa's being driven by the tube amp in the picture? What depth are you using on the channels?
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Old 11th February 2013, 04:42 PM   #1289
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Default Where in that huge thread....

Quote:
Originally Posted by xrk971 View Post
Details of Flatter is Better BIB build in the Terry Cain BIB thread. I thought since it is a foam core build, better to post final pix and sound clip here though.

They sound great and have the ability to fill the room with some nice bass. I like how they ended up looking too. I just need to decorate them now.
Where in that huge thread did you find the plans for this little beast? Looks interesting.

I dug around a little but that thread is almost as long as this one is.
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Old 11th February 2013, 05:10 PM   #1290
xrk971 is offline xrk971  United States
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Recurve,
I was initially inspired by Jhutka's TC9FD BIB Click the image to open in full size.
but wanted to make it flat for a wall mount as I have no floor space.

I came up with the flattened design based on the volume and length dimensions produced by GM's BIB calculator (which gives same dimensions as Jhutka's design above). I basically preserved cross sectional area by squashing the BIB to 3 in deep. I had to make an inverted V divider to have enough room for driver. Plan as built is below (note typo - 3 in deep not 4 in). I made the V curved as a change from original BIB design to buy more clearance for driver and hoping to make horn expansion exponential instead of conical. Very easy to do with foam.

Click the image to open in full size.
The thread is here: Terry Cain's BIB -why does it work and does anyone have those Fostex Craft Handbooks?

Internals look like this:
Click the image to open in full size.

I have mounted them upstairs (out of the "speaker warehouse") and have been listening to them a lot. They sound very nice - some people would say bass-centric but I like the sound for some types of music. It can actually handle rap and hip hop now - surprising . I recommend it as a fun and nice looking speaker that fits into any room with no floor space.

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