Terry Cain's BIB -why does it work and does anyone have those Fostex Craft Handbooks? - Page 174 - diyAudio
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Old 15th November 2006, 04:42 PM   #1731
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I have to admit I fancy trying this. FWIW, the specs are excellent for the load (and the price), and should suit a wide variety of amps, tube, SS, GC, some of the more powerful T-amps, the works. They'd also drop nicely into Terry's original cabinet IMO.
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Old 15th November 2006, 05:23 PM   #1732
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As far as a tweet, I've used Apex Jr 8ohm supertweets crossed over to a CSS WR125STs (16ohm for one of Dave's Bipolar Bipoles) with a 1.8uf Solen cap. Would this same setup work for these Neofone drivers in a BIB as well? I have no idea what the frequency range is of those tweets nor the effect of the cap as I built those speakers in a sort of build by numbers manner.

Piggybacked on this question (I didn't get a reply on an earlier post), I'm wondering about my current WR125ST's. I've seen posts about the possibility of bipole BIB's, but I am wondering about a BIB with two WR125ST's on the front. Actually 2 x WR125ST's and a supertweet in a MTM. See, these drivers are 16ohm so they have to be paralleled. Would I really screw things up putting them one on top another in a BIB?
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Old 15th November 2006, 05:30 PM   #1733
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Thanx GM

dave
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Old 15th November 2006, 06:01 PM   #1734
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Quote:
Originally posted by planet10


Neophones don't have aluminum cones. Feels like a plastic variation to me.
dave
I don't doubt you Dave, as you've got a pair and I don't. They do say on their website and forum that they are "alloy" cones, and Brian has mentioned some sort of special damping coating. Perhaps that makes them feel plastic?

Re: tweeters, if one has cash to burn, their website has a crossover for the Fostex ribbon tweeter that's on sale at PE for $60.

In any case, they seem like they'd have strong dynamic capabilities for one of the smaller BIB cabs. There's a big advantage to that, as my arms are tired after just cutting the panels for the Hemp BIB's. I've got the double thick front baffles glued together now, and all of the holes cut. I'm getting excited to hear them, but not to move them around.

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Old 15th November 2006, 06:24 PM   #1735
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Default Check them out...

Pjanda1 use a small neo magnet to check the cone. Aluminum is still magnetic enough to feel some pull. The term "alloy" is used to discribe plastic composites as well as metal mixtures. Regards Moray James.
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Old 15th November 2006, 07:04 PM   #1736
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Greets!

Yes, you can make MTM BIBs, just put the tweeter at the driver position and double the mouth area of the single driver's alignment.

GM
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Old 15th November 2006, 07:38 PM   #1737
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OK, so the dims for the FR125's (which I assume will work just fine for these WR125's) show a line length of 120", driver at 23.5" down and a Sm value of 55"^2. If I were going to build these MTM, I would put the tweet at the 23.5" down position with the WR's above and below and would increase the Sm to 110"^2, right? Is there a ratio I should try to stick to? I've seen it mentioned but haven't paid attention.

I think I might have to build a pair of these then evaluate whether or not a pair of NeoFone's might be in my future. However, I'm first going to get together with a local guy I found on craigslist to listen to my current speakers with some decent amplification. It may very well be that I'm in love with my current speakers, but because of my amplifier, I just don't know it yet.

Thanks!
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Old 15th November 2006, 09:08 PM   #1738
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Quote:
Originally posted by pjanda1
They do say on their website and forum that they are "alloy" cones, and Brian has mentioned some sort of special damping coating. Perhaps that makes them feel plastic?
Could do. I'll try Moray's trick when i get home. I guess i could just ask Brian too...

dave
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Old 15th November 2006, 11:39 PM   #1739
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Quote:
Originally posted by mrpopgun
OK, so the dims for the FR125's (which I assume will work just fine for these WR125's) show a line length of 120", driver at 23.5" down and a Sm value of 55"^2. If I were going to build these MTM, I would put the tweet at the 23.5" down position with the WR's above and below and would increase the Sm to 110"^2, right? Is there a ratio I should try to stick to? I've seen it mentioned but haven't paid attention.

Thanks!
Greets!

You're welcome!

Correct.

Yes, me and others have made some suggestions and I posted a little Excel calculator, but I didn't save the post numbers. Anyway, I recommend ~8.812" W x 12.50" D. You can also use TC's cab height/driver location with the same W x D.

GM
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Old 15th November 2006, 11:47 PM   #1740
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Oh wait, there is no way I can do an MTM with these drivers - these CSS drivers are deep and the upper driver would collide with the baffle I'm sure. I don't think I could rebate enough without punching through the baffle.

What would putting both drivers below the tweeter do to the sound? I would think they would fit alright that way.
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