Eskimo
Full Member
Bass-head
Posts: 143
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Post by Eskimo on Dec 5, 2008 14:08:20 GMT -7
www.hometheatershack.com/forums/fi-audio/14494-anyone-interested-22-ib3.html#post131030The down & dirty: Vd = 2x 18's, which would be about 14.5L per driver! Fs = ? xmax = ? Cost = ? (But less than 2 18's) They have the basket, the motor, and since this is not something they thought up JUST for the niche' IB crowd, I'd say there's a great possibility of it happening. As long as they can nail the specs and keep the cone from becoming too heavy, I think they'll have a heck of a sub on their hands... Caveat is that I think you'll be wanting to seriously beef everything up more than usual. 1" wood instead of 3/4?" In-wall installations requiring cutting out the studs so the width can be more than 13x24 (unless you make a very tall manifold?) I like the sound of it...
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Post by jagman on Dec 5, 2008 15:10:15 GMT -7
You beat me to it! This driver could work incredibly well if one plans on having his IB attic mounted and the rafters are spaced 24" OC. This of course would only work if the driver is built to withstand being oriented parallel to the ground. My hope is they design it such that it still has the limited cone excursion plots of the IB 18's in an IB enclosure but has a lower Fs. That may not be possible... but hopefully we'll find out soon enough.
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Post by ThomasW on Dec 5, 2008 15:39:21 GMT -7
I was waiting until this was something more than vaporware before discussing it...
Thing is when drivers start getting this big the weight of the cone has the tendency to cause the surround to stretch, even when mounted in a vertical orientation.
Back in the day EV had a 32" woofer, the cone was basically made of styrofoam. Owners were told to rotate the unit every 6 mos to even out the stresses on the suspension.
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Post by chrisbee on Dec 6, 2008 2:26:21 GMT -7
If Fi can make it happen then it won't be a white elephant. I'm thinking poor pistonic stiffness using affordable cone materials. High cone inertia sapping transients and dynamic range. A very low frequency crossover requirement. Cone overshoot making bottoming more likely. Though wind resistance should make quite a good brake if the "kite" should ever get out of shape. I doubt you'll ever see much cone movement from a pair of them even on our favourite scenes.  This doesn't mean I won't want to drool all over the pictures of a 22" driver by Fi. If it works well it will become a legend overnight. It could start a new trend or give even greater impetus to IB building. I would imagine such a driver would have a following in the digital/electronic organ field. How many 22" = one fan sub?  Cult members should be made to take an oath that they won't try and build a vertical line array of 22"s into a 4" x 2" partition wall. Just because you can doesn't mean you should!  |
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Post by jagman on Dec 7, 2008 23:24:55 GMT -7
Thomas' comment makes me worry. Sounds like this has potential but a wait and see attitude would be prudent. If history holds true it sounds like vertical mounting will more than likely be mandatory.
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Post by happyhour on Dec 8, 2008 0:17:00 GMT -7
Cult members should be made to take an oath that they won't try and build a vertical line array of 22"s into a 4" x 2" partition wall. Just because you can doesn't mean you should! Now an array in a tin shed is okay as long as you stack enough concrete on it though, rite? LOL Waiting for Jim to pounce. |
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Eskimo
Full Member
Bass-head
Posts: 143
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Post by Eskimo on Dec 8, 2008 8:59:29 GMT -7
Cult members should be made to take an oath that they won't try and build a vertical line array of 22"s into a 4" x 2" partition wall. Just because you can doesn't mean you should! Now an array in a tin shed is okay as long as you stack enough concrete on it though, rite? LOL Waiting for Jim to pounce. Tsk tsk.. that's like putting Tuna in front of a hungry cat!  Thomas - sorry for jumping the gun, just wanted to get some discussion going. I think with today's materials and whatnot, that it should be possible to make a design that's rigid enough and won't sag or suffer the issues of the large drivers of yesteryear.. Making it affordable? We'll see! I had a thought about a use for these possibly being a "dual IB" - picture if you will... in a standard 4 driver vertical manifold, you'd want some sort of brace between the 4 drivers.. well, go one step further and split that manifold completely in 2, making a solid divider. top gets 2 15's or 18's, and the bottom half gets the monster 22's. This would require 2 amps (or 1 big amp driven in stereo with excellent channel separation), and a sub-crossover (with a mild 12-18dB/oct slope), to split the ~80hz LFE signal into a (for example): 30-80hz signal for the 15's/18's 0-30hz signal for the 22's This lets the big woofers do what they do best...couple with stupid amounts of air, and would free up the "smaller" drivers for the more audible ranges. I dunno - probably a bad idea, but just seemed like a neat thought.. Feel free to tear it apart and stomp it flat.  |
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Post by chrisbee on Dec 8, 2008 10:23:17 GMT -7
I like your thinking.  In astronomy circles they call this sickness "aperture fever". We need a name for excessive driver accumulation disease.  Chronic manifolditus?  Vas-cular fever?  Displacement disease? Total Vas? As in: "He's a total Vas!"  Driver fever? Vas-itus?  I've run out of ideas and smilies. |
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Post by mtbdudex on Jan 7, 2009 12:56:19 GMT -7
Cult members should be made to take an oath that they won't try and build a vertical line array of 22"s into a 4" x 2" partition wall. Just because you can doesn't mean you should! You mean for version 2.0 of "Usul" I can't cut more concrete out? I had so much FUN the 1st time.   |
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Post by ficaraudio on Jan 12, 2009 17:41:49 GMT -7
Not quite vaporware   Sample of the 22" basket at least. 2 small changes to the tooling and hoping to get another sample of it before CNY. Surround and gasket are well underway too. Cone is the only somewhat up in the air issue right now. We have vacuum bagged a couple of cones and are happy with the results, but with as many requests as we have received about IB22s, it looks like tooling a paper cone will be the best $$$/performance ratio for that driver. We would like to keep the cost relative to the IB3 series. We have also had quite a bit of interest in a HT line as well. Which I am looking into. Thanks, Scott |
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Post by jimcant on Jan 12, 2009 18:48:19 GMT -7
happyhour You probably think I have shown admirable restraint in not pouncing, don't you Truth is, I had not been following this thread and only found it today I guess it would not be such a good idea to bolt these monsters directly to my walls then ;D, but... |
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Post by ThomasW on Jan 12, 2009 19:00:44 GMT -7
Not quite vaporware We have also had quite a bit of interest in a HT line as well. Which I am looking into. Thanks, Scott Cool ..... I'm old enough to be a cynic until I see proof, then I become a fanboy.. ;D |
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Post by titch on Jan 13, 2009 12:06:21 GMT -7
From just installing 4 of your IB 18's, I can only imagine how big those things are going to be. |
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Post by ficaraudio on Jan 14, 2009 15:02:23 GMT -7
Thomas W... Couldn't agree more. So much vaporware floats around the net and forums. Ive never been one to hype products before they are available. Id rather pop them out as a surprise than have months of waiting for something. But... in this case another project for Ascendant Audio was leaked about a 22" basket and so I decided to release this info since we have been working on it longer than the other basket for AA. I simply didn't want the IB crowd to feel left out as it does seem like a natural fit for the application.
When I get a reworked sample in I will be sure to make a couple of IB versions. It looks like I will have to step back up to the Q motor for an IB22, but its still a little up in the air due to the cone bodies.
Ill definitely keep people posted when I have actual measured data vs just FEA right now.
titch... so how are things working out for you? Any pictures?
Thanks,
Scott
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Post by jimlowe on Jan 24, 2009 14:36:03 GMT -7
This is very interesting news. I was having trouble coming up with a design that would work for 4 FI 18's in my attic, but 2 22"s would work well. I would arrange the drivers along the studs in the manifold, as I'm 16 OC and i'm not cutting into the structure. Might be a slim manifold, but I'm willing to consider it seriously.
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Post by dynamowhum on Apr 6, 2009 15:39:13 GMT -7
hey any update on these. I've got a June birthday coming up. |
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Post by dynamowhum on May 16, 2009 22:57:50 GMT -7
The latest update I have found from the company is once again at the shack where FI announced that it is making more parts on site as they were not satified with their vendors in this area. I guess with the tooling up there is more of a delay but product quality should go up. I willing to wait for that
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