Stereo Integrity 24" subwoofer - not kidding! - Page 7 - AVS Forum
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post #181 of 870 Old 08-15-2013, 01:36 PM
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The dustcap looks like it is 12" in this photo lol

Close. The dust cap is 10.75" diameter. smile.gif
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post #182 of 870 Old 08-15-2013, 01:48 PM
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I was just browsing over there and I will go with two opposing manifolds in my front corners as I know the response will be awesome there. Usually these are connected to wall studs so I don't think anything will stop something from flexing. My Baffle wall will be more robust than any wall anyways. I did not get the correct formula for the manifold opening as I did not see a 24 inch driver listed. I saw 18x12 for an 18 but what two 24's? Also, the only way I could get even close to the 10 times VAS is to have the manifold within my room rather than the area behind the Baffle. Any ideas or should I start a new thread?

Ya like what was stated, 2 opposed drivers don't need to be crazy braced. I'd personally would do 1" ply at least. You will gain dB's as well with the manifold, the flexing of the wall takes more than you'd think off total spl, especially at the lower HZ. As far as the opening, I'm not qualified to answer that but when I build mine with my 4 x 18's, I was told for it to be as tall as the drivers and at least half as wide, so I have 4 and I'm 36" high and 30" wide (thats as big as it could be) and it's great.

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post #183 of 870 Old 08-15-2013, 02:02 PM
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"I was told for it to be as tall as the drivers and at least half as wide..."

that sounds about right. if the baffle hole starts to get really small, a large peak can form in the higher frequencies and even though it is typically out of band, its effects can still creep in.

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post #184 of 870 Old 08-15-2013, 02:05 PM
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You'd better beef the crap out of the baffle wall. I first has my 18's in my IB in a baffle (now in a manifol( 1.5" ply, quad 4x4's per side with 4 on top and 4 on bottom and it still shook the wall so bad I had to change it a manifold (was perfect after that) lol. Other than pouring concrete, it was as braced as it could possibly be. It shook and flexed so badly it it was pulling the hard wood floor planks right above it out of their locking positions lol.
I reinforced my IB baffle with welded steel trusses. The structure doesn't flex at all.
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post #185 of 870 Old 08-15-2013, 02:10 PM
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four responses of an 18" driver in a baffle hole cutout.

first is no hole. just mounted on the wall flush.
next is hole that is 25cm deep and area equal to the cone.
next is hole that is 25cm deep and area equal to half the cone.
last is hole that is 50cm deep and area equal to half the cone.

so, the smaller the hole, the higher the peak, the deeper the hole, the lower in frequency where it occurs.






hornresp overshoots the resonant peaks, but it provides some sense for what is going on.
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post #186 of 870 Old 08-15-2013, 02:18 PM
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Quote:
Originally Posted by LTD02 View Post

four responses of an 18" driver in a baffle hole cutout.

first is no hole. just mounted on the wall flush.
next is hole that is 25cm deep and area equal to the cone.
next is hole that is 25cm deep and area equal to half the cone.
last is hole that is 50cm deep and area equal to half the cone.

so, the smaller the hole, the higher the peak, the deeper the hole, the lower in frequency where it occurs.

hornresp overshoots the resonant peaks, but it provides some sense for what is going on.

Those sims seem to be missing the 2-9Hz response MK is always looking for.

tongue.gif
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post #187 of 870 Old 08-15-2013, 02:29 PM
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Yeah, that peak happens at 170hz! My speakers pound at that frequency, no need for subs there.

My biggest question is I only have 300 cubic feet behind the wall I will build and IB's require 840 cubic feet. My room is 2100 cubic feet so should I have a reverses manifold or don't worry about the small 4 x VAS?
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post #188 of 870 Old 08-15-2013, 04:07 PM
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Do IB drivers have stiffer suspension / spiders making it less efficient as it does not have the "spring" a sealed enclosure provides
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post #189 of 870 Old 08-15-2013, 04:29 PM
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Do IB drivers have stiffer suspension / spiders making it less efficient as it does not have the "spring" a sealed enclosure provides

No. It's the other way around. IB drivers typically have a very soft compliant suspension and the net effect or advantage of an IB system is that there is no box 'spring' to possibly affect sound quality.

IB is the anti ultra-small, high powered sealed subwoofer system. tongue.gif

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post #190 of 870 Old 08-15-2013, 05:36 PM
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James I'm coming when these are done...yes I'm inviting myself
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post #191 of 870 Old 08-15-2013, 05:54 PM
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You are always welcome! It should be fun but I wonder how much it will be different. The guy that came to get all the subs loved them after two demos! Wait until you hear the new surrounds, your first impression will be Wow, those are surrounds! They are freakin huge! They are stage monitors for concerts! The real size ones. The only thing that won't be impressive with the IB is the picture because you can't see the woofers in a manifold. There will be two huge holes in my baffle wall on the sides of the screen and no more curtain to let them breath!
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post #192 of 870 Old 08-15-2013, 06:10 PM
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You are always welcome! It should be fun but I wonder how much it will be different. The guy that came to get all the subs loved them after two demos! Wait until you hear the new surrounds, your first impression will be Wow, those are surrounds! They are freakin huge! They are stage monitors for concerts! The real size ones. The only thing that won't be impressive with the IB is the picture because you can't see the woofers in a manifold. There will be two huge holes in my baffle wall on the sides of the screen and no more curtain to let them breath!

Haha I'll bet he did. 12 of those would make almost any basshead happy.

I do love those speakers. I would use them myself but I'll only have 24" max behind the screen. Those surrounds are asinine though. eek.gif They're deeper then most tower speakers. They're so over-the-top ya gotta love em.

I'd assume you won't be able to tell the difference if its eq'd the same. I've never heard an IB though so I'm interested myself. I'll be heading up as soon as you're done to watch a 5 star.
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post #193 of 870 Old 08-15-2013, 06:25 PM
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Hopefully there will be new one by then! I am hoping The man of steel is 4.5 or above. I do have a couple of surprises on hand you need to hear. PM me for details! I am setting my theater for an ideal 7.1 for the front seats as I usually don't fill all 7 seats anymore so I will mount the back speakers right over the back seats! The front 4 seats will be ideal! If I could fit 5 across I would not need a back row.
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post #194 of 870 Old 08-15-2013, 06:28 PM
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BTW, I am selling my DCX 2496 as I don't need it anymore with my PEQ in my AVR.
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post #195 of 870 Old 08-15-2013, 06:44 PM
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Yah I'm sure something will be out by then. We can put those 24's to work. That's crazy four of those have more displacement then your 12 13's...

I'll shoot ya a pm so we don't go off topic.
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post #196 of 870 Old 08-15-2013, 07:08 PM
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FYI, I'm dropping off the last remaining spacer at the machine shop tomorrow so they can duplicate it exactly for the production run. Thankfully we didn't use all four prototype spacers that we had built to begin with! The guys in his shop forgot to write down a few key dimensions when they made the prototype spacer/adapters. When I drop off the last of the original spacer/adapters tomorrow they will get moving on a full production run of them for us.

...that means we can start producing the 24's when the adapter/spacers are built. biggrin.gif
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post #197 of 870 Old 08-15-2013, 07:44 PM
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"My biggest question is I only have 300 cubic feet behind the wall I will build and IB's require 840 cubic feet. My room is 2100 cubic feet so should I have a reverses manifold or don't worry about the small 4 x VAS?"

simple answer:

the effect on frequency response will likely be a db or less.

the effect on qts will likely be 10% or less.

so, it will work just fine.

more advanced:

the oddball thing about the 10x vas number is that the driver's vas can be made lower by making the suspension tighter. so with a nice tight suspension, you don't need as much open area behind the driver because the driver itself is already providing lots of "spring". but that tight suspension itself provides excess spring, which kind of defeats the whole point of an infinite baffle.

ideally, there would be no air spring behind the driver...but at the same time any excess suspension spring in the driver itself would be minimized.

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post #198 of 870 Old 08-15-2013, 09:08 PM
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Yeah I modeled a true IB and my 300 cubic foot enclosure and it was off .5 dBs at 10hz and 1 dBs at 5hz. Could actually use more power too. However the sound quality would be affected not being a true IB but I am not sure how much. I could do a dual opposed manifold thing. Just kidding. For an IB these drivers are supposed to have 210 cubic foot per Driver so maybe only use 2 drivers? I mean after modeling these compared to what I had would have 8 more dBs at 10hz. Two would have 2 dBs more at 10hz. Incredible that two would have more spl at 10hz. I did not bother to even check above 30hz but I think I need all 4 to equal te Midbass I had.
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post #199 of 870 Old 08-16-2013, 07:26 AM
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I'm enjoying the conversation, but MK, it would be beneficial to go ahead and start your build thread so these answers to your questions can all be found in one area.

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post #200 of 870 Old 08-16-2013, 07:56 AM
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I was thinking that. Will do.
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post #201 of 870 Old 08-16-2013, 08:47 AM
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Everything is buttoned up on the last "prototype" (this is how they will be built in production) so I took a video of it in action. smile.gif
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post #202 of 870 Old 08-16-2013, 08:58 AM
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Looks great! Will there be other options in time for the surround spacer thing? Or can it be removed and not used? When the HT version is out, I'll try one out but I can't say I'm a fan of that spacer, or at least not a fan of it shiny black anyways but if it could be removed then it's all moot.

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post #203 of 870 Old 08-16-2013, 09:17 AM
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Once the HT version is out 2 will be ordered to replace my Dual Opposed HT 18's or SURE!!!
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post #204 of 870 Old 08-16-2013, 09:21 AM
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We know these things we have displacement but I am hoping they sound good too! You know how those big woofers are big and slow compared to my little 13's which were small and fast. Oh wait, I am talking about the ability to throw them not to play bass. Carry on!
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post #205 of 870 Old 08-16-2013, 09:36 AM
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We'll let you be the beta tester MK LOL I've been the beta tester on a good number of drivers and only once did it end ugly, I'm sure they will be great.

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post #206 of 870 Old 08-16-2013, 09:42 AM
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Watching that video makes me want a pair of 24's now. Will have to wait for the ported/sealed versions. Shipping will be the killer though. Time will only tell.
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post #207 of 870 Old 08-16-2013, 09:56 AM
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Any idea how much this weighs? Think the HT will weigh more with a larger magnet? Where has the facility moved?(Trying to see if its realistic driving range from Richmond, VA to save on shipping
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post #208 of 870 Old 08-16-2013, 10:09 AM
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We must send one of these 24's to Josh Ricci.
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post #209 of 870 Old 08-16-2013, 11:18 AM
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Any idea how much this weighs? Think the HT will weigh more with a larger magnet? Where has the facility moved?(Trying to see if its realistic driving range from Richmond, VA to save on shipping

It weighs 76 pounds by itself and close to 100 pounds packed up for shipping.
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post #210 of 870 Old 08-16-2013, 12:16 PM
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It weighs 76 pounds by itself and close to 100 pounds packed up for shipping.

So where in NC are you located now after the move? will likely Drive to save on shipping

P.S. My Brother loves the Custom 18" SI Mag V3 you built for him biggrin.gif
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