Possibly Infinite Baffle? - AVS Forum | Home Theater Discussions And Reviews
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post #1 of 19 Old 05-30-2019, 10:04 AM - Thread Starter
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Possibly Infinite Baffle?

I'm so indecisive. Vacation starts next week and I'm still brainstorming when I should be ordering.

I have 4 cx1200 right now. I know they aren't ideal for IB, but what if I did (16) of them? It would be 2 separate opposed manifolds in the basement coming up through the floor, with (8) in each opposed manifold. Winisd says it would work with 1000 watts, just tickling xmax at 10hz. I don't know how accurate that is...

I would love to use the IB318 but it's expensive for 4 of them. Are there any cheap alternatives? So after you guys shoot down this stupid idea, I'll go back to just building my original plan.
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post #2 of 19 Old 05-30-2019, 10:21 AM
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IB3 18 may seem somewhat pricey per driver, but it's a huge amount of displacement per driver (and per $). Pretty sure each would be significantly more displacement that. 4 CX1200's. Do the math of displacement per dollar to help guide you.

Not that that's everything. There are advantages to dividing up the work over a lot more coils and keeping excursion down. But disadvantages too (not so much for IB though).
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post #3 of 19 Old 05-30-2019, 11:01 AM
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Quote:
Originally Posted by doodoobutter View Post

I would love to use the IB318 but it's expensive for 4 of them. Are there any cheap alternatives? So after you guys shoot down this stupid idea, I'll go back to just building my original plan.
Fi gives a 10% discount if you order four or more but I think the turn sound time is two weeks or so.I am in the same situation and was looking at alternatives to the IB318 but nothing models as good. The UM18 isn't bad but still not as good as the Fi's.
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post #4 of 19 Old 05-30-2019, 01:15 PM
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The Fi’s are THE best choice for IB. You won’t regret the extra cash.


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post #5 of 19 Old 05-30-2019, 01:22 PM - Thread Starter
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I would love to do 4x IB318 but I have too many projects going on right now to fit it in my budget. 16x jbls are like 1/3 the price.
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post #6 of 19 Old 05-30-2019, 03:12 PM
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So after you guys shoot down this stupid idea, I'll go back to just building my original plan.

What was your original plan?
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post #7 of 19 Old 05-30-2019, 04:29 PM
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Quote:
Originally Posted by doodoobutter View Post
I would love to do 4x IB318 but I have too many projects going on right now to fit it in my budget. 16x jbls are like 1/3 the price.
The JBL probably are a better value depending on the price you get them for. However, 2 of the IB3 18's move more air than 12 of the CX1200's. So it isn't far off.
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post #8 of 19 Old 05-30-2019, 05:02 PM - Thread Starter
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I wait for them to go on sale for $30 a driver. My original plan was 4x cx1200s tuned to 18hz. Winisd says 118dbl at 20hz. It gets in the mid 120s between 30hz and 80hz.

Theyre so cheap I want a truck load of them. IB is the only way I could get a truck load of them in my living room.
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post #9 of 19 Old 05-30-2019, 05:18 PM
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Quote:
Originally Posted by Zarkoff500 View Post
Fi gives a 10% discount if you order four or more but I think the turn sound time is two weeks or so.I am in the same situation and was looking at alternatives to the IB318 but nothing models as good. The UM18 isn't bad but still not as good as the Fi's.
Do you have to call them to get that? I ordered 4 and saw no discount. Mine are still being made and I ordered May 6th. They're behind right now, guy said plan on 5 weeks.
These things have a ton of Xmax for an IB. I imagine it would take several JBLs to match one IB318. Cant wait to get mine.

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post #10 of 19 Old 05-30-2019, 05:25 PM
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Originally Posted by lloyd401 View Post
Do you have to call them to get that? I ordered 4 and saw no discount. Mine are still being made and I ordered May 6th. They're behind right now, guy said plan on 5 weeks.
These things have a ton of Xmax for an IB. I imagine it would take several JBLs to match one IB318. Cant wait to get mine.

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I emailed and asked them. Hopefully they will still apply the discount.
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post #11 of 19 Old 05-30-2019, 05:26 PM
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It takes six. Well, six and a bit more.
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post #12 of 19 Old 05-31-2019, 03:12 AM - Thread Starter
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Are you saying it takes 6 cx1200s to match one IB318? If so, I might be on to something here on the cheap. And possibly with more mid bass too, which will have to be toned down.

Edit 1: Interesting update. I modeled 16x cx1200 drivers vs 4x IB318 in winisd. The 16 cx1200s are around 132dbl from 30zh to 80hz. The 4x IB318 are around 128dbl from 30hz to 80hz. Under 30hz, they are both exactly the same, hitting 123dbl at 20hz, 119dbl at 15hz, and 113dbl at 10hz.

As soon as these cx1200 go on sale again, I'm going to buy like 20 of them. I hope I don't have to wait for black friday

Edit 2: I tried modeling some other 4x 18" subs and nothing comes anywhere close to 4x IB318 or 16x cx1200. I will post a build thread when they go on sale for $30. I will have to learn to take measurements so I can post results.

Last edited by doodoobutter; 05-31-2019 at 05:31 AM.
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post #13 of 19 Old 05-31-2019, 06:14 AM - Thread Starter
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Before you read this, see my last post. According to this link:

https://www.hometheatershack.com/for...affle-faq.html

The area of the hole in the floor should be no less than the total combined sd of the drivers. So 8 cx1200 is 680in^2. That is a massive hole in the floor. Can I get away with like 12x18 inch hole? Or is this whole project now screwed? I don't know if I want to cut 4 holes in my floor...
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post #14 of 19 Old 05-31-2019, 01:31 PM
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Are you sure IB is right for your situation?

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post #15 of 19 Old 05-31-2019, 05:40 PM - Thread Starter
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I think so. I don't mind cutting holes in my floor, and I don't mind spending $360 to get 12 more drivers to do it. I also don't want a lot of enclosures in my living room, we're trying to keep it minimalist. We're coming from a lilmike f20 so we don't want any less than 115db at 20hz. If I can run 8 cx1200 through a 12" x 18" hole in the floor 2x, and it will work like winisd says it will, I want it and can't think of another way to do it without tons of boxes in the room.

And also WAF has already approved of putting holes in the floor instead of massive boxes in the living room. And she loves bass, the f20 behind the couch made her happy lol.
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post #16 of 19 Old 05-31-2019, 06:00 PM
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Smaller than recommended manifold will have some effect on the sound, acting somewhat like a port in a bandpass enclosure. It could probably be modeled in hornresp or something if you really wanted to. Or just build what you can, measure, and eq. It may not be perfect but will still be pretty good. The closer you can get to ideal the better. 12x24 is better than 12x18.

Yes, a host of cheap $30 12" drivers can provide massive displacement. I've thought about it but at some point the drivers themselves take up too much physical space. For example... Putting 16 Fi IB3 18's in an IB alignment is nuts already. But can you imagine trying to find a place to stuff 96 of those CX1200's??
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post #17 of 19 Old 06-01-2019, 12:12 AM
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Quote:
Originally Posted by doodoobutter View Post
I'm so indecisive. Vacation starts next week and I'm still brainstorming when I should be ordering.

I have 4 cx1200 right now. I know they aren't ideal for IB, but what if I did (16) of them? It would be 2 separate opposed manifolds in the basement coming up through the floor, with (8) in each opposed manifold. Winisd says it would work with 1000 watts, just tickling xmax at 10hz. I don't know how accurate that is...

I would love to use the IB318 but it's expensive for 4 of them. Are there any cheap alternatives? So after you guys shoot down this stupid idea, I'll go back to just building my original plan.
Start with 2 Fi 318's. My friend runs 2 and they barely move and they crank out plenty of bass for his room.

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post #18 of 19 Old 06-01-2019, 09:07 AM - Thread Starter
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Quote:
Originally Posted by Bigus View Post
Smaller than recommended manifold will have some effect on the sound, acting somewhat like a port in a bandpass enclosure. It could probably be modeled in hornresp or something if you really wanted to. Or just build what you can, measure, and eq. It may not be perfect but will still be pretty good. The closer you can get to ideal the better. 12x24 is better than 12x18.

Yes, a host of cheap $30 12" drivers can provide massive displacement. I've thought about it but at some point the drivers themselves take up too much physical space. For example... Putting 16 Fi IB3 18's in an IB alignment is nuts already. But can you imagine trying to find a place to stuff 96 of those CX1200's??
If I go with the Fi I would only do 4. I don't think 16 cx1200s will take up that much space in the basement. They will be in a storage area under the living room. I was going to put a driver on each side of the enclosure so it'll extend down from the ceiling just over 2ft.

@markmon1 , if winisd is giving me accurate numbers, I will get more output from the cx1200 over 2x Fi 318s. Pretty much 6db from 10hz to 80hz. I think I'm going to go for the 12s when they go on sale. I'm really curious about what kind of measurements I'm going to get. They're cheap, if I don't like it I'll put them on craigslist and save some for our game room in the basement. Then I can go with 4x Fi 318s since I'll already have holes in the floor and end the upgraditis.
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post #19 of 19 Old 10-14-2019, 12:56 PM
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Cerwin Vega Vega series 15" might work for infinite baffle. Not as good as the FI driver though.

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