IB Build - 2x Fi IB3 18" vs. 4x AE IB15 15" - AVS Forum
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post #1 of 22 Old 01-02-2010, 05:20 PM - Thread Starter
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Ok all...

In order to keep up with the new QSC build that I completed back in October 2009, I'm looking at infinite baffle for a subwoofer setup. Of the 2 options, which would you choose? Both shipped are around $500 ~ $550.

If there are other drivers for around the same price, feel free to let me know.

Here are the choices:

(Qty x2) Fi Car Audio IB3 18" driver

Details:
Fs: 22.3 Hz | 22.5 Hz
Re: 1.5 Ohms/coil | 2.8 Ohms/coil
Qms: 3.33 | 3.41
Qes: ..81 | .77
Qts: .65 | .62
Mms: 272g | 270g
Sd: 1210cm^2 | 1210cm^2
Vas: 381 l | 381 l
Spl: 89.1dB 1W/1m | 89.4dB 1W/1m
Bl: 8.43 N/A | 11.8 N/A
Xmax: 30mm
Rms: 550W @ 20Hz
Sealed box: Infinite Baffle Only
Ported box: N/A
Sub OD: 18.500
Cut ID: 16.750
Mounting depth: 9.500
Displacement: 0.22cuft

OR

(Qty x4) AE IB15 15" driver

Details:
Fs (Hz) 16
Qms 6.8
VAS (ltrs) 439
Mms (g) 220
Cms (mm/N) .45
Sd (cm²) 830
Xmax (mm) 18.5

Theater Room Details:
Approx: 13'W x 24'D x 8'H

IB cavity where the subs will vent into will be approx 310 cu. ft.

The subs will be located behind my screen wall.

Here is the link to my speakers:
http://www.avsforum.com/avs-vb/showt...+sc+2150+clone
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post #2 of 22 Old 01-02-2010, 08:56 PM - Thread Starter
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Anybody want to take a stab at it???

Anyone... Bueller... Bueller... Bueller... LOL

I know that there are plenty here that have an IB setup or at least have the knowledge.
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post #3 of 22 Old 01-02-2010, 09:27 PM
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I would go with the four AE IB15 subs.

They will have a little more output down below compared to the Fi drivers without EQ. With EQ the Fi will have around a 1.5dB advantage below ~25Hz. I believe I would give the nod in SQ to the AE four pack though.
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post #4 of 22 Old 01-02-2010, 09:58 PM
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Did you model this yet? Your box size is the volume of your rearwave area (remember the 10*vas of all drivers rule). I'm getting ready to hit the sack but if you havent figured it out in the morning I'll give it a spin.

Quote:
Originally Posted by vasyachkin
Even i, the genius, only vaguely understand what i am saying here.
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post #5 of 22 Old 01-03-2010, 02:47 AM
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You may want to try this site.

http://ibsubwoofers.proboards.com/index.cgi

T6

Clearwave 4TSE and 4CC build thread
http://www.avsforum.com/avs-vb/showt...1#post19489740
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post #6 of 22 Old 01-03-2010, 05:27 AM
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Chuck - I recommend either 4 AE15's or 4 Fi 18's.

The folks over at the IB sub cult (link above) stopped me from making some mistakes when building our IBs. Be prepare to have a room design, room layout, etc.

Be prepared for a "plan-B" when building an IB. The sound is awesome, but they move and shake the entire house.
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post #7 of 22 Old 01-03-2010, 06:53 AM
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I would do the Fi IB318's for a couple of reasons.

1. They will displace more than the four AE 15's.
2. They will require less rear wave space (10x Vas).
3. They can be rebuilt if something were to ever happen to them. I don't think the AE drivers can.

I currently have four in two manifolds (two per manifold) above my mains.

Analog: Pioneer SX-950, CT-F9191, AD797MCPS, PL-707, RH-65, RG-1, SR-202, Monitor 10/HE-500 hp's
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post #8 of 22 Old 01-03-2010, 09:20 AM
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Chuck - agree with Weverb. I drive four of the Fi 18" with one EP2500 (about 1/4 to 1/3 gain). Don't know if it still fits in the budget, but picking up a used EP2500 may leave enough $$ go with four Fi 18's...

Just an idea... it is so easy to spend other peoples money
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post #9 of 22 Old 01-03-2010, 03:36 PM
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I wouldn't get too hung up on 10x Vas. Model 5x Vas next to 10x Vas and the difference is not huge. Certainly bigger is better but falling a little short of 10x isn't a deal breaker IMO.

I'm quite happy with 4 IB15s (in two separate manifolds in different ceiling positions) + a Maelstrom. Even with the maelstrom off the low end is great with just the IB manifolds playing. The maelstrom adds some good punch up a bit higher and helps me achieve the goals of a multi-sub setup as described in some other threads both here and on diyaudio.
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post #10 of 22 Old 01-05-2010, 05:26 PM - Thread Starter
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Well guys... I went with the x2 Fi Car IB3 18" woofers to start. A forum member made me an offer that I just could not refuse!!!

The baffle will be cut to accomodate 4 IB3 18's but 2 holes will be capped until I get approval from my financial advisor (Read: WIFE) says ok for the other 2.

BTW... she has NO IDEA about the IB setup!!
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post #11 of 22 Old 01-06-2010, 05:23 AM
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Quote:
Originally Posted by chucky08016 View Post

Well guys... I went with the x2 Fi Car IB3 18" woofers to start. A forum member made me an offer that I just could not refuse!!!

The baffle will be cut to accomodate 4 IB3 18's but 2 holes will be capped until I get approval from my financial advisor (Read: WIFE) says ok for the other 2.

BTW... she has NO IDEA about the IB setup!!

Good choice. You are going to be very happy with your new project. Be sure to measure a lot of potential spots before cutting the hole for the manifold.

Analog: Pioneer SX-950, CT-F9191, AD797MCPS, PL-707, RH-65, RG-1, SR-202, Monitor 10/HE-500 hp's
Digital: Laptop, M2tech Young, Oppo 83, Simaudio i5.3, Dali Mentor
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post #12 of 22 Old 01-06-2010, 05:52 AM - Thread Starter
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Quote:
Originally Posted by weverb View Post

Good choice. You are going to be very happy with your new project. Be sure to measure a lot of potential spots before cutting the hole for the manifold.

Well... that may be a issue. The only place that I have to play with is behind the screen wall where the front 3 mains are hidden. When I can, I'll post some pics of what I'm talking about to see what you guys think.
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post #13 of 22 Old 01-07-2010, 06:08 AM
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Chuck-
Heres a picture of the IB before I "dismantled" it.
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post #14 of 22 Old 01-07-2010, 11:25 AM - Thread Starter
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Wrager,

That is very similar to what I'm going to do except mine will be above the center. Kinda like an "innie" IB install but with the drivers facing the room and with.

Seeing this... Now I'm getting REALLY excited!!!

Btw... Your setup from that view is awesome!!!
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post #15 of 22 Old 01-07-2010, 12:42 PM
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Thanks Chuck! I shipped your speakers today and e-mailed the tracking number. I insured them just in case. But I used Fedex...won't ever chance UPS again.
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post #16 of 22 Old 01-07-2010, 02:53 PM - Thread Starter
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Quote:
Originally Posted by Wrager View Post

Thanks Chuck! I shipped your speakers today and e-mailed the tracking number. I insured them just in case. But I used Fedex...won't ever chance UPS again.

Thanks... just saw the email.

And YES... never will do UPS ever either!!
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post #17 of 22 Old 01-07-2010, 08:56 PM
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Quote:
Originally Posted by chucky08016 View Post

Thanks... just saw the email.

And YES... never will do UPS ever either!!

Ehh, six of one, half a dozen of the other. I've had stuff damaged via fedex and ups. My dad had a gun stock broke in half by one of them. Figure that one out.

YID DIY
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post #18 of 22 Old 01-07-2010, 09:41 PM
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Good choice going with the IB18's chucky. I got some of these drivers as well.

Like Wrager said, its good to measure out a few spots before cutting for your manifold. Even one or two feet can make a big difference.

cheers

Trevor
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post #19 of 22 Old 01-09-2010, 05:05 PM - Thread Starter
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Here's another question...

Has anyone with an IB setup installed the subs behind their screen? If so, did you have a problem with the screen material vibrating or moving?

The reason why I ask is one of the places that I have alot of room for the IB is directly behind the screen. When the subs are installed, they would be directly facing the back of the screen with about 10" between the subs and the screen. If I set it up like this, do you think that I'd get alot of movement from the screen?

I could possibly move the front of the subs back so that there is about 15" between them and the back of the screen.
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post #20 of 22 Old 01-10-2010, 12:01 AM
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Mine is that far away from the screen but off on both sides of the screen and not shooting directly towards it, and Ive never had a problem. But I think you might have a prob with screen moving the way your lookin to set it up.

Trevor
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post #21 of 22 Old 01-10-2010, 06:58 AM - Thread Starter
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Quote:
Originally Posted by titch-- View Post

Mine is that far away from the screen but off on both sides of the screen and not shooting directly towards it, and Ive never had a problem. But I think you might have a prob with screen moving the way your lookin to set it up.

That's what I thought. I guess I'm going to position them as you did... sides of the screen. Thanks!!
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post #22 of 22 Old 01-10-2010, 01:33 PM
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Quote:
Originally Posted by chucky08016 View Post

Here's another question...

Has anyone with an IB setup installed the subs behind their screen? If so, did you have a problem with the screen material vibrating or moving?

The reason why I ask is one of the places that I have alot of room for the IB is directly behind the screen. When the subs are installed, they would be directly facing the back of the screen with about 10" between the subs and the screen. If I set it up like this, do you think that I'd get alot of movement from the screen?

I could possibly move the front of the subs back so that there is about 15" between them and the back of the screen.

I was a concerned about this too, but haven't noticed any screen movement. The center 12 subs are largely covered by a 120" Seymour XD AT screen. The center 6 are about 10" from the screen, the adjacent six are closer but only partially covered. Generally, I think more space is better.


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