3 IDMax 12s in a 2012 Mustang Infinite baffle install - Realm of Excursion



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Old 02-21-2013   #1 (permalink)
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Default 3 IDMax 12s in a 2012 Mustang Infinite baffle install

I've got one in a 2.4 cube box ported @ 29 hz and I love how it sounds. It's powered by an American Bass VFL 75.1. It's a D2 wired to 1 ohm.

I want to get my trunk back so I'm considering an IB install. I don't have back seats so that's where my amps are going. I'm pretty sure I can fit 3 12s in a baffle behind the rear seats.

I want it to be as loud, but go lower. I'm not concerned with hitting 130+ DBs. I just want a flat response 20-60 Hz that's at least as loud as the one in a ported box.

The reason I chose 3 is because I can Wire them to 1.33 Ohms, so that should feed each around 200 watts correct? Since they're going to be IB that seems like a safe amount of Power to run them provided my subsonic is close to the Fs of the IDMax12. Is this right?

If anyone can recommend drivers that aren't as expensive that will perform similarly I'm all ears. I'm a bit of a basshead, but I don't need ear bleeding loud. I'd rather have the SQ.


Any other help would be appreciated.

Thanks
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Old 02-22-2013   #2 (permalink)
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Default Re: 3 IDMax 12s in a 2012 Mustang Infinite baffle install

infinite baffle should get you to where you want to go. with the added cone area you should be nearly as loud or slightly louder, but will a much flatter response and deeper extension.

3 12s should be able to fit, you only need 37-38 inches of width to mount them in a worst case scenario. Even less if you stagger them slightly. You will have to make sure that the entire trunk is sealed and air tight, and that the baffle is completely air tight. Leaks along the trunk hatch or rear deck will cause problems, it needs to be sealed to prevent the rear waves from coming into the cabin and causing destructive interference.

The idmax is a very good sub, and designed to work well in IB applications. It is a little overkill on 200 watts, and is pricey. FI makes the IB3 sub, which is significantly cheaper, and designed exclusively for IB installs. At 200 a piece, you could sell the idmax you have now, and be halfway towards the cost of a trio of these.

IB312 - Fi Car audio Store

the subsonic is something you will have to play with once they are installed and running on power. Basically, you use the subsonic to prevent the sub from exceeding xmax. I would start off with it around 20 and see how the drivers are handling it. If there is any bottoming out or mechanical noise, proceed to increase the subsonic until it is under control. Or, you could always model it to see how it would behave. If i remember later Ill play around and see if any of my programs do IB modeling
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Old 02-22-2013   #3 (permalink)
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Default Re: 3 IDMax 12s in a 2012 Mustang Infinite baffle install

Wont leaks in the trunk be fine as long as they dont leak into the cabin? Somewhere on caco I was reading an ib thread and guys where having worse results completly sealed up. Do you need 10x vas for ib? If so a trunk wouldnt be big enough so leaks would actually help. In that thread I saw that he would open the trunk and it would play almost the same. Hell even nick from si when he did an oa ib in a friends car he only made the baffle 75% sealed up and it still played great.
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Old 02-22-2013   #4 (permalink)
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Default Re: 3 IDMax 12s in a 2012 Mustang Infinite baffle install

it might help, but ive been under the impression that it is the other way around. i believe jud holds the same idea but i could be wrong. ill reference the cook book when i get in class later and see if i cant figure out which is better. ib is something i have never really dug that far into since it isnt practical in my car. the 10x rule is a general guideline we use in engineering. at that point, volume is much larger than vas and can be assumed infinite baffle. this is of course, an over simplification based on the fact that the change beyond 10x or so is negligible to the overall response. infinite baffle could also be treated simply as an overly large sealed enclosure, if you make some assumptions and go that route.
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Old 02-22-2013   #5 (permalink)
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Default Re: 3 IDMax 12s in a 2012 Mustang Infinite baffle install

Thanks

I've modeled the FI IBs and some AE IB subs in Winisd(trunk is approx 16.5 cubic feet if anyone wants to run some tests for me ) and they didn't match the output of the Maxs. I don't know if that's just a case of the software or what. The only concern I've got is accidentally bottoming them out. I read somewhere the FI and AB IB subs have some sort of stop or stiffer suspension or something to help with that. I even threw around the idea of trying to squeeze a pair of 15s in, but it would've been too much work and my whole stealth install idea would've been blown. The way it sits now it will look more or less like a rear seat delete.

I just upgraded to winisd pro so I'll probably try modeling again to see if anything has changed.
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Old 02-23-2013   #6 (permalink)
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Default Re: 3 IDMax 12s in a 2012 Mustang Infinite baffle install

im not certain how accurate the software models actual output. on the power you have available, the idmaxes are way more than you "need". they are one of the best subs out there for application, but 400 a piece isnt cheap. higher power handling subs are generally slightly louder than lower power handling subs, so you have to weigh the cost of a db or two. You could sell your idmax and have close to half the cost of the fis or even more than half if you went with the ae subs.
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Old 02-25-2013   #7 (permalink)
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Default Re: 3 IDMax 12s in a 2012 Mustang Infinite baffle install

Thanks again.

I'm now seriously considering trying to squeeze a pair of 15s in. I mocked up a basket and I can technically get it to fit. The problem is then building the tunnel around the baffle to the rectangular area/pass-through to the trunk I plan to separate the front/rear wave with.

Last edited by mugman; 02-25-2013 at 06:15 AM.
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Old 11-11-2013   #8 (permalink)
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Default Re: 3 IDMax 12s in a 2012 Mustang Infinite baffle install

I ended up googling my own thread here while searching for people trying to squeeze 15s into a mustang in infinite baffle so I figured I could update it. I went with 3x AE 12 AU subs. I'm seriously impressed. I've had them running for about 4 months now. Nearly flat output to 25 hz where my subsonic is. It's noticeably louder than the IDmax and once I sealed up most of the holes I only had to EQ out maybe 5 db at 40 hz.

Here's a quick blurry pic of when I was installing them.

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Old 11-11-2013   #9 (permalink)
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Default Re: 3 IDMax 12s in a 2012 Mustang Infinite baffle install

Looks good!
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