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Discussion Starter #1
So I have an IB set up in my car, running an idmax off a dc1100.1. My dc1100.1 will go into protect if pushed semi hard. I have the gain extremely low and hp at 30 24db slope. lowpass at 65.
It is not an issue with the amp, voltage is good. The sub is not bottoming out, nor am I exceeding it thermal abilities.
Im really at a loss for what the issue is, could a bad seal thats not isolating the front and back waves be the issue?

Also Im wanting more output, since i have the power i was thinking of doing another 12"max, opinions? 12s are the biggest i can fit BTW
 

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ib setups most of the time will not have the same output as putting a sub in an box. they tend to to have lower power handling also. they need to be sealed really well a lot of times there are holes that u dont see until u start looking hard.
 

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Discussion Starter #4
Forgot to mention that, sub is fine, even durring these times there is no bottoming out or burning coil smell.

I away of loss of power handling and like said the gain is extremely low.
 

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I'd guess the amp is faulty or the sub is messed up, providing you are running a load the amp is rated for. The deal with IB is you need a solid baffle that does not move. Then you need to seal it, but away from the sub if you have some tiny holes I've never been able to tell a difference and I've done a lot of IB. Far as power it is all about xmax, when you hit xmax you are done and you have to eyeball the sub in use to know or you don't know your max. The lower you play it the more xmax you will use. Beating the sub at xmax will trash it eventually, but near always that will be before you overheat the VC so they usually hold up long as they don't rub/bottom/etc. I suppose there could be a sub that gets power compression but I've never heard of it IB, most always you xmax before you can get that much power into it. Make sure your filters are not doing it, that is close if they are off some they could quiet it down. If you have the same voltage out of the amp it has to be the sub, but a moving baffle or leakage should not change in use.

Check your wiring/terminals too that could quiet it, and check the amp wiring that can make it protect for no other reason. You can just look at the voltage at the amp in use, unless it is an intermittent thing.
 

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What's the impedance? Don't pull a bikinipunk and be sure that they are in phase too........ that was damn funny.
 

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Do you have a D2 vc sub? If yes, try to check your wiring... DC Refs are only stable to 2ohm

Hope that helps,
Kelvin

PS: everybody can mess the wiring up... Try to check, you never know
 

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Discussion Starter #10
Sorry for the confusion, i am running one 12" idmax. I was thinking about 2 for more output.

However its a dual 4 wired to 2 ohms. Its not the amp because with the sub installed in a ported box it is fine even with the gain properly set.
 

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If you want to get low with IB, more cone area is better. If the amp is protecting, either it sees too low of a load (ohms) or sees DC on the outputs (output/other internal failure) or sees too much voltage drop at the 12v supply. Those are the most common causes. You can measure the DC from the amp at idle with no sub, and can measure the 12v at the amp under load, and same for ohms of sub unless it is shorting at excursion and not at rest. Any wiring fault in 12v/ground/or speakers can also cause protection even a speaker/power terminal that is not tight. You have to check and verify all that stuff and 90% of the time you will find your problem.
 

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Discussion Starter #13
Voltage remains in the 14s even when amp is in protect, 12v on the remote and def not a ground issue.
Im guessing its over excursion of the woofer, but not sure.
 

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In protect the amp should shut off the power supply and use no power, unless the PS is shorted then it will blow the fuses. If the sub is bad, it should be bad in a box or IB....unless it is shorting at big excursion it does not see in the box or something like that. I don't use big xmax subs IB so not knowing how they fail there. My failures were from pounding them apart, usually the spider or foam blew maybe tinsel lead, and they were cheap subs the better ones I don't have to beat so hard and not had a problem.
 

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Discussion Starter #17
Low z is in Low

Im almost positive that it is due to over excursion at lower frequencys, i have noticed it only does it at louder volumes on either rap or bassy tracks.

Is the HP the culprit. I figured at 30 on a 24 db slope it would be fine.

In the ported box I have it in amp runs flawless, and its made me miss the output but i miss the perfectly smooth blending of the IB. Im thinking another max for the cone area is what i need.
 

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No, the HP is not the culprit.

Look, the only thing that would put that sub into protect would be low speaker impedance. Try seriesing the VCs and changing the Z switch to High and see if the problem goes away (YES, I know... but try it).
 

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Discussion Starter #19
No, the HP is not the culprit.

Look, the only thing that would put that sub into protect would be low speaker impedance. Try seriesing the VCs and changing the Z switch to High and see if the problem goes away (YES, I know... but try it).
Ill try that and see what happens
 

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If you are overdriving it at 30 HP you really need another sub, maybe three more. I always figure double, that is why I have four 12s IB. It is enough so I plan on pair of 15s next it comes out close. I would think VP Electricity is right, try that. VC is a VC no matter how it moves, I could only guess it is shorting at xmax but I'm not a pro with blown subs. Mine only get 100rms each so I can clip them all day if I could stand it and they still will not xmax.....but I can't hear the rest of the music way before the sub amp clips.
 
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