Question about DHD NTX-6812 Car Subwoofer

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Sub does not fully work

About 2 weeks after I bought 2 of these subs I noticed a kind of acidy smell coming from my trunk (I thought it was the box since that was new). Anyways after another week or so I was driving down the road and and lost bass, so of course not being new to sound systems, I checked the fuses on my amp then the fuse leading to the battery, which had blown, no surprise since I am running 2 DHD subs and a 2000 watt legacy amp at 1 ohm. So the problem now is that when I turn the subs on even at a low level it causes my amp to draw insane amounts of amperage, about the same as it would cranked when everything was working. The odd thing is that one sub appears to work fine but the other hardly moves with the same amount of power. If I try to turn the subs past any low level it causes my amp to go into overload protection. Any Ideas would be greatly apprecaited! Also does DHD Power Cruiser have a website?

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Re: Sub does not fully work

My guess is that one of your subs has a damaged voice coil, which acts like a short circuit to the speaker outputs. If you put an ohmmeter on the speaker terminals you should measure a resistance of not much less than 2 ohms (assuming you've wired the VC's in parallel). If you measure a significantly lower resistance then you have a damaged subwoofer.

Posted on Mar 13, 2007

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you cooked the coil in the sub when you see smoke you have clipped the sub. improper wiring probably the issue ohms must match gain must be set properly . if you had gain all the way up thats what did it.

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My kicker sub seems to rattle alot inside the box is it blown?

Most subs when they "blow" usually seperate from the spider, which gives you a rattling noise. if you have a port in the box, it could be possible that the inside tube has come out. the easiest way to tell is to pull the sub out of the box and see if anything is loose inside there. if there isnt anything then smell the sub where the spider is. if it smells like burnt plastic/metal then yes it is blown.
I hope this has helped you and please dont forget to rate my solution for you.

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Hello markwasicki,

You did not specify what type of enclosure the subs are in or if they share the same airspace. But the sound you describe sounds suspiciously like the enclosure is at fault and not the sub itself.

Remove and reverse the subs in the box and test for the noise again. If the noise is still produced on the same side of the box, it's the enclosure. If the noise follows the sub, then you have a problem with that sub.

If the box is making the noise, and it's a ported box, you probably have "port noise". If it's a sealed enclosure, you could have either an air leak or flexing noise. In either case, repair the enclosure or put the subs in a new one. If the sub itself is making the noise, there probably isn't much you can do. Most likely some part of the voice coil assembly is touching where it should not.

Hope this helps.

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1 Answer

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Start here:

Go to the "How to Make a Sub Box Mold Thread" and look over some of the photos.

Building a trunk box for a single sub is a great first project and depending on the time and attention to detail that you put into it, the results can be really fantastic.

Also take a look at the "Tools of the trade" thread. There's tons of good information and ideas on the fiberglass forum, including sources for materials step-by-step photo logs of various projects.

Hope this helps and that you enjoy your new DIY sub enclosure.

Good Luck!

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1 Answer

Kicker sub wont work

Im guessing that it is possibly blown... either you ran too much power to it, or it was hooked up wrong... you should unscrew the sub from the box and look inside to make sure that it is connected correctly.... positive to positive, negative to negative,,, if they so much as touched then the L7 could very well be blown.... smell the magnet and if you smell a burnt smell... it is blown... maybe turn your amp down a little... its possible that it is also in protect mode because you are running too many watts to the amp. Feel free to ask if you have any other questions.... Please rate! :D And good luck... i really hope its not burnt out. that stuff is not cheap.

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1 Answer

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The Solobaric L5 is 450Watts RMS and 900 Peak.
Check your documentation, and no warranty except Massive Audio covers Burned Voicecoils as it is deemed customer abuse.
If it is a typo, and not an L5, your combination (as long as each is level matched) should be ok to run on that sub. When wiring it as you describe, the two amplifiers need to be identically matched in order for both coils to play at the same level.
Seek professional installations so your warranty is intact.

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Did you check to make sure that you didn't blow a channel in the amp? Another thing to check would be the connection on the inside of your box, maybe there is just a wire loose.

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