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Question about DHD NTX-6812 Car Subwoofer

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Dhd ntx-6812 I got this sub from a friend a few yrs back and let set since.Now I finally want to install but can't get the box recommendations anywhere online.Having botched this befor on other installs I wanted the best box size for it.Can you help?Also,should it be a ported box or closed?Should I mount magnet in box or out? much appriciated. kenny

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Anonymous

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I have 2 of them in a sealed bassworx encloser abou 1.5 cubic feet each side and they hit hard as hell on a 2000 watt powercoustik

Posted on Nov 24, 2008

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HI Kenny,

If you want to know the procedure for building a great Sub box. go to this aritcle.

http://www.termpro.com/articles/buildbox.html

Posted on Nov 25, 2007

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I need to know what air space is needed for a subwoofer box for 2 8" dhd power cruiser NTX-6408 subs so I can build a box for them

it is not necessary you fix it in a big box it work best.....in small box it give small voice...
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2 NTX-6812's. need box and amp.

if your subs are dvc 1000w max and 500rms wiring up to a 1 ohm load you would need a 1000w max 1 ohm stable amp. to put this in a pickup truck, i would not put them in a box, i would get 2 12inch tubes to put them in. cause a wedge truck box would make your system sound like garbage and will be distorted, your sql will be poor, basically you would need the right amount of air space for the subs.
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For this sub the enclosure is pretty basic.

Sealed box- 2 ft cubed with a shared chamber would be fine. Can go smaller is you need the extra space. THe minimum requirment is .7 per sub.

Ported box- 3 ft cubed, with the port tuned to about 45 hz will work.. 45 hz isn't very low bass, but is at the very bottomn end of the frequency response for this driver.Also, if you are gonna run a ported enclosure, be ware of power handeling issus, and be careful not to over drive the woofer..800 watts rms for the pair on the high side.
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2 DHD NTX-6812 car subwoofers

First you'll need to buy a good quality amp wiring kit. For the torture your battery receives, get a power cap. The higher the farad the better off. And as for sound quality use really good RCA's and speaker wire. Try to keep the amp as close to subs as possible, and speaker wire a the necessary length. Not to long. Be sure to have a good ground.
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How do you have it wired now?

Impedance of each voice coil?

Number of voice coils per speaker?
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With two 4 ohm svc subs and a 4ch amp the best way to hook it up is as you have described. There is no way of wiring it to get a lower ohm with your set up.
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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.
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Voice coil has been blown open. Most likely alot of times what I do to test a speaker is connect it to a 9 volt battery. on and off and the speaker should bounce. If not speaker is blown. Plus this way you could save yourself lots of problems. If the speaker was shorted and not blown open. You would now possible have a blown amp and home stereo.
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