Subs blown in 1 minute.

[Owners1 0]

So I bought some used DD 9917s off **** and apparently they were just reconed. Well, I had a box built for one of them just to try it out and I started to play it in the car and it wasn't exactly very loud and literally after a minute or so, the sub completely locked up.

It was wired to two ohms @ 3000 watts which is pretty much nothing for a 9917.

So, after that, I hook up the other one. I notice the strong smell of a burning sub after about 20 seconds of playing it loud then about 2 hours later it starts making a sound like a spring vibrating or something. This one isn't blown YET but I sense it's damaged. When I push down on it, I can feel it rubbing. Any of you guys have experience with something like this happening before?

Heres some pictures of it that I took.

Edited March 18, 2009 by SSaudio

[jonbearsmt 919]

perhaps a sloppy re cone job/

[Adrian_D 520]

perhaps a sloppy re cone job/

Or maybe a sloppy install ?

Give us more details on how you installed them, what kind of box, subsonic points...

[justin smith 0]

perhaps a sloppy re cone job/

thats what i think

[Owners1 0]

that is a picture of the design. it's built to exact spec

[Adrian_D 520]

http://img.photobucket.com/albums/v248/Owners1/box-1.png

that is a picture of the design. it's built to exact spec

Do we have to guess volumes and tuning ? Maybe somebody had some experience with 9917's and can figure out if the volume is ok for the power you have...but without some more info nobody can figure out exactly what happened.

I remember reading about someone mechanically damaging an AQ HDC315 in one of Pete's designs. Too much volume for the power he had.

You could take some pics of the subs after the damage, maybe that could give some clues.

[jonbearsmt 919]

http://img.photobucket.com/albums/v248/Owners1/box-1.png

that is a picture of the design. it's built to exact spec

thats just a pic..... it has no numbers.... its just a pic. that helps none.

[Owners1 0]

I am not sure of the tuning.. the box is 11.42 cubes though.

The pics that I posted are of the damaged sub. I sent the severely blown one to DD already but the one I didn't send yet doesn't appear to have anything wrong with it but it sounds good for maybe 5 or 6 seconds then it makes a real strange noise and I have to wait about 10 seconds and it does it again

[Owners1 0]

http://img.photobucket.com/albums/v248/Own...easurements.png

http://img.photobucket.com/albums/v248/Owners1/design.png

theres 2 more pics

[ABXX49 20]

On the second sub it kinda sounds like the coil is rubbing. Maybe it was a sloppy recone job? Give us all the info you got!

[AlpineAndy 3]

http://img.photobucket.com/albums/v248/Owners1/box-1.png

that is a picture of the design. it's built to exact spec

Do we have to guess volumes and tuning ? Maybe somebody had some experience with 9917's and can figure out if the volume is ok for the power you have...but without some more info nobody can figure out exactly what happened.

I remember reading about someone mechanically damaging an AQ HDC315 in one of Pete's designs. Too much volume for the power he had.

You could take some pics of the subs after the damage, maybe that could give some clues.

I remember that HDC3 also

[Adrian_D 520]

I am not sure of the tuning.. the box is 11.42 cubes though.

The pics that I posted are of the damaged sub. I sent the severely blown one to DD already but the one I didn't send yet doesn't appear to have anything wrong with it but it sounds good for maybe 5 or 6 seconds then it makes a real strange noise and I have to wait about 10 seconds and it does it again

Could very well be a bad recone job.

One (expensive) option is to have DD rebuild that sub and try it again. If the install is ok and it holds up, it was definately a bad recone job. If it doesn't hold up...that's the expensive part And you can point fingers at the install.

Did you send DD them some specs of the design ?

[Owners1 0]

On the second sub it kinda sounds like the coil is rubbing. Maybe it was a sloppy recone job? Give us all the info you got!

I don't have much info on it because not much was given to me.

[Owners1 0]

I am not sure of the tuning.. the box is 11.42 cubes though.

The pics that I posted are of the damaged sub. I sent the severely blown one to DD already but the one I didn't send yet doesn't appear to have anything wrong with it but it sounds good for maybe 5 or 6 seconds then it makes a real strange noise and I have to wait about 10 seconds and it does it again

Could very well be a bad recone job.

One (expensive) option is to have DD rebuild that sub and try it again. If the install is ok and it holds up, it was definately a bad recone job. If it doesn't hold up...that's the expensive part And you can point fingers at the install.

Did you send DD them some specs of the design ?

I sent DD one of my speakers to fix it actually. Depending on what was wrong with it, I will decide the next course of action with my second one.. this kinda sucks. I blew my temporary subs too and now im out of bass lol

[bassahaulic 155]

If it rubbing then the re-cone is off. And we can assume the other was the same way.

[ABXX49 20]

If it rubbing then the re-cone is off. And we can assume the other was the same way.

What exactly do you mean by "off"? Off centered?

[bassahaulic 155]

If it rubbing then the re-cone is off. And we can assume the other was the same way.

What exactly do you mean by "off"? Off centered?

Yes causing rubbing. It's not hard to mess up a re-cone.

[Owners1 0]

yeah and the fact that DD claims to not have anyone by his name on record.. kind of makes me suspicious. ill see what DD says though

[Adrian_D 520]

yeah and the fact that DD claims to not have anyone by his name on record.. kind of makes me suspicious. ill see what DD says though

After they tear it apart they should get a better clue of what happened exactly

[off-topic]

how wide is one of the boxes ?

[/offtopic]

[Owners1 0]

22.5 inches

[Kanaworm$ 292]

Looks like the re-cone was done poorly and the person that did the re-cone did not shim the coil in the gap properly. Causing the coils to rub against the pole. DD should take care of you .... For a price. PWK works closely with DD so I am sure his design would work with that series.

[Thumpper 266]

DD subs do smell some what....I would say it's more of a problem with

the recone alignment

[///M5 2,833]

How did you blow your temporary subs too? Are you deaf? It is rather easy to hear when a sub has reached a point of no longer being happy and is about to go. First things first you should evaluate what you are doing as it doesn't add up.

[Owners1 0]

How did you blow your temporary subs too? Are you deaf? It is rather easy to hear when a sub has reached a point of no longer being happy and is about to go. First things first you should evaluate what you are doing as it doesn't add up.

oh I knew they were being massively overpowered.. I just didn't care lol. I hooked it up to .5 ohms which is about 7k on my amp and they are rated for 1k each.. go figure

[Punkeyboozter 19]

How did you blow your temporary subs too? Are you deaf? It is rather easy to hear when a sub has reached a point of no longer being happy and is about to go. First things first you should evaluate what you are doing as it doesn't add up.

oh I knew they were being massively overpowered.. I just didn't care lol. I hooked it up to .5 ohms which is about 7k on my amp and they are rated for 1k each.. go figure

any vids of this episode?