Cannot figure this out...

[bobo244 10+ year member]

its really not that long... but please need some expert help

Ok installed my new setup, Viper 2500.1 and 3 12w6v2's. Each sub is Dual 4 and wired at an 8 ohm load, bringing the total load to 2.7ohms. At 2,7 each speaker is getting around 600wrms. Everything was fine it was working great and hitting wonderfully loud and clear. And then all of a sudden I hear a little pop or crackle. Turn it down and then slowly turn it back up. Noticably not as loud. Sounds fine and then I am listening to a heavy bass song and i hear it again. Check the subs, and I can hear it is coming from the middle sub. Turn it up and then it keeps making the noise when I turn it up loud.

I thought there was no way that I could have blown the sub after 10 minutes, I set the gains with a DVM and did not ahve the HU into clipping. So I take out the middle sub and put it in a different, w6v2 perfect conditon. Same result, from the same middle sub, even though the sub I put I KNOW is fine.

I look at the amp and one of the grounds fell out of the plug (the 2500.1 has 2 power and 2 grounds). I think ok this must be in and put it back in. Nothing changed. Except now, the subs will hit, the center one will make that noise, they will stop playing, and then play 100% a few seconds later and then cut out again. Meanwhile this whole time the amp does not go into protect etc.

I check all power and grounds, check speaker leads make sure they are not touching, check remote wire, RCAs are brand new, ground point is clean, etc. I cannot figure out what is going on, I look at both the subs making the noise and they do not seem blown at all, no smell no marks and I can push the cone in and out no problem.

Are the two subs blown? Why is it the middle sub makes the noise, i replace it with a new one, and then the new one makes the noise?? I checked the wires inside the box, fine. WHAT IS GOING ON?????????????/

PLEASE HELP!!!

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[zachzchw 5,000+ posts]

Did you check the coils on the subs with a DMM?

And is it a seperate chamber box, or common chamber?

 

[bobo244 10+ year member]

Did you check the coils on the subs with a DMM?And is it a seperate chamber box, or common chamber?

common chamber box.

No I didnt check the subs with a DMM, please tell me how...

But why would the center speaker blow twice??? I think that is a little too coincidental. There has to be something wrong with the wiring because all the subs are getting the same exact signal.

 

[zachzchw 5,000+ posts]

It does seem strange. Especially since youve went over all of your wiring again to be sure it was right. The only thing I could think of would be the air pressure of the sub on the right and left pushing the middle sub too far, screwing with its suspension. To check it with a dmm, just put the ends of the meter on the positive and negative of the coil, it should read around 4 ohms. Do the subs look okay or show any signs of damage?

Hopefully someone with more knowledge will come to this thread and get the problem solved for you.

 

[bobo244 10+ year member]

The subs look fine, When i push the cone in and out, its not too easy not too hard, just like the others. No noise, nothing. I will test it right now.

 

[bobo244 10+ year member]

come on... someone has gotta have something

 

[Bigrick31 10+ year member]

how exactly do you have them wired in parallel? or are they all seperate then just go into the amp? if so check the polarity on each one make sure the positives are ALL going to the same place and that the negatives are ALL going to the same place. also chack for air leaks around the sub place you hands around the outer edges of the sub that has the problem as if to cover a leak that may or may not be there and see if its better.

 

[bobo244 10+ year member]

how exactly do you have them wired in parallel? or are they all seperate then just go into the amp? if so check the polarity on each one make sure the positives are ALL going to the same place and that the negatives are ALL going to the same place. also chack for air leaks around the sub place you hands around the outer edges of the sub that has the problem as if to cover a leak that may or may not be there and see if its better.

each sub is at 8 ohms. All the positves from the 3 sub are brought together inside the box, as well as the negatives, and send out the back of the box to the amp.

There are a 2 small holes in the bottom of the box from drilling that i will patch up, but i dont see how that could cause any problems like this. I will check for air leaking around the sub tomorow. But i dont see that as the problem either because the signal will cut in and out and the subs will play very very quiet even at full volume and then jump back up to loud and then cut and play quiet again.

 

[bobo244 10+ year member]

hooked up the DVM to the sub,

one coild read 3.3, the other 3.2

when in series it read around 6.5-7 and when in parallel in read about 1.4-1.6

The sub is dual 4

are these readings normal?

 

[Raven 10+ year member]

Yeah, sounds like normal readings. My only assumption is that you're running into trouble with airspace and pressure trying to kill off the middle sub. Seeing as you have the money to keep throwing W6V2s at it, instead toss a passive radiator in there and see what you get.

EDIT: and by passive radiator I mean a fried sub just not wired in.

 

[MadAudio 10+ year member]

i know u tried a different sub but..

did u try swapping sub positions?

u know for a fact the ones on the left and the right work perfect put one of those in the middle and the original from the middle into the left or right spot depending on what one u moved to the middle this will prove if its something other than the sub i think.

or the connection from a subs terminal to the coil is bad when the bass hits speaker stretches breaks connection throws ohm load off middle sub gets massive spike hey its a theory ok hehe

but it sounds to me like a problem with air space ive heard that popping sound but usually its when a box is two big providing no cushion for the sub but i guess it can happen the other way subs trying to push down while the power from the two other subs pushed it up

personally im not a fan of shared chamber sub boxes i know people say there is no sound difference but my reasoning is ... subs for the most part are made of natural material metal,rubber,paper and no matter how good your production facilities are natural materials will vary slightly

( same reason why one coil measured 3.3 the other 3.2) one sub hitting harder than the other will throw things off i know alot of people will disagree but hey its my opinion //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

 

[zachzchw 5,000+ posts]

I was gonna suggest switching sub positions, but if something is damaging the subs, he doesnt want to keep screwing them up.

What you could do is put the two possibly screwed subs in, one in the middle, and see if both of them make the same noise, or its just whichever sub is in the middle.

 

[squeak9798 5,000+ posts]

Honestly, it sounds to me like for some reason the wiring to the middle sub is causing it to short out.

 

[Decipha 10+ year member]

I don't know about yall but to me it sounds like the amp, if it cuts out and comes back chances are its got a good connection to the amp and im dumbfounded about the middle sub blowing, if all else fails try using a different amp and see if you still have the same problem, if you keep hearing the sub noises than you probably need a new box

 

[bobo244 10+ year member]

alright everyone i appreciate the input. I will trying switching positions later today, but i am pretty sure that the same result will happen, but ill try.

I think it has to be wiring because they were playing fine and very loud for a good 10 minutes. And now they give problems right away, even after putting in the new sub which leads me to believe that it has nothing to do with the sub or the box, however I could be wrong but it just doesnt make sense.

The box has A LOT of polyphill in it, maybe that might be the reason. I will try and take some out, but the fact of the middle speaker only making noise leads me to believe that there is a wiring problem somehwere.

Il try everything this afternoon and let you know the results.