Im getting some serious vibration from 70 to 80hz on my kappa perfect sub... whats up

[Inertia]

Not sure why it started happening now because it wasn't happening before but starting around 70 cycles to 80 cycles on my test tone cd my kappa perfect build is vibrating BADLY! Not sure why it wasn't happening before.... any ideas to fix the problem? I have mineral wool on the whole large brace panel.... just really weird why it wasn't happening before. I am confused.

 

[Haoleb]

There is most likely just something thats loose. Is it coming from the driver itself or from the cabinet? You'll have to listen carefully because its sometimes difficult to tell.

I was getting alot of buzzing from my subs with the spikes I put on them.. Just this weekend actually i dissasembled the entire rig to clean everything and put teflon on the threads and rubber washer between the sub and the spike... Theres also a list 2 pages long of other things througout my house that vibrate at certain frequencies. Might take a while to squash them all

 

[Inertia]

Thanks for the reply... you know i think it may be the sub itself but I am not positive. What could possibly be loose? I am hoping its the sub because I can get a new one easy enough with the warranty.

 

[TLS Guy]

Thanks for the reply... you know i think it may be the sub itself but I am not positive. What could possibly be loose? I am hoping its the sub because I can get a new one easy enough with the warranty.

If it is the driver, the problem could be that the voice coil is unraveling, or cone voice coil separation is starting to occur.

 

[WmAx]

First, try setting the cabinet on a soft surface. Maybe put a cushion/pillow under several points to suspend it. If the noise persists, then you'll need to remove the driver and place it on a cushion or pillow and then slowly bring up the volume with a sine wave sweep to see if the sound is originating from the driver. From there, you'll be able to deduct if the noise if coming from the driver or the cabinet assembly.

-Chris

 

[MidnightSensi]

Another thing it could be: Usually subs come with little plastic/stickers on the back of the motor to protect it from shipping dust and debre. If you forget to remove it when you put it in the enclosure it generally makes a rattling noise around that frequency.

 

[lsiberian]

could also be your cage. Maybe someone is rattling your cage

 

[Inertia]

Wmax:
I put the cabinet on pillows and it is definitely still vibrating. I am going to take the woofer out of the cabinet and try what you said. Hopefully its the woofer.

 

[Inertia]

I took the sub out and i don't think it is the sub that is making the noise I believe it is the cabinet.... what do I do?

 

[Inertia]

Would dynamat on all the walls help anything?

 

[Matt34]

I took the sub out and i don't think it is the sub that is making the noise I believe it is the cabinet.... what do I do?

I'd start looking for air leaks in the cabinet.

 

[Inertia]

I really don't think it sounds like an air leak.

 

[Matt34]

I can only think it if you isolated it to a cabinet problem that it's either an air leak or loose brace or both.

 

[Inertia]

Check this out... this is weird.... when I just set the sub in the hole without mounting it with the screws, no vibration. Now after i tighten down the screws a bit theres vibration. Should I get some foam tape and try running it around the lip of the sub?

 

[lsiberian]

Check this out... this is weird.... when I just set the sub in the hole without mounting it with the screws, no vibration. Now after i tighten down the screws a bit theres vibration. Should I get some foam tape and try running it around the lip of the sub?

Sounds like you may have a screw loose. Maybe your drilled holes are too big. And the screw isn't going in snugly Or you aren't tightening the screws enough. I suggest you lightly shake the cabinet listening for the loose screw.

 

[Djizasse]

Or maybe with the screws in place, the driver is coupled to the cabinet and makes it rattle. Could it be the audio cable not properly secured?

 

[lsiberian]

Or maybe with the screws in place, the driver is coupled to the cabinet and makes it rattle. Could it be the audio cable not properly secured?

That's a possibility, but I think that's less likely.

Make sure you tighten the screws very well. You may need to up the screw size too. I'm trying to engineer other ideas. I wonder if you isolated the screws from the structure if that would help? Basically the screws my be conducting the frequencies more easily. A change of screw type could help too.

Though I would yield to the expertise of Wmax, TLS, and Andrew in this matter.

 

[lsiberian]

Check this out... this is weird.... when I just set the sub in the hole without mounting it with the screws, no vibration. Now after i tighten down the screws a bit theres vibration. Should I get some foam tape and try running it around the lip of the sub?

This may work. I hope you have already taped the area between the woofer and the structure.

 

[Inertia]

I had a little bit of foam tape but not much. I need to go to the hardware store and get some.

 

[lsiberian]

I had a little bit of foam tape but not much. I need to go to the hardware store and get some.

Definitely. Remember your sub is a wave generator that can vibrate anything if not secured and protected.