IDQ making slaping noise at higher volumes

[madmaxz 10+ year member]

got a brand new IDQ from a guy off craigslist put it in a box that was 1.25 cubes with some 2x4's taking it down to .9-1 cubic foot. i checked all day for leaks im sure its its 100% sealed. it sound great at low to medium volumes but as soon as i crank it any i get and slapping/rattling noise coming directly from the sub. amp is a alpine mrp-m500 with digital controls. gain is at 0db and output level is -10db. i have been having problems with the amp shutting off at high volumes with the IDQ. Not sure what the problem is with that. i was pushing 2 re sr10's at full power without a problem a few days ago. wiring is dual 2/0 welding wire and 2 ground points 2ft of 2/0 to the chassie and a 4 guage run to - side of the batt. voltage reads 13.9-14 when truck is running. IDQ is dual 4 ohm wired in parallel to 2 ohm. i have speaker wire from VC 1 to VC 2 ++ / -- and then wired to the box from 1 VC +/- .

I pushed down on the cone outside the box and i feel it barely tap something unless i push slow absolutely directly in the center of the sub.

IDEAS? sub is fuked? amp is fuked?

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[microhaxo 10+ year member]

Take the sub out and push down, observe how it moves and check how the spider moves, my old PG RSDC used to hit the tinsel leads when it went down far.

Its far easier to check for problems when you can look at the sub from many angles.

 

[madmaxz 10+ year member]

did that definitely not hitting the tinsel leads. the way the IDQ is setup they dont stick up at all the sub will bottom out before hitting them. also i can push down way farther then the sub is going when running.

 

[madmaxz 10+ year member]

I tested the VC's with a old Analog multimeter and the ohm reading was just above .5 sub is toast

 

[BlurredVision 10+ year member]

hmmm.....I thought your subs slapping was a good thing?

 

[madmaxz 10+ year member]

deff not a good thing in this case

 

[madmaxz 10+ year member]

ok i got a new DMM and tested each VC alone and the connection at the box when hooked up. both VC's read 3.0-3.3 and the box read 1.9 so thats right.. i free aired it and i cant see it hitting anything but it sounds like it hits something when the copper wound pole goes into the magnet..

 

[Immacomputer 10+ year member]

It sounds like you're driving the sub too hard. They don't have very high excursion and definitely won't take well to a bashing from ~500 watts. If it's not giving you the output you need, try porting the sub in about 1-1.5 cubic feet tuning in the upper 20s to low 30s. That should help with output and may help with the bottoming out (assuming you were bottoming out around and below 40hz.

Contrary to popular belief, going ported can help with bottoming out and won't sacrifice any sonic clarity. My IDQ 12 did much better ported as far as range, output, and composure.

 

[madmaxz 10+ year member]

im pretty sure its not bottoming out because i watched it free air how far it was going down when i herd the noise and i can push it in another inch before it bottoms out. and the re srs i had had the same 18mm xmax and they sunk way deeper without any noise.

 

[Immacomputer 10+ year member]

Check and see if the rubber around the gasket is starting to peel up. The IDQ gasket is attached to the surround and if the gasket is coming up, it could cause the coil to be out of alignment.

If it's not bottoming out and the sound is coming from the coil, the coil must be misaligned then.

 

[madmaxz 10+ year member]

thats what im going with.. just a defective sub.

 

[madmaxz 10+ year member]

im either gonna order 2 more from woofersetc or just try 2 mag v4's this time

 

[madmaxz 10+ year member]

Here is a video

http://s614.photobucket.com/albums/tt221/madmaxz28/?action=view&current=MVI_0090-1.flv

 

[SlainNothing 10+ year member]

if its making noise...

bottoming out

tinsel slap

excess glue

the surround/cone has come unglued

***misaligned

 

[will3 10+ year member]

If it is the new v.3 with the removable core assembly it is possible someone removed it and did not center it when they reinstalled it.