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I have sundown x12 v2 dual 4ohm wired to 2 ohms in a 2.5 cft box built to spec. Powering it is a kicker kxa 1600.1 rms @2 ohms . Gain is almost all the way down and there’s no clipping or distortion..... set it low to break subwoofer in for a week or two and then set accordingly with a SMD.

when I play at low volume I hear a rattle noise from woofer not knocking ..... is there a possibility that back of subwoofer is vibration against the box . There is supports inside for sub that’s why I’m questioning it . 
 

Also haven’t cranked on woofer yet I’ve  been going easy on it  

 

here’s a look at inside of box

 

3CA75009-11C9-46FC-A21A-82ECB9A7DB14.jpeg

Edited by Steve7384
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Could it be the amp sending a dirty signal?


Sundown NSV4 18"  +  Orion 5000.1dV2

MechMan Elite 370a  +  XS3100 - XP3000

SHCA 1/0 OFC(blue+  SMD Fuse Holders(blue)

Pioneer AVH-2440NEX  SHCA Pro RCA 

 

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Aww ok, not sure what it could be.  I have had two amps go out and before they did they were sending a dirty signal that made the sub sound like it was rattling at low volume.  Hope you figure it out because that shit is annoying.


Sundown NSV4 18"  +  Orion 5000.1dV2

MechMan Elite 370a  +  XS3100 - XP3000

SHCA 1/0 OFC(blue+  SMD Fuse Holders(blue)

Pioneer AVH-2440NEX  SHCA Pro RCA 

 

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If that bracing isn't fitting tight against that subwoofer definitely going to cause rattles try adding some weather stripping around the contact points where the woofer meets the bracing use the thick foam stuff and let it smash with the weight of the subwoofer

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