[Rattle noise]

Ok I'll give that a shot thank you 

[Rattle noise]

I hope not the authorized sundown dealer set amp and said it sounded clean And was surprised by the quality of amp

[Rattle noise]

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