Question Strange sound while softening my new subwoofer

Oct 28, 2021
Hello guys!

I've just received a brand new subwoofer (Edifier T5) and I went straight to soften it - played a 20hz sinusoidal wave for over 4hs with a low volume. Then I bumped up the volume a little and started noticing a small 'clicking' sound, coming from inside the subwoofer - it is like something was lose and bumping on the subwoofer as it moves back and forfh


The more I bump up the volume, the higher this sound gets.

Is this normal? Should I call edifier and maybe send it for the warranty?
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