Do you hear the knocking sound regardless volume and frequency? If you gently push the woofer inwards without playing music, do you hear a scraping noise? Have you tried to turn the speaker upside down and listen for loose parts? Is the woofer dented?
Living room: Kii Three/BXT with Control.
Den: Tannoy Precision 8 iDP with TS112 iDP subwoofer.
In the cupboard, waiting for a sibling: 1st gen. Phantom Silver running DOS1
My Phantom Voyage
Den: Tannoy Precision 8 iDP with TS112 iDP subwoofer.
In the cupboard, waiting for a sibling: 1st gen. Phantom Silver running DOS1
My Phantom Voyage
