Fix for SRH440 mechanical noiseFAQ #4680
1) One SRH440 owner reported success in eliminating a "creak" by spraying silicone lubrication (sold at hardware stores) on the moving joint. Do not use oil of any type as oil can attack/soften/dissolve plastic.
2) Another SRH440 owner added felt pads to the ear cups. See the photos below.