@geoffkait
Yes, I have read Stax was claiming at least 150 hours of burn-in (SR-009 headphones) at the factory. This was said to be done not for sonic development, but for weeding out early-failure drivers, known by consumers as the infamous driver imbalance issue - which became problematic during early runs of the 009 several years ago. There was speculation the problem became worse with the new PEEK diaphragms used in the 009.
My original 009S (one of the very first) actually still developed the imbalance issue after several hours. It was immediately replaced by my dealer, and the 2nd pair has been perfect - it's possible they truncated the burn-in during the rush to fill pre-orders? I didn't have the issue with any other Stax headphone, but by the numbers the 009 production seems to have had the worst bout of it.
Yes, I have read Stax was claiming at least 150 hours of burn-in (SR-009 headphones) at the factory. This was said to be done not for sonic development, but for weeding out early-failure drivers, known by consumers as the infamous driver imbalance issue - which became problematic during early runs of the 009 several years ago. There was speculation the problem became worse with the new PEEK diaphragms used in the 009.
My original 009S (one of the very first) actually still developed the imbalance issue after several hours. It was immediately replaced by my dealer, and the 2nd pair has been perfect - it's possible they truncated the burn-in during the rush to fill pre-orders? I didn't have the issue with any other Stax headphone, but by the numbers the 009 production seems to have had the worst bout of it.