12. Is the FT13’s diaphragm waterproof? Will it be damaged in humid weather?

The FT13’s wool composite nano-fiber wood diaphragm is coated with a water-resistant layer. It has passed FIIO’s in-house reliability tests, which include but are not limited to high-temperature, high-humidity, low-temperature, and thermal shock conditions that far exceed typical daily environments. Both performance data and listening tests remain within standard ranges, so you can use it with confidence.

In addition, to extend the product’s lifespan, it is recommended to store the headphones in the provided storage case when not in use for an extended period.