6. What are the differences between the audio filters? And how to change it?

The flagship FH9 comes standard with three interchangeable audio filters. Each audio filter has its own damping and filter density, allowing you to choose between three different sound signatures:

Red audio filter--Enhanced, dynamic bass focus

Black audio filter--Clear, transparent, balanced timbre

Green audio filter--Highly resolving, detailed treble focus

*The black audio filter comes pre-installed. Other filters are included as accessories.

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