Fiio M11 - Lowpass Filter Modes; Wireless Playback Quality

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Lowpass filter mode:
To set the filter modes: Sharp Roll-Off Filter, Slow Roll-Off Filter, Short delay
Sharp Roll-Off Filter, Short delay Slow Roll-Off Filter, Super Slow Roll-Off Filter.
Wireless playback quality:
When the Bluetooth receiver supports multiple Bluetooth audio encode (such as
BTR3), you can select which you want to use.