Note: The Super high gain mode is hidden by default and available only when
inserting a fast charging power supply.
Lowpass filter mode
There are three different filters on the M21. You can choose them according to
your listening preference. Filters are some effects that come with the original
DAC chip, and the adjustment is subtle for the sound.
Bluetooth Audio codec
The default codec for Bluetooth transmission is the highest supported codec,
and you can select the supported codec through this setting.
Bluetooth audio codec LDAC (playback quality)
Allows switching between different playback quality modes for LDAC, including
options for prioritizing audio quality (990kbps/909kbps), balancing audio and
connection quality (660kbps/606kbps), emphasizing connection quality
(330kbps/303kbps), and providing optimal sound quality whenever possible
(Adaptive Bitrate). Only available for Bluetooth transmission.
Bluetooth audio codec LHDC (playback quality)
Allows switching between different playback quality modes for LHDC, including
options for prioritizing audio quality (900kbps), balancing audio and connection
quality (500kbps/560kbps), emphasizing connection quality (400kbps),
prioritizing low latency (256kbps), and providing optimal sound quality
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