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Fiio M21 - Page 26

Fiio M21
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22
whenever possible (Adaptive Bitrate). Only applicable for Bluetooth
transmission.
Bluetooth volume adjustment mode
This function is only available for Bluetooth transmission, which features “Sync
Bluetooth volume” and “Indep Bluetooth volume”. The Sync Bluetooth volume
should also be supported by the receiving device, otherwise, it will be
unavailable. The Indep Bluetooth volume means the volume adjustment of the
receiver and transmitter is independent of each other. The Sync Bluetooth
volume mode can solve the issue of overly small volume when connecting to
some Bluetooth headphones, such as AirPods.
Balance
Channel balance means, by adjusting the output amplitude of the left or right
channel individually to build up a special listening condition suitable for the
users. For users who have no difference in hearing between left and right ears,
there is no need to use this function, as the output of the left and right channels
of the device is balanced. The default value of channel balance is 0, each of the
left and right channels can be adjusted by 20 levels, and each level has a fixed
difference of about 0.5dB.
All to DSD
After turning on the All to DSD, the global PCM audio will be converted to DSD
for output, and the sound quality will be further improved.

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