Principle: The most important thing of All To DSD is to convert the digital signal
in PCM format to DSD format, so that the DSD format can be used when
performing D/A conversion to obtain different styles of sound, more clear and
natural sound. In addition, since the lowest DSD format is DSD64, which is 4
times the data of 44.1k/16bit only calculated from the amount of data, All to
DSD is also equivalent to up-sampling the PCM signal. The effect of All to DSD
also supports third-party apps.
Adjustable volume at LO
When Lineout volume adjustable is enabled, the volume during LO output will
be controlled by the buttons (including both single-ended and balanced LO).
Equalizer
The global PEQ function supports EQ superposition of the FIIO Music and other
third-party apps. Here are the processes after enabling the PEQ on the system.
(1) Over 192k sampling rate- SRC processing;
(2) Priority: All to DSD>PEQ>MQA.
Auto pause without headphones
When this function is enabled, under Android and Pure music modes, if the M21
is in music playback state without headphones connected, the system will
automatically pause playback after 2 minutes.
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