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When the M15S is connected to fast charging adapter, the enhanced Ultra
high mode could be enabled.
Lowpass filters mode
There are 7 different filters built in the M15S for your preference.
Filters are the sound effects born with the chip, which only has slight
adjustments for the sound. Here are some introductions to some filters. These
are only for reference since actual listening also has something to do with the
matched device.
1) fast roll-off,linear phase filter: Most Common filter with clean suppression
and high rejection, best for music with high transients. Provides crisp clean
highs
2) slow roll-off,linear phase filter: coherent and clear sounds, positioned near
the middle. It is suitable for classical music.
3) fast roll-off, minimum phase filter: Minimal Pre- Ringing, preferred for
Imaging and soundstage. No aliasing in frequency domain. Stronger bass than
Linear Phase,clean highs
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