5.Menu Function Introduction
In main menu status, press the Menu button to enter the setting menu. The following
is a line-by-line introduction.
a. PCM FILTER:
The filter can work in six modes: SHARP——SLOW——SUPER SLOW——SHORT SHARP——LOW-d
SHORT——SHORT SLOW. Switched by the Volume knob. SHARP for rapid roll-off digital filtering,
the most common type of digital filters, listening to the sense of the most accurate, neutral; SLOW
for slow roll-off, which has a smooth signal attenuation characteristics of the out-band, but also
because of the audio-band Attenuation characteristics, will make the sound becomes a softening
effect; SHORT SHARP / SHORT SLOW for the short delay version of SHARP / SLOW, listening to
feel close substantially. SUPER SLOW is similar to the effect of NOS, both ends of the extension
to reduce the frequency of natural suitable for human voice. LOW-d SHORT is a new filter in AKM
AK4497 chip, the effect of combining some of the characteristics of other types of filtering.
b. DSD Filter
DSD filter can work in 2 different bandwidth. L-BW for low bandwidth; H-BW for high bandwidth.
AK4497 does not have a fixed frequency point as the filter cutoff frequency. but switch
automatically according to the DSD sampling rate.
The cutoff frequency is shown in the table below.
c. GAIN：
The Amp has two levels of Gain to select. The HIGH gain is 12dB higher than the LOW gain. Can be
adjusted according to different sensitivity of the headphone to achieve the best match. We
recommend to use low-sensitivity headphones HIGH, high sensitivity headphones with LOW.
d. PRE MODE：
The rear panel has RCA and XLR output, you can switch between different modes of output. When
PRE MODE is OFF. The RCA and XLR outputs are output directly as DAC decoded signals. and the
volume cannot be adjusted(Not through the volume adjustment circuit). When PRE MODE is ON, the
RCA and XLR outputs signal in high-quality segmented volume or pre signal.60-level volume
adjustment and GAIN adjustment. Used to match the active monitor speakers or as a lossless
volume adjustment.
e. PHASE INVERT：
The RCA output default is positive phase. XLR balanced output default is the American standard
polarity output. That is 1 Ground 2 Hot 3 Cold. There are two options for this function: DISABLE
and ENABLE.
f. BRIGHTNESS
There are 8 levels of OLED screen brightness to adjust.
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