5. Menu introduction：
When in the main interface.Hold down the knob for 2s to enter the menu（For two more second to
cancel or after 30s back to the main interface）.The following were introduced on each line of the
menu:
a.PCM FILTER:
X20PRO's filter can work in seven modes：M-SHARP —— M-SLOW —— L-SHARP —— L-SLOW ——
HYBRID —— APODIZING —— BRICKWALL switched by the knob
SHARP/SLOW filter divided in two group.One is MINIMUM PHASE start with M-.The other one is
LINEAR PHASE start with M-.SHARP for rapid roll-off digital filtering it is the most common type
sounds most accurate and neutral.LOW slow roll-off.which has a smooth signal attenuation
characteristics of the band.but also because of the band Attenuation characteristics.MINIMUM
PHASE and LINEAR PHASE have the different Impulse response.MINIMUM PHASE without
pre-ringing but long post-ringing.Can be more harmonic overtones.HYBRID Combined with the
characteristics of the two.Sometimes could have the advantages of two.APODIZING is a unique
filter could conceal the Pre-ringing(a type of digital distortion will resulting in some unnatural sharp
or harsh sound).BRICKWALL the filter is sharp roll-off and clean sound.
b.DSD Filter:
X20PRODSD filter with 4 different bandwidth can be selected.Rotate the knob to select in
47K——50K——60K——70K circularly.According to the sampling rate to adjust.47K is recommended
when listen DSD64（2.82M）.The larger bandwidth means more treble detail
c.GAIN:
The high-performance fully balanced analog circuit in DAC-X20 has a 3-level gain adjustment to suit
for different input sensitivity back-end equipment for achieving the optimum signal matching
performance. After entering the corresponding menu item and the gain can be changed in values 0dB,
+6dB, and +12dB.
* If the volume of the back-end equipment can be adjusted, the volume and gain are recommended to be set at 0dB, namely straight
connection.
d.MCLK MODE:
After many years of research and development.X20PRO archive this unique function.In order to set
the ES9028PRO in the best clock environment.True HI-END performance.When select
AUTO.X20PRO will enter the adaptive master clock mode.A more accurate clock will be obtained by a
set of high performance PLLs (phase-locked loop), and it will then be fed to the ES9028PRO DAC.
Because the signal clock and the master clock are not the conventional asynchronous mode, the digital
interpolation filter inside ES9028 will no longer produce a weak timing error (jitter), and the digital
signal will be more accurately recovered. When selecting “Normal” option, the clock mode becomes to
the normal mode, which is the official ES9028PRO asynchronous mode.
*Under the “Auto” mode, the quality of the master clock of DAC-X20Pro will be more or less depended by the quality of the superior
clock. This mode is recommended to be used only for the clock of the front-end audio equipment in good condition.
