The menu shows the default settings. if you want to return to the default parameters, you can also press and
hold down the Down key in the shutdown state at the same time to boot. Three seconds after powering on release
the button and then it will be restored to the factory settings.
5. Menu introduction：
When the main interface status press Menu to enter, the following were introduced
to each line of the menu.
a.PCM FILTER（PCM 数字滤波器调节）：
PCM FILTER：
X22'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 groups. 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（DSD 数字滤波器调节）：
X22 DSD 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.DPLL BW（数字锁相环带宽调整）：
The digital phase-locked loop has a total of two(NORMAL / HIGH) kinds of bandwidth
for adjustment. Under normal circumstances, select NORMAL to match the most sources.
When the DAC-X22 always out of lock, you can choose HIGH bandwidth to provide
greater jitter tolerance, but at the same time there is a slight degradation in
performance.
