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Operation:
The XP-32’s front panel controls and display are straight forward and intuitive. We
encourage you to become familiar with their operation prior to use.
After all the input and outputs are connected and double checked, you can now
attach the AC power cord and turn the unit on from the rear panel switch located
next to the AC inlet on the rear of the power-supply / control unit.
On the front panel the left-most “MUTE” switch when on silences the output of
the pre-amp, illuminates the associated LED and blanks the volume step numbers in
the alpha-numeric front panel display. Pressing the mute a second time re-establishes
output, extinguishes the associated LED and re-instates the volume step numbers in
the display
The front panel “MODE” switch cycles the front panel display through three
different levels (Bright-Dim-Off) Using any control function of the XP-32 with the
display “off” will momentarily bring the display back up to the dim setting.
The two input selector switches (designated by left and right pointing arrows) then
alter the displayed active input, 1 through 5. The two additional inputs (home
theater and tape) are selectable only from the hand remote.
Before selecting the home theater pass through (pass thru on the hand remote), for
the first time, it is imperative that the input device on the HT input have it’s gain set
to zero Failure to follow this precaution could result in a volume level intolerable
to both ears and speakers. Selecting home theater bypass, sets the gain of the pre-
amplifier to 0dB (gain of 1x)
When the Pass Thru function is selected volume control of the system is under
control of the device connected to “Pass-Thru” and the XP-32 is essentially
invisible. When Pass-Thru is selected the display will show “PASS THRU” and the
volume will quickly ramp from 000 to 179 in both right and left channels (each step
representing 1/2 dB) Volume step 179 represents the afore mentioned 0dB gain for
use with components such as a home theater processor that best function with their
own internal volume controls. (NOTE: you may set any numbered input to “Unity”
(0dB by manually selecting an indicated level of 179 on the XP-32 display
The electronic volume control of the XP-32 allows for 100 dB range in 0.5dB steps
and is driven by a micro controller, reading an optical encoder serving as the front
panel volume control. assuring precise level steps with an absolute increment of 0.5
dB. This allows for accuracy and channel to channel tracking that is not available
in more traditional volume controls and preserves high common mode rejection of
signal in a true balanced circuit.