XP 20 Owners Manual Rev 0.4
11
processor. Both of these default conditions are intentional, and intended to make the
most advantageous use of your source electronics.
You may also set any input to unity (0 dB) by setting the volume at step 75 from the
remote or front panel control.
Before selecting the theatre pass through (pass thru) option, it is imperative that the
input device on input number 5 has its gain set to minimum. Failure to follow this
precaution could result in a volume level intolerable to both ears and speakers. (The
standard 2 volt source component, with the pre-amp set to 0 dB, will drive most power
amps to full rated output.)
As an added precaution selection of “pass through” is a two-part command. First
operation will bring up a Yes prompt on the display, repeating the first command
operation is required to complete the command. To exit the “Pass Thru” function the
“Pass Thru” button on the remote control must be pushed to unlock the remaining
command functions. When “Pass Thru” is de-selected the XP-20 reverts back to the
previous input, volume and balance settings.
Input 5 may be manually selected and used without the “pass thru” function, in which
case its behavior will be identical to inputs 1-4.
The electronic volume control allows greater than 80 dB range and is driven by a micro-
controller that reads the optical encoder serving as a front panel volume control.
In this manner tracking of the volume of the two balanced channels is possible with
accuracy unavailable on any ordinary analog volume control, assuring precise level
steps and high common mode noise rejection in balanced circuits. Wayne Colburn's
exceptional volume control in conjunction with the fluorescent display give the user
ability to replicate volume levels with absolute accuracy in steps of roughly 1 dB or less.
