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XP-12_om_10.17
BALANCE: Pressing balance left (<) or balance right (>) will increase
the level in the left or right speaker, depending upon which button
is pushed.
VOLUME: Pressing the increase (^) button or the decrease (v)
button will shift the volume setting 1dB, holding a button down will
increase or decrease the level until such time as you either release
pressure on the button or reach the limits of the volume control.
PASS THRU: Pushing this button twice, sets the pre-amplifier to
volume step 89 (0 dB) and input 5. As an added precaution when
“pass through” is selected the volume ramps upto 89.
This is to prevent nasty surprises when “pass thru” is selected
accidentally. The ramp up sequence can be stopped at any time
by hitting any button on the remote.
The button must be pressed again to exit “Pass Thru” and unlock
the other command selections.
DISPLAY: The default setting for the display is “bright”, pressing
the display button once changes the display to its “dim” or “low
intensity” setting, pressing the button a second time selects “off”
for the display. When “off” is selected any other control function
will cause the display to indicate product operational status for
approximately 7 seconds and then the display will once again
blank. Pressing the display button a third time cycles back to a
“bright display”
We recommend the use of the balanced output mode where
possible. Balanced input to power-amplifiers will typically retain the
character of the input mode, but offers less distortion, less noise,
more gain, and more voltage swing, without compromising the
sound.
With balanced operation, the common mode rejection of the
preamp reflects the intrinsic common mode rejection of the
topology, the matching of the gain devices, and the matching of
the attenuator channels. In this case we have been able to keep
the total mismatch to about .1%, for a common mode rejection of
approximately -60 dB.
The input system of the preamplifier will exhibit full common
mode noise rejection with passive balanced sources, where the
negative input is connected to ground at the source through
the appropriate source impedance. This allows adaptation of
unbalanced sources to balanced operation with passive cable
connections in a manner that achieves the noise rejection of active
balanced sources.
