Pass Labs X2.2 - Manual (Page 3)

3 X2.2 Owner’s Manual
The preamplifier has four sets of input connections, both single-
ended and balanced output connections, and a separate tape loop.
The preamplifier’s voltage and current rating are indicated by affixed
tag on the bottom of the preamplifier. It will indicate either 240
volts, 220 volts, 120 volts, or 100 volts. A 0.5 amp 3AG slow blow
fuse is provided with 100-120 volt units, and a 0.25 amp slow blow
fuse is provided with 220-240 volt units. The frequency rating of the
power supply is 50 to 60 Hz in all cases. The preamplifier typically
draws less than 30 watts during operation. Please verify that the
indicated voltage requirement of this preamplifier is consistent with
the voltage at your location.
We have provided a standard IEC AC power cord that fits into the
IEC line receptacle at the rear of the preamplifier chassis. The
preamplifier is equipped for operation with an earth ground provided
by the user’s AC outlet. Do not defeat this ground. The circuit
ground of the preamplifier is connected to earth and power ground
through a power thermistor, which gives a ground connection for
safety but helps avoid ground loops.
There are a total of four inputs and a separate tape loop. Two of
the four inputs can be used single-ended or balanced. The other two
inputs are single-ended only. The tape loop has both single-ended
and balanced inputs and outputs. Balanced inputs and outputs are
via XLR connectors. Single-ended inputs and outputs are via RCA
connectors. On the XLR connectors, pin 1 is grounded, pin 2 is the
positive signal, and pin 3 is the negative signal. Left channel RCA
connectors are marked with “L” from below. Right channel RCA
connectors are marked with “R” from below. Balanced XLR inputs
and outputs are marked with “L” for left and “R” for right channel.
If your signal source is unbalanced, input will occur through the
RCA input connector, which is in parallel with the XLR connections
1 and 2. When single-ended inputs are used on input 1 and input
2, a shorting plug is provided between pins 1 and 3 of the XLR
connection, shorting the negative input to ground, and providing
optimal performance.
The unbalanced input impedance of the preamplifier is 33 kOhms.
In balanced mode, the input impedance is higher, with a differential
impedance of at least 66k Ohms.
Next to the inputs on the rear panel, the preamplifier offers tape
inputs through both XLR and RCA connectors. This output is a
direct connection to inputs 1, 2, 3, and 4 when they are selected from
Setup