Pass Labs X1 - Manual (Page 3)

3 X1 Owner’s Manual
The preamplifier main chassis / control unit has four sets of input
connections, both single-ended and balanced output connections, a
tape loop and a full function remote control that mirrors the front
panel functions.
The main chassis also has a DB-25 connector that connects to the
remote power supply and a single pair of 5-way binding posts that
are used for remote amplifier turn-on. The preamplifier’s voltage
and current rating are indicated on the bottom of the power supply.
It will be either 240 volts, 220 volt, 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 in all cases is 50 to 60 Hz. The
preamplifier typically draws 30 watts during operation. Please verify
that the pre-amplifier’s indicated voltage requirements are consistent
with the voltage available at your location, prior to operation.
The main preamplifier chassis is connected to the power supply
with a custom shielded cable that carries both the analog and digital
power. Please note this power cable must be installed before
the preamp is powered up. The power cable plugs, into and then
screws into, the rear panel of the main chassis and the power supply.
The connectors are a tight fit but should never need to be forced.
The X1 will function with either DB-25 on the power-supply chassis.
The additional DB-25 is for future performance enhancements.
We have provided a standard AC power cord that fits into the
IEC line receptacle at the right rear of the power supply chassis. The
preamplifier is equipped for operation with an earth ground which
is provided by the user’s AC outlet. Never defeat this ground, its
use will not adversely affect the performance of this product. The
chassis and circuit ground of the preamplifier are connected to earth
through a power thermistor, which gives a ground connection for
safety but helps avoid troublesome ground loops.
The X1 has a total of four inputs and a separate tape loop. Two
of the four inputs (Input numbers 1 & 2) can be used single-ended
or balanced. The other two inputs (inputs 3 & 4) 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 white spacers. Right channel RCA connectors are marked with
a red spacers. Balanced XLR inputs and outputs are marked with
“L” for left and “R” for right channel.
Setup