Preamplifier Owner's Manual X2.2

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