Pass Labs XP-20 owner manual In’s and Out’s

In’s and Out’s

XP-20 Owner’s Manual

As with all audio electronics the power cable should be the last thing attached and the first one removed any time you hook up or remove equipment from the signal chain. The DIN-25 umbilical cable should never be connected or removed with the power supply chassis plugged into house power.

The preamplifier has five sets of stereo input connections, both single-ended and balanced output connections and a full function remote control in addition to the normal complement of front panel control functions.

The preamplifier’s voltage and current rating are indicated by affixed tag on the rear of the preamplifier’s separate power supply. It will indicate 240 volts, 220 volts, 120 volts, or 100 volts. A 1.0 amp 3AG slow blow fuse is provided with 100-120 volt units, and a

0.50amp slow blow fuse is provided with 220-240 volt units. The input frequency rating of the power supply is 50 to 60 Hz. The preamplifier typically draws approximately 25 watts of power from the utility mains during operation. Please verify that the indicated voltage requirement of this preamplifier’s power supply is consistent with the utility voltage at your location.

We have provided a standard IEC AC power cord that fits into the IEC 320 line receptacle at the rear of the power supply chassis. The preamplifier and power supply is equipped for operation with an earth ground provided by the users AC outlet. Do not defeat this safety ground. The chassis and circuit ground of the preamplifier is connected to earth through a power thermistor, which gives a ground connection for safety but helps avoid ground loop related noise issues. Please connect the power supply to the preamplifier chassis by the supplied umbilical before plugging the power supply into

the wall. Conversely please unplug the power supply from the wall before disconnecting the umbilical cable.

There are a total of five inputs. Two of the five inputs are balanced XLR only. The other three inputs are single-ended only. The XP-20 also has a “Tape Loop” with single ended inputs and outputs. There are three pairs of outputs available with identical gain structure. One pair Balanced, two pairs single-ended. You may use more than one output at a time.

The single ended outputs are paralleled, but under most circumstances will drive several devices at once, with no anticipated ill effects by virtue of the XP-20’s low output impedance and high current capability. The balanced outputs are derived from their own

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