- Pass X250.5 Owner's Manual

X250.5 Owners Manual

the back of the amplifier, and then into the wall. Then turn the breaker

switch on (up). The lights in your house will blink when the power sup-

ply charges the capacitors; this is nor mal. This magnetic breaker switch

is not to be used as a safety disconnect during ser vicing and is not a

substitute for unplugging the power cord.

On the front panel, the “Standby” LED indicator should be glowing

blue, indicating that the power is on. The “Power” LED should not be

on. If the “Power” LED is on, don’t g et excited, just use the front panel

stand-by button to go into stand-by mode, with the “Standby” LED on

and the “Power “ LED off.

OK, so the amplifier is sitting there in stand-by mode with just the single

blue LED lit. No speaker connected, as yet. You can go ahead and con-

nect the source and speakers. Some speaker cables are ver y difficult to

work with due to physical size and construction, make sure the speaker

connections do not short together. It is recommended that you connect

the speaker ends of these cables first.

Some powered subwoofers require an audio signal ground reference and

their makers may sug gest that a black speaker ter minal is where this volt-

age reference might be found. On complementar y designs, which would

be typical of all power amps produced by Pass Laboratories™, this is

an incorrect and unsafe assumption. On all Pass Laboratories™ power

amplifiers a reference of 0 volts will be found only at pin 1 of the XLR

input or at the shell of the RCA input.

Reference connections for these devices require special consideration

when used with our product. If you have such a device, and wish to

use it with our product, please contact our Foresthill, California fac-

tor y for specific instr uctions.... you have been warned.

The amplifier can be driven single-end or balanced, if driving the am-

plifier single-ended, leave the supplied jumper in place (between pins

1 & 3 on the XLR). Your amplifier will operate without the jumper

in place, but perfor mance will be significantly diminished. You must

choose either XLR or RCA inputs it is not advised to try and r un both

concur rently.

Now that the source component is connected, make sure there is no

signal coming from it, probably by turning the volume all the way

down.

With the speakers connected, push the front panel button to activate

the amplifier. The “Power” LED will come on.