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XA60 Owner’s Manual
On the front panel, the “Standby” LED indicator should be glowing
blue, indicating that AC power is available and the capacitor banks
are charged. The “Power” LED should not be on. If the “Power”
LED is on, don’t get excited, just use the front panel stand-by switch
to go to 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 yet. You can go ahead
and connect the source and speakers. Make sure you are in standby
mode to protect your speakers from transients. The prudent installer
will unplug the XA60’s power cord from the mains while attaching
speaker cables.
To avoid the possibility of short circuits always connect speaker
cables to the speakers prior to connecting to the amplifier. The
output binding posts will accept either bare wire or spades.
(Regulatory agencies in many countries have banned binding posts
that will accept a banana plug, forcing us to abandon this option.)
Make sure that your speaker wires only attach to the outputs of the
amplifier, not to each other and never to the amplifier case.
Some powered subwoofers require an audio signal ground reference
and their makers may suggest that a black speaker terminal is
where this voltage reference might be found. On complementary
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
factory for specific instructions.... you have been warned.
The amplifier may be driven single-end or balanced, your choice.
Single-ended input will always occur through the RCA connector
and balanced input will always occur through the XLR connector. If
driving the amplifier single-ended leave the supplied jumper in place
between pins 1 & 3 on the input XLR. On the XLR connectors pin
1 is ground, pin two is positive input and pin 3 is inverted (negative)
input. Pin numbers are marked on the XLR. If you re-install the
jumper incorrectly or leave it lying about, the amplifier will not work
properly. You must choose either XLR or RCA inputs it is not
advised to try and run both concurrently.