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INT-150 Owners Manual
For maximum safety we suggest that the power cord should be the last
cable installed on your power-amplifier.
You may, if you wish, substitute a 15-amp aftermarket power cord for the
one we have supplied. Only use polarized power cords, which meet all
local safety standards and carry acceptance marks from the local regulatory
authority. The power cord should be attached to the amplifier prior to
plugging into house power. Always place the rear-mounted switch in the
off (down) position before plugging in this amplifier.
The amplifier’s voltage and current rating are indicated on the rear panel.
It will be indicated as either 100 volts, 120 volts, 220 volts, 230 volts or
240 volts. The smaller Pass Laboratories power amplifiers, preamps
and integrated amplifiers use a slow-blow 3AG (equivalent to 313 in EC
markets) type fuse. The required value of the fuse will be indicated on
the amplifier. The frequency rating of the AC line source is 50 to 60
Hz. Please verify that the amplifiers indicated voltage requirements are
consistent with the supplied voltage and current at your location.
On the rear panel you will find both RCA and XLR type input connections
for single-ended or balanced inputs. If you use the RCA input, be certain
that the XLR connector has a gold shorting plug between pins 1 and 3,
which connects the “minus” input to ground, otherwise the amplifier will
not operate properly. If you lose this shorting plug, just contact the factory
– we give them away all the time.
The question comes up all the time – are balanced inputs (XLR) better
than single-ended (RCA)? The answer is that balanced lines generally give
lower noise and slightly less distortion. They are recommended unless your
favorite source component has only RCA outputs.
Also on the rear panel are the output connections for the loudspeakers. On
stereo amplifiers there is one pair per channel, and on mono amplifiers we
provide two pairs wired in parallel to facilitate “bi-wiring” a loudspeaker.
As you are probably familiar, the red one is positive polarity, and the black
one is negative.
Please note that, being a balanced output device, both of these terminals
are electrically live – neither is grounded and neither should not be treated
as ground. This is particularly important if you are using the output of
the amp to also drive a subwoofer amplifier or other active component. If
there is any question, please contact the manufacturers of the products
involved – both they and we will be happy to advise you.
If you happen to need a clean signal ground connection for any reason,
we provide a dedicated 5 way binding post just for that on the rear of the
amplifier.