8
Connecting & Adjusting your JC 3 Jr.
Always disconnect the AC cords to your JC 3 Jr. and integrated amplifiers or power
amplifier before making or changing the input, output or trigger wire connections.
Inserting or removing an audio input or output interconnect while the JC 3 Jr., integrated or
power amplifier is turned on can result in a blast of sound that can damage your
loudspeakers. Make sure there is no strain or tension on any cables that could cause them
to pull loose while these are turned on.
Audio Input Connection & Settings
Connect your turntable’s signal cables to the Input jacks on the JC 3 Jr. It is a good idea to
treat the turntable cable’s RCA plugs with Deoxit (http://www.deoxit.com/) to remove any
oxidation on them. The turntable’s ground wire attaches to the JC 3 Jr. Ground terminal that
is located next to the right channel XLR balanced output.
Note:
In some cases eliminating hum might require connecting your turntable ground wire
directly to your line stage preamp instead of to the JC 3 Jr. You can use a chassis screw or
the outer ring of an RCA connector on your line stage. In rare instances hum might be lowest
if your turntable ground wire is not attached at all.
Important Note
: Turntables and phono preamps are very sensitive to electromagnetic fields
that can cause audible hum. To minimize hum follow these guidelines:
Place your turntable as far as possible from amplifiers and AC power line conditioners.
Run your turntable signal cables as far as possible from power amplifiers and AC
power line conditioners.
Do not run the turntable signal cables parallel with any AC cords.
Wherever turntable signal cords must cross AC wires they should cross at a 90
o
right angle.
It might be necessary for you to experiment with the exact positioning of the turntable
signal cables to minimize hum.
