Remote Level Control (Optional): For one
A600.1D and one RLC, plug one end of
the RJ11 cord into the RLC and the other
One RLC can control more than one
A600.1D amplier using a phone jack
splitter like the one shown below. Plug one
connector into the RLC and plug each of
the other two into the RJ11 connectors on
If you need to control several ampliers
with a single level control and you would
prefer not to use a bunch of splitters, you
can cut and splice the wires carefully. Be
sure to match the colors or pin positions
carefully. The color code and pin-out is
If you have more than two A600.1D
ampliers and you want to use one RLC,
you’ll need additional splitters. Connect
as many as you need in the conguration
2: Black (White/Orange Stripe)
3: Red (Blue/White Stripe)
4: Green (White/Blue Stripe)
5: Yellow (Orange/White Stripe)
More about the RLC: No audio signal is
passed through the RJ11 cable. The RLC
contains a potentiometer that controls the
gain of a voltage-controlled amplier in
the A600.1D’s preamplier circuit. Split-
ting the signal between several ampliers
doesn’t degrade the signal or reduce the
If you’d like to make a custom control with
a different potentiometer style or a differ-
ent knob, you can do so easily.
You’ll need an RJ11 phone cord from
which you can cut one of the plugs so you
can solder the wires to the potentiometer.
You’ll also need a dual-gang 20kΩ log ta-
per potentiometer. There are many styles
from which you can choose. An example
Connect the phone cord’s black, red,
green and yellow wires to the potentiom-
eter according to the diagram below. Pins
2, 3, 5 and 6 must be connected together
and to the black and green wires. Pin 1
must be connected to the yellow wire and
pin 4 must be connected to the red wire.
You can connect several ampliers to one
potentiometer in this manner.
