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Balanced XLR input operation
The balanced mode can only be used if the source has a balanced output. In order to
use the balanced XLR input, connect the XLR plugs from the source to the input XLR
socket.
Connecting to the power amplifier:
Single-ended (normal) output and operation
Use the + RCA on right and left channel for connection to the power amplifier.
Balanced XLR output and operation
The balanced mode can only be used if the power amplifier has a balanced input.
Use an XLR interconnect with GND on pin 1, + on pin 2 and - on pin 3.
Balanced RCA output and operation
The balanced mode can only be used if the power amplifier has a balanced input. Be
sure the power amplifier is turned off. Use 2 single (1 stereo) interconnect cables from
the preamplifier to the power amplifier, connecting + and - outputs from the preamplifier
to the
+ and - inputs of the corresponding channel on the power amplifier.
Make sure the + and - are not interchanged, as this will cause the system to operate
out of phase, with very poor bass response as a result.
NEVER use shorting plugs on any output terminal i.e. Rec. out or main out.
How to avoid noise problems
The EC 4 R preamplifier contains circuitry that may be sensitive to magnetic fields. The
unit should be placed well away from transformers etc. Care should also be taken in
routing all signal cables. Do not run signal cables in parallel with speaker or AC cables (
mains).
Keep cables as short as possible.
If the unit is placed on top of a power amplifier, leave at least 4" ( 10cm) of space
between the two units.
Switches and controls
The power on/off switch is located in center of the face plate. This unit is equipped with
separate record and listen switches. It is possible to listen( for instance) to a CD while
recording another source - for instance a tuner. The two rotary switches are located on
the left half of the faceplate.The right half of the faceplate contains the volume and
balance controls.
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