Advertisement
Setup
The amplifier has three sets of connections and one switch:
The first connection and switch is the AC line power system. The amplifier's voltage and
current rating are indicated on the bottom. It will be either 240 volts, 120 volts, or 100 volts.
100 and 120 volt units are equipped with a 15 amp 3AG type fuse. 240 volt units have a 10
amp 3AG fuse. The frequency rating of the AC line source is 50 to 60 Hz.
Your amplifier is provided with a standard AC power cord which fits into the line receptacle
located just below the power switch. The amplifier is equipped for operation with an earth
ground provided by the AC outlet. Do not defeat this ground. The chassis of the amplifier is
connected directly to this earth ground, and the audio circuit ground is connected to the
chassis and earth through a power thermistor, which gives a ground connection but helps
avoid ground loops.
While the amplifier is equipped with an AC inrush suppresser, the turn-on AC draw will peak
(half cycle) at roughly 50 amps.
The second connection is at the input. If your signal source is balanced, you may use the
XLR input connector. On this connector, pin 1 is grounded, pin 2 is the positive signal input,
and pin 3 is the negative signal input. The amplifier is shipped with a shorting plug between
pins 1 and 3, which is used for unbalanced operation. If you will be using the RCA
unbalanced input, leave this plug in.
If you will be using the balanced input, remove this plug, but save it. Operating the amplifier
in unbalanced mode without this plug will not cause damage, but will not give the full voltage
gain of the amplifier.
If your signal source is unbalanced, input will occur through the RCA input connector, which is
in parallel with the XLR connections 1 and 2.
The unbalanced input impedance of the amplifier is a nominal 10 Kohm. In balanced mode,
the input impedance is higher, with a differential impedance of 25 Kohm.
The third connection is the amplifier output connection. Two sets of 5-way connectors are
provided in parallel for use in bi-wiring your loudspeakers if desired. The RED connector is
hot (+) and the black is cold (-). Connect the 5-way output connectors to loudspeaker plus
and minus, using the cable of your choice.
Do not drive the amplifier into a direct short. If distortion or fuse blowing accompany an
attempt to operate the amplifier, please disconnect the loudspeaker first and check for a
shorted circuit. As the amplifier does not use a current limiting protection circuit, quite a large
amount of power can flow from the amplifier. The design has been tested to survive external
short circuits, but the possibility exists for failure under these conditions. Such failure is
covered by your warranty.
Advertisement
