Australian Monitor AV2.4P - Manual (Page 9)

O P E R AT I O N
PA G E 9 AV 2 . 2 P / AV 2 . 4 P – O P E R AT I O N M A N U A L
IMPORTANT: All signal source equipment should be adequately
earthed. This not only ensures your safety but everybody else’s as
well. Faults can and do occur in mains connected equipment where
the chassis can become “live” if it is not properly earthed. In these
instances, the fault in a “fl oating” (ungrounded) piece of equipment
will look for the shortest path to ground, which could possibly be your
amplifi er’s input. If the fault current is large enough, it will destroy the
input to your amplifi er and look for the next available path, which may
be you!
Before making any connections to your AMAV amplifi er, observe the following:
Ensure the mains voltage supply matches the label on the rear panel of your
amplifi er (+/- 10%).
Ensure that the power switch is OFF.
Ensure that all system grounds (earth) are connected from a common point.
Avoid powering equipment within a system from multiple power sources that
may be separated by large distances.
Check the continuity of all interconnecting leads to your amplifi er; ensure that
there are no open or short circuited conductors.
Ensure that the power handling of your load (speakers) can adequately cope
with the power output of the amplifi er.
Before operating your AMAV amplifi er, ensure that:
- The attenuators are at the “OFF” position (fully anticlockwise).
- The GROUND LIFT Switch is not engaged (should be in the
“out” position).
- The BRIDGE Switch is not engaged if you are not running the
amp in bridged mode.
Powering Up
REMEMBER: The amplifi er should be the last piece of equipment that
you turn on and the fi rst piece of equipment that you turn off.
We recommend turning the attenuators on your amplifi er down when turning
the unit on.
Level Matching
The normal operating position for the attenuator is the max position (fully
clockwise, no attenuation). In this position the amplifi er operates at full gain.
Turning the attenuator back (anticlockwise) reduces the input sensitivity.
NOTE: If full power output is required, you should operate your
amplifi er with the front panel attenuator above the half way
(12o’clock) position, otherwise clipping of the input circuitry and its
resultant distortion will occur before full output power is achieved.
Sensitivity
Your amplifi er is a linear device operating with a fi xed input to output voltage
gain (less attenuation). The maximum output voltage swing is determined by
the applied mains voltage, load, load type and the duty cycle of the applied
signal.
The input sensitivity for your AMAV Series amplifi er when the attenuator is at
maximum position (fully clockwise) is nominally:
+4.0dBu (1.23 volts in) for rated power into a 8 ohm load
+2.2dBu (1.0 volts in) for rated power into a 4 ohm load.
Each channel of your AMAV amplifi er has a nominal balanced input
impedance of 20kOhms (@1kHz) and should not present a diffi cult load for
any signal source.
Your signal source (i.e. the equipment feeding signal to the amplifi er) should
have an output impedance of 600 Ohms or lower to avoid unwanted high
frequency loss in the cabling.
Input overload occurs at +19.1dBu (7.0 volts)