AUSTRALIAN MONITOR AM2200NG Instrukcja instalacji i obsługi - Strona 9

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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 AMNG Series 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 AMNG Series 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.

When you power up your AMNG Series, your ampliﬁ er goes through an

initialising period before it will accept signal. The Inrush Current Suppression

(ICS) circuit is in operation for the ﬁ rst 0.2 seconds. This limits the mains

current, to prevent "nuisance-tripping" of circuit breakers.

During this period you will hear a couple of relays "click", indicating mains is

now directly applied to the ampliﬁ er and the signal path is connected.

While the ICS circuit operates there is also a 30dB mute on the signal input.

After two seconds this mute will release, allowing any applied signal to pass

un-attenuated.

When switching the ampliﬁ er off, wait a couple of seconds before switching the

ampliﬁ er on again. This allows the ICS circuit to reset.

AM2200NG & AM2600NG INSTALLATION AND OPERATION MANUAL

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 AMNG Series ampliﬁ er when the attenuator is at

maximum position (fully clockwise) is nominally:

0dBu (0.775 volts in) for rated power into a 4 ohm load.

Each channel of your AMNG Series 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 +20.5dBu(8.25volts).

OPERATION

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