Specifications

Before making any connections to your IS Series amplifier, observe the

following:

Ensure the mains voltage supply matches the label on the rear panel of

your amplifier (+/- 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 amplifier; 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 amplifier.

Before operating your IS Series amplifier, ensure that:

- The attenuators are at the “OFF” position (fully anticlockwise).

- The GROUND LIFT Switch is not engaged (should be in the “Ground”

position).

Powering Up

REMEMBER

The amplifier should be the last piece of equipment that you turn on and the

first piece of equipment that you turn off.

We recommend turning the attenuators on your amplifier down when turning

the unit on. When you power up your IS Series, your amplifier goes through an

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

(ICS) circuit is in operation for the first 0.5 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

amplifier 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 amplifier off, wait a couple of seconds before switching the amplifier on

again. This allows the ICS circuit to reset.

Level Matching

The normal operating position for the attenuator is the maximum position

(fully clockwise, no attenuation). In this position the amplifier operates at full

gain. Turning the attenuator down (anticlockwise) reduces the input

sensitivity.

NOTE:

If full power output is required, you should operate your amplifier 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.