Acoustic Image Clarus Manuale d'uso - Pagina 7

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Effects

On/Off

Phase Inv

nel

Effects

Prog Select

Rate

Level

Phase Inv

Ch 2

Effects

jumper

On/Off

10dB

10 db

Direct Out

Pre/Post

Pad

I/O Buss

Gnd Lift

Master

Level

Power

Amp

Mute

Off

1 Reverb

2 Del/Rev

3 Delay

Control Panel

Limiter Switch

Under extreme playing conditions such as high volume or when

driving a low impedance speaker load, the Clarus may be pushed

beyond its limits. When that happens, you will hear high distortion and

you may even cause the overcurrent protection circuit to operate

resulting in an interruption of sound. The limiter switch, located on the

rear panel of the amp head, is provided to allow the amp to operate

Speaker

under these conditions with lower distortion or without having the

Outputs

overcurrent circuit kick in. The limiter reduces the peak signal that is

driving the power amp, thereby reducing its peak output with the result

of lower distortion. If you find yourself having to play in extreme

conditions that cause the amp to have too much distortion or even

signal interruption, engage the limiter and see if that helps the

situation.

Internal Jumper Options

On the back side of the Clarus preamp control circuit board are

several user-selectable options: one selects the gain level in the input

stage, another selects between a phase reversal and a speaker

emulation filter and the last disconnects channel 2 from the output

buss and connects it to an output jack. To access the back side of the

circuit board, remove the 5 screws that hold the front panel to the

chassis and remove the panel and preamp from the chassis .

A photo of the back side of the circuit board is shown below:

Ch 2 Jumper

Looking closely at the circuit board in the vicinity of the jumpers, you

can see that each has a label that tells you the option that has been

selected by the jumper. The Gain Jumper is labeled "Norm" or "-6 dB."

If the shunt is under "Norm," the normal gain option is selected. The

Filter Jumper is labeled "Invert" or "LP." If the shunt is under "LP," the

low pass filter, or speaker emulator has been selected. As you can

see, each channel has a jumper option, so you can select the same or

a different option for each one. The Ch 2 Jumper is labeled "Out" or

"In." If the "In" position is selected, channel 2 is disconnected from the

output buss and is connected to the Ch 2 Preamp Out jack on the rear

panel. (Hopefully that nomenclature is not too confusing.)

Gain Jumpers

Filter Jumpers