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and Delay). There are illuminated switches to select which of the two

channels is processed by the effects unit. Either channel can be

connected to the effects unit. If both switches are engaged,

theselected program appears in both channels. A level control affects

the amount of effect that is heard in the signal (the "wet/dry" mix) and

another control affects the rate of the effect (reverb decay time or

delay time). For example, the rate control has enough range that the

Reverb program can be varied from a large hall to a small room. You

should experiment with both the program selection and the level and

rate controls to find the sound that you prefer. When effects are not

used (program switch in the off postion), the switches for both

channels should be off and the level control should be turned fully

counterclockwise.

Pseudo Stereo Operation

The effects processor in the Clarus preamp is a stereo unit. As a result,

a single input can be converted to a stereo output as far as the effects

are concerned. The 1/4 inch jacks labeled "Stereo Out" on the rear

panel are where the pseudo stereo signals are accessed. To operate

in pseudo stereo mode, plug an instrument into channel 2 (

channel 2 has this feature, connecting to channel 1 won't work in

this mode

) and connect a separate powered speaker (such as the

Flex Cab) or power amp and speaker combination to each of the

"Stereo Out" jacks located on rear panel. The effects level control

affects the wet/dry mix and the input level control affects the overall

level of the signal. The master level control has no effect. You should

experiment with the operation of the pseudo stereo mode to find the

sound you like best.

Headphone Output

There is headphone output on the rear panel of the Flex Pre. You can

plug a standard 1/8 inch stereo plug into this output to connect a

headphone for private listening. If your headphone has a 1/4 inch

plug, you can buy an adapter to allow you to use the 1/8 inch output

jack.

When you plug into the jack, the preamp output is muted. Sound will

only be heard through the headphones. The headphone is connected

to the output of the preamp so all of the controls on the preamp,

including effects, will be heard through the headphone. When the

headphone plug is removed from the jack, the amp will come back on.

Anytime anything is plugged into the headphone output jack, the amp

will be muted so make sure that nothing is plugged into the jack when

you want to use the amp normally.

The headphone output is to be used only for connecting a

headphone unit, do not use it as line out or to drive a low

impedance speaker.

Limiter Switch

Under extreme playing conditions such as high volume or when

driving a low impedance speaker load, the amplifier and speaker

system connected to the Flex Pre may be pushed beyond their limits.

When that happens, you will hear high distortion and, if connected to

the Flex Cab, 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 Flex Pre, is provided to allow the amp

to operate under these conditions with lower distortion or without

having the 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.

External Power Option

If the Flex Pre is to be used in an application without the Flex Cab, the

supplied power supply can be used. Simply plug the supply into the AC

only

outlet and then plug the output of the supply into the power jack on the

rear panel. The external power supply operates from 100V to 240V

AC, so the Flex Pre can be used in standalone mode anywhere in the

world. The appropriate adapters for the ac plug are included.

Use only the external power supply provided by Acoustic Image,

otherwise, the Flex Pre may not operate properly.

Internal Jumper Options

On the back side of the Flex Pre 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 6 allen-head screws on the preamp front panel and

lift the preamp module out of the chassis.

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

Ch 2 Jumper

Gain Jumpers

Filter Jumpers