Acoustic Image Flex Cab Manuel du propriétaire - Page 8

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you will hear the effect in a boomy bass situation. Experiment with the

position of the control to give you the sound you like best.

The phase reverse switch is used to reduce feedback and to control

phase interactions between the two channels. If you are using two

pickups or a mic and a pickup, you will find the phase reverse switch to

come in handy. Phase related interactions between a mic and a

pickup or two pickups can be cleared up by reversing the phase of one

of the channels. Mic feedback can be reduced by reversing the phase

of the signal. You should experiment with the phase reverse switch to

see if the effect is one that you like.

If desired, the phase switch can be converted to a speaker emulation

filter by moving a jumper on the rear of the Flex Pre circuit board. How

this is done is described in the section entitled "Jumper Options." This

can be done on either or both channels.

The speaker emulation filter is a low pass filter that modifies the

preamp output to sound like a single speaker guitar amp. It rolls the

frequency off starting a 4 kHz. If you are a guitar player, you may find

this to be a desirable sound, it will allow you to get a more "classic" jazz

guitar sound.

Effects Loop

The Flex Pre has an output ("Send") and input ("Return") capability in

each channel to allow you to use effects boxes. The effects loop for

each channel is located on the rear panel of the unit. See page 10 for a

diagram of the rear panel. The send output is affected by the input

volume and tone controls and can also be used as a preamp output for

driving other power amplifiers. Because the effects loop is a parallel

type, plugging something into the send output does not interrupt the

signal path. So, a tuner can be plugged into the send output without

affecting the signal going through the amp.

The return input can also be used as an auxiliary input for connecting

other line level signals such as a CD player.

Direct Out

An XLR jack is provided for a Direct Out connection that allows the

preamp output to be fed to mixing boards of house PA systems or

recording studios. As a result, the instrument(s) connected to the unit

can be recorded or further amplified by the house PA system. The

direct out jack is located on the front panel of the Flex Pre. The Direct

Out signal is the combined output of the two channels.

A switch is provided to allow you to select whether the output from the

Direct Out jack is affected by the tone controls (post EQ) or not (pre

EQ).

With the switch in either the pre or post EQ position, the input level

control affects the level of the Direct Out signal, the master level does

not. This allows independent adjustment of the "stage" volume (the

volume coming from the connected speaker system) and the "house"

volume (the volume in the house PA system) when the unit is used with

a stage monitor. Once the level has been set for the house, if more

volume is needed on stage, the master level can be increased. This

will increase the stage volume but not the volume in the house PA.

A ground lift switch is available to "lift" the ground from the output of the

direct out--reducing noise should a ground loop create hum when the

unit is connected to a mixing board.

If the direct out signal is overdriving the mixing board, switch in the 10

dB pad to reduce the signal output level.

Mute Switch

A switch is provided to allow you to mute the output of the Flex Pre

without having to turn the amp off. This will allow you to tune your

instrument on stage without being heard. The amp output and direct

out signals are both muted by the switch. The mute switch is on the

front panel and when it is on, the switch is illuminated.

getting any sound out of the amp, check to make sure that the

mute switch is off.

Preamp Output

The Flex Pre is connected to the Flex Cab via the RJ-45 jack. There

are 1/4 inch jacks labeled "Preamp Out" on the rear panel for

connecting the unit to other powered cabinets. When the Flex Pre is in

mono mode, the top jack, labeled "Ch 1" or "Mono" is the output to use.

Stereo Operation

An internal jumper option is available to allow the Flex Pre to operate

in true stereo mode. The output of channel 2 can by disconnected

from the jack labeled "mono" on the rear panel and connected to the

channel 2 output jack by changing the position of a jumper on the

backside of the preamp control board (see the "Jumper Options"

section for details). When in true stereo mode, the output of each

channel is independently available from each preamp output jack.

Note that when in the stereo mode, channel 2 is no longer connected

to the Rj45 output, so it will not be heard through a Flex Cab connected

to the Flex Pre.

Effects

The Flex Pre has a high-quality, 24 bit digital effects processor. Three

variable effects are available: a reverb with variable decay time, a

reverb/delay with variable delay, and a delay with variable delay time.

A four position switch selects the program (Off, Reverb, Delay/Reverb

If you are not