Acoustic Image Flex Pre Panduan Pemilik - Halaman 6

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Flex Pre

Introduction

The Flex Pre is a two-channel preamp designed to work in conjunction
with the Flex Cab (or other powered cabinets) to implement a versatile
musical instrument amplification system. Or, it can operate as stand
alone preamp/direct box for performing or recording situations. It is a
high performance unit that combines two channels with four band EQ,
sophisticated filtering and digital effects into a compact unit. A signal
flow diagram is shown on page 9 along with illustrations of the front
and rear panels. Refer to these as needed when reading the following
description.
Note that all of the push button switches illuminate when they are in
the "on" position. So, a quick glance at the preamp will tell you which
functions have been engaged.
Note that when the Flex Pre is used with the Flex Cab, there is a 5
to 10 second delay after the power has been turned before the
amp becomes operational. This is done so that "start up" noises
are not heard.
Also note that there are a few internal jumper options that can be
accessed when the front panel is removed. These options are
intended for the advanced user. They are available to add additional
functionality and are referenced in the description below. The jumper
locations are shown on page 13 and are noted on the signal flow
diagram.
Preamp

Inputs

Separate 1/4 inch and XLR jacks are used for the inputs to each
channel of their preamp. The 1/4 inch input has a 1 megohm input
impedance that is optimized to get the best sound from piezo pickups.
The XLR input is a low impedance balanced input with sufficient gain
to allow microphones to be plugged into it. There is a switchable 10 dB
gain to accomodate mics that need more gain. Phantom power is
available through the connector for powering a mic or outboard
preamp and can be activated using the push button switch located
next to the connector.
To avoid an audible "pop", set the input level
control all the way off when switching on the phantom power.
input jacks are separately buffered so both can be used at the same
time. Each channel is identical and can be blended to mix two
instruments, 2 microphones or a mic and an instrument thereby
performing much like a small PA system.

Controls

The Flex Pre has the following controls in each channel: input level,
Low, Lo Mid, Hi Mid and High tone controls. In addition, there is a
variable frequency low cut filter and a phase reverse switch in each
channel and a master level control that affects both channels.
8

Signal Flow Diagram

The
Input
Level
Ch 1
-6 dB
gain
jumper
+10 dB
Phantom
Power
Note: all switches are illuminated
Power Supply
when in the on position
48 +V -V
Input
Level
Ch 2
-6 dB
gain
jumper
+10 dB
Phantom
Power
10dB
10dB
Front Panel
9
Tone
Controls
Low Cut
Freq
High
Low
Lo Mid
Hi Mid
I/O Boar
Ch1 Pre Out
From
18V
Ch1 Effects
Ext
Loop
Supply
Simulated
From
Stereo Output
Flex
Cab
Headphone
Ch2 Pre Out
Ch2 Effects
Loop
Tone
Controls
Low Cut
Freq
Hi Mid
High
Low
Lo Mid
1
2
Off
3
1 Reverb
2 Del/Rev
3 Delay