Acoustic Image + Models - Manual (Page 2)

Welcome
The Basics 1
Operation 2
Power 2
Preamp 2
Inputs 2
Controls 3
3
Control Panel Drawings 5
Signal Flow Diagram 5
Stereo Operation 7
7
Headphone Output 7
Docking System 8
Connecting An Ext Speaker 8
Internal Speaker Defeat
Switch 9
Speaker Placement 9
Tilt Mechanism 9
Description of the Corus+ Combo 10
Care 10
Warranty And Repair 10
Specifications 11
Notch/Low Cut Filter/Phase
Reverse
Effects Loop 4
Direct Out 4
Mute Switch 7
Effects
Contents
The information in this manual is subject to change without notice. No part of this manual may be
reproduced by mechanical, electronic or other means in any form without prior written permission from
Acoustic Image.
The Acoustic Image logo is a registered trademark of Acoustic Image LLC. Contra, Coda+, Corus+,
Contra EX , Corus EX and Cabrio Docking System are trademarks of Acoustic Image LLC. 1
Welcome to Acoustic Image!
You have purchased a state-of-the-art musical instrument amplifier system,
combining purity, power and portability in a package that sets a new standard in
high fidelity amplification.
Each of our designs is engineered to accurately reproduce the sound of acoustic
and electric instruments, delivering flat frequency response across the entire
musical spectrum; extended, tight, well-controlled bass; and complete clarity of
sound reproduction.
This manual provides operating information for your Acoustic Image Contra, Coda+
and Corus+ combo amps and the Contra EX and Corus EX extension speaker
cabinets.
The Basics
Our combo amps all have a superb class-D power amplifier with switch mode power
supply, a compact two-way speaker system and a sophisticated, sensitive
preamplifier. The features of the preamp and the speaker configuration define the
specific combo model. Two of the combos have the exclusive Cabrio Docking
System that allow the head unit to be removed and used as a stand-alone amplifier.
The power amp is a high efficiency design that requires no external heat sinks or
cooling fans and is capable of driving loads as low as 2 ohms. Two output power
levels are used, 400W and 800W. AC power and output speaker jacks are located
on the rear of the enclosure. A standard, three-prong detachable AC power cord is
used to provide power to the unit, while AC voltage selection switch allows the unit to
operate at 115V/60 Hz or 230V/50 Hz. Japan models operate at 100V, 50/60 Hz
only. See the rear panel of your amp to verify the AC voltage capability.
The Contra combo is equipped with a 400W power amp and a one-channel preamp;
the Coda+ and Corus+ have an 800W power amp, a second, identical channel and a
six-program effects unit and the docking system. The Corus+ combo
uses a
different speaker system that gives it a somewhat different sound from the other
combos. The input channels of both preamp types incorporate combo jack
interfaces that allow either a high impedance instrument input (to optimize the sound
of piezo-type pickups) or a mic input (the Coda+ and Corus+ mic inputs have a
switchable 10 dB pad),
an effects loop with return level control, a
selectable notch/low cut filter (Contra) or low cut and phase reverse switch (Coda+,
Corus+) for feedback control and reduction of low frequency boominess, a direct out
capability with ground lift and pre/post EQ switch, a master level control and a mute
switch. The two-channel preamp of the Coda+ and Corus+ has a switch that allows
the second channel to be disconnected from the main amp and connected to a
satellite power amp to create a stereo system.
The speaker enclosures in these combos incorporate a 10-inch downfiring woofer,
and a 5-inch frontfiring midrange with extended frequency response. The Corus+
and Corus EX use a different woofer that gives it a sound that is better for
instruments like guitar. A built-in, spring-loaded tilt mechanism allows the cabinet to
be tilted back to better direct sound to your listening position. The cabinet is made of
an acoustically inert, high durability, injection molded polymer material which
dramatically reduces the weight of the cabinet. Each unit comes with a fitted slip
cover and shoulder strap. A padded case is also available.
a three-band EQ,
While our combos and speakers are designed to play loudly--and clearly--enough
so that you can be heard in most gigging situations, they are not suited to playing at
extreme volumes. Generating high SPLs may require an extension cabinet like the
Contra EX or Corus EX or augmentation by a larger house system.