Acoustic Image + Models - Manual (Page 3)

1
Welcome to Acoustic Image!
You have purchased a state-of-the-art musical instrument amplifier, 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 Clarus 1
and Clarus+ integrated amplifiers.
The Basics
All Acoustic Image integrated amplifiers are based on the same superb class-D
power amp that delivers 400-watts into 4 ohms (Clarus 1) or 800-watts into 4
ohms (Clarus+) and on a sophisticated, sensitive preamplifier. The features of
the preamp and the power amp rating define the specific amplifier model.
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. AC power and
output speaker jacks are located on the rear of the chassis. A standard, three-
prong detachable AC power cord is used to provide power to the unit, while an
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 Clarus 1 is equipped with a one-channel preamp, the Clarus+ adds a
second, identical channel and a six-program effects unit. 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 Clarus+ mic inputs have a switchable 10 dB pad),
an effects loop with return level control, a selectable notch/low cut filter
(Clarus 1) or low cut filter and phase reverse switch (Clarus+) for reduction of
feedback and 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 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 Clarus+ is compatible with our Cabrio Docking System used in some of our
combo amps. If you have the appropriate speaker cabinet, you can dock it in
the cabinet.
Yours is a high fidelity amplifier with full-range frequency response and low
distortion and noise that will accurately amplify your sound. Onboard EQ is
sufficient to overcome room acoustics and subtly shape the sound of your
instrument. However, you should note that our amps are not designed to play at
tonal extremes or to allow an overdriven distorted output. To achieve these,
use an external effects box.
a three-band
EQ,
2
Power
Preamp
Plug the detachable AC power cord into the receptacle on the back of the amp
and into a wall receptacle. A power switch next to the AC connector turns on
power to the pre- and power amps, illuminating a “power on” indicator on the
front panel of the amp. A 6.3-amp fast blow fuse(Clarus 1) or 8-amp fast blow
fuse (Clarus+) is mounted on the back panel. To replace the fuse, turn off the
amp, remove the AC cord and use a small screwdriver to remove the fuse from
the fuse holder. A spare fuse is included with this manual.
AIl amps will work with either 115 volt, 60 Hz AC or 230 volt, 50 Hz AC power. A
switch located on the rear panel selects the appropriate voltage. Note that the
correct AC power cord must be used for connection to the appropriate wall
plug. If you do not have the right cord, you can buy one from an electronics or
computer store. Be sure the switch is in the correct position for the intended
application.
Please note that units sold in Japan operate at 100 volts only. The above
mentioned voltage switch is not available for these units.
These amps use combo jacks for the input to each channel of their preamp.
Either an XLR or 1/4 inch connector can be plugged into this type of jack. 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. A switchable 10
dB pad is provided in the Clarus+ to attenuate the output of microphones that
are too “hot” for the mic input. Phantom power is available through the
connector for powering a mic or outboard preamp and
using
Operation at 230 volts with the switch in the 115 volt position
will damage the unit.
Operation of a 100
volt amp at any other voltage than 100 volts will damage the unit.
Inputs
Refer to the signal flow diagram and the control panel drawings (page 4).
can be activated
Operation
Clarus 1 Rear Panel
CAUTION: TO REDUCE THE
RISK OF ELECTRIC SHOCK,
DO NOT REMOVE COVER.
NO USER SERVICEABLE PARTS
INSIDE. REFER SERVICING
TO QUALIFIED PERSONNEL.
CAUTION: TO REDUCE THE
RISK OF FIRE, REPLACE FUSE
WITH THE SAME TYPE 6.3A FAST
BLOW FUSE (F 6.3A H 250V)
Fuse Power Switch Voltage Switch
115/230V
AC Input
115/230 V
50/60 Hz
400 Watts
~
Speaker Output 2 min W
1 15V
CAUTION: TO REDUCE THE
RISK OF ELECTRIC SHOCK,
DO NOT REMOVE COVER.
NO USER SERVICEABLE PARTS
INSIDE. REFER SERVICING
TO QUALIFIED PERSONNEL.
CAUTION: TO REDUCE THE
RISK OF FIRE, REPLACE FUSE
WITH THE SAME TYPE 8A FAST
BLOW FUSE (F 8A H 250V)
Fuse
Power
Switch
Voltage Switch
115/230V
AC Input
115/230 V
50/60 Hz
900 Watts
~
Speaker Output 2 min W
Headphone
Output
1 15V
S/N 5F 0001H
Clarus+ Rear Panel