Acoustic Image Ten2 EX User manual

Ten2
Clarus
Coda
Corus
Version S4plus R1
PAYATTENTION TO THESE SYMBOLS:
IMPORTANT SAFETY INSTRUCTIONS
1) Read these instructions.
2) Keep these instructions.
3) Heed all warnings.
4) Follow all instructions.
5) Do not use this apparatus near water, do not expose to dripping or splashing
water, do not place objects filled with liquid on apparatus.
6) WARNING: to reduce the risk of fire or electric shock, do not expose this
apparatus to rain or moisture.
7) Clean only with a dry cloth.
8) Do not block any ventilation openings. Install in accordance with
manufacturer’s instructions.
9) Do not install near any heat sources such as radiators, heat registers, stoves
or other apparatus (including amplifiers) that produce heat.
10) This apparatus shall be connected to a mains outlet socket with a positive
grounding connection. Do not defeat the safety purpose of the polarized or
grounding-type plug. A polarized plug has two blades with one wider than the
other. A grounding type plug has two blades and a third grounding prong. The
wide blade or the third prong are provided for your safety. If the provided plug
does not fit into your outlet, consult an electrician for replacement of the
obsolete outlet.
11) Protect the power cord from being walked on pinched particularly at plugs,
convenience receptacles, and the point where they exit from the apparatus.
12) Use only attachments/accessories specified by the manufacturer.
13) Use only with the cart, stand, tripod, bracket, or table specified by the
manufacturer, or sold with the apparatus.
14) Unplug this apparatus during lightning storms or when unused for long
periods of time.
15) Refer all servicing to qualified service personnel. Servicing is required
when the apparatus has been damaged in any way, such as power-supply cord
or plug is damaged, liquid has been spilled or objects have fallen into the
apparatus, the apparatus has been exposed to rain or moisture, does not
operate normally or has been dropped.
The exclamation point triangle is used to alert the user to important operating or
maintenance instructions. The lightning bolt triangle is used to alert the user to the
risk of electric shock.
To prevent electric shock, do not remove the top cover.
No user serviceable parts inside. Refer servicing to
qualified service personnel.
To completely disconnect this equipment from the AC
mains, disconnect the power supply cord from the AC
receptacle.

Welcome
The Basics 1
Operation--Amp Head 3
Power 3
Preamp 3
Inputs 4
Controls 4
5
Stereo Operation 7
8
Pseudo Stereo Operation 8
Headphone Output 8
Limiter Switch 11
Internal Jumper Options 11
Power Amp 12
Connecting a Speaker 12
Operation with No Speaker 12
Operation--Speaker Cabinets 13
Docking System 13
Speaker Placement 13
Tilt Mechanism 13
Connecting an Extension Speaker 14
Presence Switch 14
Description of the Corus Combo 14
Tweeter Level Control 15
Room Coupling Control 15
Description of the Ten2 EX 15
Care 19
Warranty And Repair 19
Low Cut Filter/Phase Reverse
Effects Loop 6
Direct Out 6
Mute Switch 7
Preamp Output 7
Effects
Control Panel Drawing 9
Signal Flow Diagram 9
Specifications 16
Shoulder Strap 18
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 ofAcoustic Image LLC. Coda, Corus, Coda EX , Corus
EX, Ten 2, Ten2 EX, Clarus 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
Series 4plus Clarus head, Coda, Corus and Ten2 combo; and Coda
EX, Corus EX and Ten2 EX extension cabinet.
The Basics
Our Series 4plus product line consists of a two channel amp head and
three speaker cabinets. The head mounts in the cabinets using our
exclusive Cabrio Docking System to form three different combo amps.
The Clarus amp head uses a class-D power amplifier with a switch
mode power supply and a sophisticated, sensitive two channel
preamplifier. The speaker cabinets have a 1x10 or 2x10 speaker
configuration. The features of the speaker configuration define the
specific combo model. The Coda combo has a 1x10 speaker
configuration with a poly cone woofer. The Corus combo has a 1x10
speaker configuration with a paper cone woofer. Both have a 5 inch
extended range driver with presence control in addition to the woofer.
The Ten2 combo uses a 2x10 speaker configuration (one downfiring,
one front firing) with poly cone woofers in conjunction with a 2.5 inch
tweeter. Each cabinet type is also available as an extension speaker
in either a “Cabrio-ready” configuration or as a fixed extension cabinet
(Coda EX, Corus EX or Ten2 EX).
The features of the S4plus Clarus amp head are:
-Extended frequency range, high fidelity sound
-Light weight (<4 lbs.), small size (10.2 x 8.2 x 3.5)
-Unique, slanted front chassis
-Capable of being mounted in our Coda, Corus or Ten2
speaker cabinets
-Separate XLR and 1/4 inch inputs per channel
-48V phantom power and 10 dB gain select for mic input
-Input level control per channel
-Four band EQ per channel
-Selectable phase reverse and sweepable low cut filter per
channel (phase reverse can be converted to low pass
speaker emulation filter with internal jumper option
-Effects loop per channel
-Selectable reverb and delay effects with level and rate
controls and pseudo stereo output
-Direct out with selectable 10 dB pad, pre/post switch and
ground lift

-Headphone output
-Switchable limiter
-Mute switch
-Mono or stereo ouput from the preamp section
-Selectable internal jumper options for gain and stereo
operation
-High fidelity, low noise operation: 110 dB SNR at direct
out
-Automatic voltage switching for universal AC mains
operaton
-650 Watt output at 4 ohms (music power)
-Dual speaker outputs with speakon connectors
-Comes with padded case and speakon to 1/4 inch adapter
The features of the S4plus combo amps are:
-Clarus amp docks in cabinet using our exclusive Cabrio
Docking System
-Sealed two-way speaker system
-Coda:
-Lightweight (22 lbs) structural foam cabinet
-10 inch poly cone woofer + 5 inch extended
range midrange with level switch
-Corus:
-Lightweight (22 lbs) structural foam cabinet
-10 inch paper cone woofer + 5 inch extended
range midrange with level switch
-Ten2
-Lightweight (34 lbs) structural foam cabinet
-Downfiring + forward firing poly cone 10 inch
drivers + 2.5 inch tweeter with level control
-Exclusive Room Coupling Control for DF woofer
-All combos come with a fitted slip cover
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 Coda EX, Corus EX,
Ten2 EX or augmentation by a larger house system.
The instructions that follow apply to all of the S4plus products due to
the many common elements in the different units. Where there are
specific differences that are unique to one or more units, those
differences are described. The Clarus amp head is described first
followed by the common elements of the combo amps (docking
system, tilt mechanism, cabinet placement, etc). The specifics of each
cabinet type are then described followed by detailed specifications of
all of the models.
2
Operation--Clarus Head
Clarus Rear Panel
Coda, Corus and Ten2 Rear Panel
(shown in the docked position)
3
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 theAC input
turns on power to the pre- and power amps, illuminating a “power on”
indicator on the front panel of the amp.
Note
that a spare fuse is mounted inside the drawer.
Our amps and combos all operate with AC voltages between 100V
and 240V, 50/60 Hz. An internal switch automatically selects the
correct mode of operation for that voltage range. No user action is
required to set the unit to operate with different AC voltages. 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.
Note that when the power switch is off and the power indicator is off,
power is not completely removed from the amp. To completely remove
power, disconnect the power cord. Always leave the power cord
accessible so that you can easily disconnect power from the unit.
A 6.3-amp fast blow fuse is
mounted in the drawer marked with the fuse symbol that is part
of the AC receptacle. To replace the fuse, turn off the amp,
remove the AC cord and use a small screwdriver to pry the
drawer out of the receptacle. Remove and replace the fuse.
Note that 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.
Refer to the signal flow and the control panel diagrams (page 9).
Power Switch Fuse
Speaker Output 2 min. Use Class 2 WiringW
AC Input
100-240 V
50/60 Hz
600 Watts
~
Auto Voltage Switch
H/P
Effects Loops
Ch 1
Ch 2
Preamp Out Stereo Out Limiter
Off On
Rtn Snd
CAUTION
Risk of Electric
Shock. Do Not
Open. Do Not
Expose to R ain
Or Moisture
L
R
Power Switch Fuse
Speaker Output 2 min. Use Class 2 WiringW
AC Input
100-240 V
50/60 Hz
600 Watts
~
Auto Voltage Switch
H/P
Effects Loops
Ch 1
Ch 2
Preamp Out Stereo Out Limiter
Off On
Rtn Snd
CAUTION
Risk of Electric
Shock. Do Not
Open. Do Not
Expose to R ain
Or Moisture
L
R
Speaker Input
8 300WWPresence

4
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.
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 11 and are noted on the signal flow
diagram.
Separate 1/4 inch and XLR jacks are used for the inputs to each
channel of the preamp. The 1/4 inch input has a 1 megohm input
impedance that is optimized to get the best sound from piezo pickups.
It will also work well with magnetic 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.
The 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.
The Clarus preamp 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.
The input level controls the level of the signal at the input stage of the
preamp. The master volume controls the level of the signal at the
output of the preamp (at the input of the power amp). Set the master
control at “12 o’clock” and the input level at zero. The input level
should then be used to control the overall output of the unit. The two
controls are provided to allow independent control of “house” volume
and “stage” volume when the unit is used as a stage monitor with a
connection to a house PA. See the discussion under “Direct Out”
below.
If you have an instrument with a particularly “hot” output such as an
active bass guitar and you find that the front end of the preamp is
clipping or being overdriven, a 6 dB gain reduction option is available
Inputs
To avoid an audible “pop”, set the input level control all the way
off when switching on the phantom power.
Controls
Level
5
via a jumper on the preamp control printed circuit board. How do
access and utilize this option is described in “Jumper Options” section
found on page 11.
Each tone control has a center detent at the flat position. Experiment
with settings to achieve the frequency balance that sounds best to
you. In general, small values of boost and cut are best. The Clarus
preamp is designed with flat frequency response so only minor
corrections should be required to compensate for room effects or
“peaky” pickups in order to maintain the balanced response desired
for acoustic instrument amplification. To minimize electronic noise,
avoid operating all controls simultaneously at their maximum settings.
The Low control is a shelving-type that affects frequencies below 150
Hz and with a maximum boost/cut of 12 dB. The Lo Mid control affects
frequencies between 70 Hz and 700 Hz (peak at 250 Hz) and has a
maximum boost/cut of 12 dB. The Hi Mid control affects frequencies
between 700 Hz and 3000 Hz (peak at 1200 Hz) with a maximum
boost/cut of 12 dB. The Hi control is also a shelving-type that affects
frequencies above 3500 Hz with a maximum boost/cut of 12 dB.
The Clarus preamp has a sweepable low cut filter and phase reverse
switch in each channel. The low cut filter is a variable frequency type
that inserts a 12 dB per octave rolloff at frequencies between 30 and
150 Hz, depending on the position of the control. The low cut filter is
used to reduce the bass output in cases where room location or
instrument/pickup combination results in “boomy” sound. Press the
on/off switch to turn on the filter circuit. Start with the frequency control
fully counterclockwise and gradually turn it clockwise until the desired
effect is achieved. The frequency range of the control is limited in
order to give you more control in the critical low frequency range. As a
result, the effect you hear in normal circumstances may be subtle, but,
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 preamp circuit board. How
this is done is described in the section entitled “Jumper Options.” This
can be done on either or both channels.
Tone
Low Cut Filter/Phase Reverse/Speaker Emulation Filter

6
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.
The Clarus preamp 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 3 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.
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 Clarus preamp. 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 combo amp) and the “house” volume
(the volume in the house PA system) when the unit is used as 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.
Effects Loop
Direct Out
Mute Switch
If you are not
getting any sound out of the amp, check to make sure that the
mute switch is off.
Preamp Output
Stereo Operation
Effects
A switch is provided to allow you to mute the output of the Clarus
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.
There are 1/4 inch jacks labeled “Preamp Out” on the rear panel of the
Clarus for accessing the output of the preamp.. When the Clarus
preamp is in mono mode, the top jack, labeled “Ch 1” or “Mono” is the
output to use.
An internal jumper option is available to allow the Clarus preamp to
operate in true stereo mode. The output of channel 2 can be
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 the 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 internal power amp, so it will not be heard through a speaker
connected to the Clarus.
The Clarus preamp 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 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, the selected 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.
7

Pseudo Stereo Operation
only
channel 2 has this feature, connecting to channel 1 won’t work in
this mode
Headphone Output
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.
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 (
) 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.
The pseudo stereo mode of operation requires a power amp to be
connected to each rear panel output. It is not available using the
internal power amp of the Clarus.
There is headphone output on the rear panel of the Clarus. 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.
8
Signal Flow Diagram
9
Low High
Lo Mid
Freq
Tone
Controls Filter
Ch1 Pre Out
Ch1 Effects
Loop
Ch2 Pre Out
Ch2 Effects
Loop
Headphone Headphone
Amp
I/O Board-Rear Pa
Hi Mid
Low Cut
Spkr Em
(Optional)
Low High
Lo Mid
Freq
Tone
Controls Filter
Hi Mid
Low Cut
Spkr Em
(Optional)
Power Supply
From
Flex
Cab
48 +V -V
From
18V
Ext
Supply
+10 dB
-6 dB
gain
jumper
-6 dB
gain
jumper
+10 dB
Ch 1
Ch 2
Phantom
Power
Phantom
Power
Input
Level
Input
Level
Simulated
Stereo Output
Note: all switches are illuminated
when in the on position

10
Control Panel
2
1
3
1 Reverb
2 Del/Rev
3 Delay
10dB
Off
10dB
I/O Buss
nel
Phase Inv
Phase Inv
Effects
Prog Select LevelRate
Ch 2
jumper
Effects
On/Off
Effects
On/Off
Gnd Lift
Direct Out Pre/Post
10 db
Pad
Master
Level
Mute
Power
Amp
Speaker
Outputs
11
Limiter Switch
Internal Jumper Options
Under extreme playing conditions such as high volume or when
driving a low impedance speaker load, the Clarus may be pushed
beyond its limits. When that happens, you will hear high distortion and
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 amp head, 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.
On the back side of the Clarus preamp control 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 5 screws that hold the front panel to the
chassis and remove the panel and preamp from the chassis .
Aphoto of the back side of the circuit board is shown below:
Looking closely at the circuit board in the vicinity of the jumpers, you
can see that each has a label that tells you the option that has been
selected by the jumper. The Gain Jumper is labeled “Norm” or “-6 dB.”
If the shunt is under “Norm,” the normal gain option is selected. The
Filter Jumper is labeled “Invert” or “LP.” If the shunt is under “LP,” the
low pass filter, or speaker emulator has been selected. As you can
see, each channel has a jumper option, so you can select the same or
a different option for each one. The Ch 2 Jumper is labeled “Out” or
“In.” If the “In” position is selected, channel 2 is disconnected from the
output buss and is connected to the Ch 2 Preamp Out jack on the rear
panel. (Hopefully that nomenclature is not too confusing.)
Gain Jumpers
Filter Jumpers
Ch 2 Jumper

12
Once you have made the jumper selections you want, reinstall the
preamp in the chassis.
Speakers are connected via speakon connectors (“twist lock” type)
located on the rear panel. These connectors are used because of their
low contact resistance and non-shorting operation. The output of each
Speakon connector is wired to pole “1”. Make sure the cables you use
to connect a speaker (and the speakers themselves) are similarly
wired.
The power amplifier is capable of driving speaker loads as low as 2
ohms. Use a high quality speaker system in order to get the maximum
performance from the amp. The Acoustic Image Coda EX, Corus EX
or Ten2 EX are excellent choices. As mentioned above, the power
amp is short circuit protected. If a short is connected to a speaker jack,
the output signal will be interrupted until the short is removed. Note
that when using a 1/4 inch type speaker plug, there is a momentary
short that occurs when the plug is put into the jack. That short can
cause a problem for the amp.
There may be times when you want to operate the amp without a
speaker connected to it. For example, you may want to record using
the Direct Out and don’t want the output of the amp to be heard
through a speaker. In that case, set the master level to zero. By setting
the master level to zero, the signal to the power amp is turned off and it
is not driven without a speaker load which can damage the amp.
Power Amp
Connecting a Speaker
Use Class 2 wiring for speaker cables.
Operation Without a Speaker Connected
Be
sure to set the master level to zero when a speaker load is not
connected to the amp. Operating the amp with no load and the
master level turned up can damage the amp.
To be on the safe side, you should
shut off the power to the amp before connecting or
disconnecting speakers from the unit.
The amp head component of our combo amps can be removed and
used as a stand-alone amplifier. To remove the head unit, first
disconnect the speaker “pigtail” that connects the speaker cabinet to
the amp, then unscrew the docking screws on the rear panel until they
are loose. Grip the cabinet as shown and use the tips of your fingers to
push the head unit out. The fit is quite snug so some force will be
needed.
Once you have removed the head, you will notice the rubber feet
stored in a compartment on the bottom. Remove the feet and screw
them into the four positions on the bottom of the head. When you want
to put the head back into the cabinet, you will have to remove the feet
and put them back into the storage compartment.
To reinsert the head unit, grip the cabinet as shown and push it in with
your thumbs. Again, the fit is snug so some force will be needed. Once
the head unit is in place, tighten the docking screws to pull the head
tight to the docking plate. Reconnect the speaker cable and the unit is
ready to go.
The omnidirectional low frequency output of our speaker cabinets
makes speaker placement relatively noncritical. You will easily be
heard all over the bandstand no matter where one or more are located.
However, best results are obtained when the cabinet is placed on the
floor. Putting the unit on a shelf or stand will reduce bass frequencies.
There may be circumstances where this is desirable. Feel free to
experiment to find the sound that is best for you.
In some settings, such as a hollow stage or small, “boomy” room, your
amp or enclosure will produce too much bass. One way to cut
unwanted bass output is to use the built in tilt back feature to lift the
front of the cabinet, reducing the coupling to the floor. To do this, pull
the stand into its forward position and set the combo in place on the
floor. The stand is spring loaded so when you pick up the unit, the
Docking System
Speaker Placement (Combos or Extension Cabs)
Tilt Mechanism
13
Operation--Speaker Cabinets
Removal Insertion

stand will spring back into its storage position. You may want to use the
tilt stand at all times in order to aim the high frequency output of the
speaker toward your ear so that you can better hear the amp.
An extension speaker (ideally, one of our cabinets which is matched to
the specific combo unit) can be connected to the amp to increase its
output level using the jack provided on your amp’s rear panel.
Speakers are connected via speakon connectors (“twist lock” type).
These connectors are used because of their low contact resistance
and non-shorting operation. The output of each Speakon connector is
wired to pole “1”. Make sure the cables (and cabinets) you use to
connect an external speaker are similarly wired.
The combo amp has two outputs on the rear panel but one of them is
used to connect to the internal speaker via the short jumper cable. So,
one output is available for connecting an extension cabinet.
As mentioned earlier, the power amplifier in our combo amps is
capable of driving speaker loads as low as 2 ohms. Use a high quality
speaker system in order to get the maximum performance from the
amp. The amp has a short circuit protection circuit that interrupts the
signal if a short is connected to the speaker output. If you are getting
no sound when an extension cabinet is attached, check to see if the
extension has a short in it.
A switch that controls the output level of the midrange driver is
mounted on the docking panel of the Coda and Corus combo units.
We call it the Presence switch. The switch allows the Coda to sound
brighter and more forward, or in the case of the Corus amp, it can be
used to make it sound less forward. Play through the combo and try
the switch in each position to see which position sounds best to you.
You will hear the relative level of the mid and high frequencies change
as you flip the switch. You may find that the more forward sound is
helpful when you are playing in noisy environments.
So, what’s the difference between the Corus and the Coda? The
preamp and power amp of the Corus are the same as those used in
the Coda. The Corus uses a different woofer. It is more efficient and
has slightly less bass response. When coupled with the other speaker
in the two-way system and after the crossover is adjusted for the
higher efficiency of the woofer, the result is still a flat response like the
Coda but the low frequency 3 dB point is higher (60 Hz versus 40 Hz)
and the overall efficiency of the system is higher (94 dB versus 90 dB).
Thus the Corus is more optimized for non bass instruments than the
other combos. In particular, guitar, keyboard and violin players will like
the sound of the Corus. The higher efficiency gives it a more
Connecting An Extension Speaker
Presence Switch (Coda and Corus)
Description of the Corus Combo
Use Class 2 wiring
for speaker cables.
14
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“forward” sound that these instrumentalists prefer. The slightly higher
low frequency cut off is not noticeable with guitar.
The Corus EX has the same speaker components and the Corus
combo and the perfect match to the combo when additional volume is
needed. The Corus combo and Corus EX have a gray front grill so
they look a little different and can be easily distinguished from the
other combos.
The tweeter level control is located on the rear panel of the speaker
cabinet (see picture of the rear panel below). It is a three position
switch with a selection of zero attenuation, 6 dB attenuation or off. The
tweeter operates from 3000 Hz and up so it’s effect on the sound will
be audible. Under most circumstances, it should be operated with
zero attenuation. Experiment with the control and pick the level of
attenuation that sounds best to you.
The Room Coupling Control is also located on the rear panel of the
Ten2 speaker cabinet. It is used to control the low frequency output of
the downfiring woofer. It is useful in controlling “boominess” in difficult
acoustic settings. It is a three position switch with settings of 100%,
75% and 50%. At the 100% setting, the downfiring woofer is operating
at full output. At the 75% setting, it’s output is reduced slightly. Use this
setting when there is only moderate boominess in the room. At the
50% setting, the output is reduced even more. Use this setting for the
most difficult situations. Experiment with the control so you can get a
good idea of its effect on the sound.
The Ten2 EX is the speaker cabinet portion of the Ten2 combo. It is
about 3 inches shorter and about 7 pounds lighter than the Ten2
because the docking bay for the amplifier is not attached and the amp
head is not provided. It has the same speakers and the same
performance as the Ten2. It is the ideal extension cabinet for the Ten2
but it can also be used effectively with any of our other 1x10 combo
amps. In fact, the other combos can be stacked on top of the Ten2 EX
to create a compact 3x10 system.
Tweeter Level Control (Ten2, Ten2 EX)
Room Coupling Control (Ten2, Ten2 EX)
Description of the Ten2 EX
Ten2 and Ten2 EX Rear Panel
75%
50%
R
o
o
m
C
o
u
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l
i
n
g
C
o
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t
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o
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100%
-6 dB
0 dB
T
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A t
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Off

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System (all models)
Amp Head
Frequency Response 30 Hz-18 kHz (40-14 kHz ±3 dB)
50 Hz-18 kHz (60-14 kHz ±3 dB) Corus
Max SPL >112 dB at 1 meter, >115 dB at 1 meter
(Corus), >118 dB/m (Ten2)
AC Power 100V to 240V, 50/60 Hz, automatically
switched
Size 12”Hx15”Wx13”D (Coda, Corus, EX)
17”Hx15”Wx13”D (Ten2), 14”H (EX)
10”x8”x3.5” (Clarus)
Weight 22 lbs (Coda, Corus, 19 lbs (EX)
32 lbs (Ten2), 25 lbs (EX)
4 lbs (Clarus)
Frequency Response 20 Hz - 20 kHz (±0.5 dB)
Signal to Noise Ratio >110 dB at direct out
Mic Input 600 ohm balanced, XLR connector,
switchable 10 dB gain
Phantom Power 48 volts, on/off switch w/LED indicator
Instrument Input 1 M impedance, 1/4 inch jack
Direct Out +4 dB, balanced, XLR, ground lift,
pre/post EQ selector, switchable 10 dB
pad
Effects Loop Parallel type
Low Control Shelving type, ±12 dB at 50 Hz
Low Mid Control ±12 dB at 250 Hz
Hi Mid Control ±12 dB at 1200 Hz
Treble Control Shelving type, ±12 dB at 8 kHz
Low Cut Filter -12 dB/octave sweepable from 30 to 150
Hz
Phase Reverse Switchable 180 degree phase reverse
Speaker Emulator (if selected) -12 dB/octave at 4 kHz
Type 24 bit digital with 3 programs
Programs Reverb with variable decay time,
Delay/Reverb with variable delay time
Delay with variable delay time
All have variable wet/dry mix and
“pseudo stereo” capability
Controls and Inputs
Effects
W
Specifications
Topology Class D (PWM)
Switching Frequency 500 kHz
Output Power 8 300W rms continuous, 350W rms music
(40% duty cycle), 500W peak transient
Output Power 4 500W rms continuous, 650W rms music
(40% duty cycle), 1000W peak transient
External Speaker Output Speakon type (pole 1), 2 min
load including internal speakers, if
connected
Woofer 10 inch, downfiring
Midrange 5 inch, forward firing with 2 position level
control switch
Crossover Passive, alignment corrected
Impedance 8
Power rating 250W
Woofer Dual 10 inch, one downfiring with level
control, one forward firing
Tweeter 2.5 inch forward firing with attenuation
control
Crossover Passive, alignment corrected
Impedance 4
Power rating 500W
Fitted slip cover with cord storage
pocket and shoulder strap (combo
amps)
Gig bag with shoulder strap, Speakon
to 1/4 inch adapter (amp head)
Padded gig bag with shoulder strap
made by Mooradian, kit to convert
cabinet with head removed to an
extension cab (adapter, filler panel,
padded case for head)
Power Amp
Supplied Accessories
Available Accessories
W
W
W
W
W
Speaker System (Coda, Corus)
Speaker System (Ten2)
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Shoulder Strap
To use the shoulder strap to transport a combo amp, feed the strap
through the handle opening on the speaker cabinet (both sides) and
clip the end to the D-ring attached to the strap. The picture below
illustrates how to attach the strap. The strap can be used either with
the slip cover in place or not in place.
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Care
Warranty and Repair
Acoustic Image combos and cabinets are made from injection molded
polymer materials. The amp heads are powder coated aluminum. A
little care will keep yours looking new for years to come. Use a clean,
dry cloth to clean the cabinet and metal parts of the amplifier.
We stand behind our products with a full warranty of five years from
the date of purchase. Speaker components are warranted for 180
days. Should a problem arise, please call us before returning your
amplifier or enclosure. Naturally, our warranty does not cover
products that have been damaged through misuse. Be sure to check
our web site regularly, we have an FAQ section and we post helpful
information for getting the most out of your Acoustic Image product.
Be sure to check out our YouTube channel which is accessible from
our web site, we have a video version of this manual there.
Warranty Information
Serial Number _______________
Acoustic Image Phone: [phone]
5820 Triangle Drive Fax: [phone]
Raleigh, NC 27617
www.acousticimg.com
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FCC COMPLIANCE NOTICE
This device complies with part 15 of the FCC rules. Operation is subject to the following
two conditions: (1) This device may not cause harmful interference, and (2) this device
must accept any interference received, including interference that may cause undesired
operation.
CAUTION: Changes or modifications not expressly approved by the party responsible for
compliance could void the user’s authority to operate the equipment.
NOTE: This equipment has been tested and found to comply with the limits for a Class B
digital device, pursuant to part 15 of the FCC rules. These limits are designed to provide
reasonable protection against harmful interference in a residential installation. This
equipment generates, uses and can radiate radio frequency energy and, if not installed
and used in accordance with the instruction manual, may cause harmful interference to
radio communications. However, there is no guarantee that interference will not occur in a
particular installation. If this equipment does cause harmful interference to radio or
television reception, which can be determined by turning the equipment off and on, the
user is encouraged to try to correct the interference by one or more of the following
measures:
--Reorient or relocate the receiving antenna.
--Increase the separation between the equipment and
receiver.
--Connect the equipment into an outlet on a circuit different
from that to which the receiver is connected.
--Consult the dealer or an experienced radio/TV technician
for help.
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© 2013 Acoustic Image LLC