Atlas AA240 User manual

– 1 – AtlasSound.com
Specifications are subject to change without notice.
Owner’s Manual AA240 Mixer Amplifier
1601 Jack McKay Blvd. • Ennis, Texas 75119 U.S.A.
Telephone: [phone] • Fax: [phone]
AA240 Atlas Sound Mixer Amplifier

AtlasSound.com – 2 –
Specifications are subject to change without notice.
Owner’s ManualAA240 Mixer Amplifier
1601 Jack McKay Blvd. • Ennis, Texas 75119 U.S.A.
Telephone: [phone] • Fax: [phone]
Table of Contents
Table of Contents................................................................................................................................................................ 2
Important Safety Instructions............................................................................................................................................ 3
Introduction, Features, and Applications ......................................................................................................................... 6
Front Panel Description ..................................................................................................................................................... 7
Rear Panel Description................................................................................................................................................. 8–11
Quick Start Examples................................................................................................................................................. 12–14
Wiring the AA240 ............................................................................................................................................................. 15
Load Consideration and Overload LED .......................................................................................................................... 15
Measuring Speaker Loads ............................................................................................................................................... 16
Measuring 25V/70.7V Distributed Speaker Systems..................................................................................................... 16
Security Covers Option.................................................................................................................................................... 17
Wiring the AAVCC-10K VCA Potentiometer .................................................................................................................. 17
AA240 Block Diagram ..................................................................................................................................................... 18
Optional Input Transformer Installation ......................................................................................................................... 19
Specifications .................................................................................................................................................................. 20
Notes ............................................................................................................................................................................ 21-23
Warranty............................................................................................................................................................................ 24

– 3 – AtlasSound.com
Specifications are subject to change without notice.
Owner’s Manual AA240 Mixer Amplifier
1601 Jack McKay Blvd. • Ennis, Texas 75119 U.S.A.
Telephone: [phone] • Fax: [phone]
Important Safety Instructions
1. Read these instructions.
2. Keep these instructions.
3. Heed all warnings.
4. Follow all instructions.
5. Do not use this device near water.
6. Clean only with dry cloth.
7. Do not block any ventilation openings. Install in accordance with the manufacturer’s instructions.
8. Do not install near any heat sources such as radiators, heat registers, stoves, or other devices (including amplifiers) that produce
heat.
9. 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.
10. Protect the power cord from being walked on or pinched particularly at plugs, convenience receptacles, and the point where they
exit from the device.
11. Only use attachments/accessories specified by the manufacturer.
12. Use only with the cart, stand, tripod, bracket, or table specified by the manufacturer, or sold with the device. When a cart is used
use caution when moving the cart/device combination to avoid injury from tip-over.
13. Unplug this device during lightning storms or when unused for long periods of time.
14. Refer all servicing to qualified service personnel. Servicing is required when the device 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 device, the device has been exposed
to rain or moisture, does not operate normally, or has been dropped.
15. WARNING: To reduce the risk of fire or electric shock, this device should not be exposed to rain or moisture and objects filled with
liquids, such as a vase, should not be placed on this device.
16. To completely disconnect this equipment from the mains, disconnect the power supply cord plug from the receptacle.
17. The mains plug of the power supply cord shall remain readily operable.
PA Amplifier
Model AA35
Output Rated 35W
Designed and Engineered
by Atlas Sound
Made In CHINA
RISK OF ELECTRIC SHOCK
DO NOT OPEN
ATTENTION
RISQUE DE DECHARGE ELECTRIQUE
-NE PAS OUVRIR.
WARNING
TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK
DO NOT EXPOSE THIS APPLIANCE TO RAIN OR MOISTURE.
CAUTION
´
The lightning flash with arrowhead symbol within an
equilateral triangle, is intended to alert the user to the
presence of uninsulated “dangerous voltage “ within the
product’s enclosure that may be of sufficient magnitude
to constitute a risk of electric shock to persons.
The exclamation point within an equilateral triangle is
intended to alert the user to the presence of important
operating and maintenance (servicing) instructions in the
literature accompanying the product.

AtlasSound.com – 4 –
Specifications are subject to change without notice.
Owner’s ManualAA240 Mixer Amplifier
1601 Jack McKay Blvd. • Ennis, Texas 75119 U.S.A.
Telephone: [phone] • Fax: [phone]
CAUTION – When Installing the Product
• Plugging in or unplugging the power cord with wet hands may result in electric shock.
•Never move the device with the power cord plugged into the wall, as damage to the power cord may result.
•When unplugging the cord from the wall, grasp the plug, NOT the cord.
•Never install this device in humid or dusty locations, nor in direct sunlight, near sources of heat, or in areas where sooty smoke or
steam are present. Fire and electric shock may result.
•Keep all sides of the device at least 31⁄2" away from objects that may obstruct air flow to prevent the unit's internal temperature
rise.
Amplifier Clearance Requirements
31/2" (88.9mm)
31/2" (88.9mm)31/2" (88.9mm)
10
010 0
0 10 On
Off
Input 6
Input 5
Input 4
Input 3
Input 2
10
0
10
0
10
+
–
0
Bass Treble
010
+
–
Input 1
Master
Power
PowerLimitPeakSignal

– 5 – AtlasSound.com
Specifications are subject to change without notice.
Owner’s Manual AA240 Mixer Amplifier
1601 Jack McKay Blvd. • Ennis, Texas 75119 U.S.A.
Telephone: [phone] • Fax: [phone]
WARNING – When the Device is in Use
• To prevent electric shock, do not remove the device cover as there are high voltage components inside. Refer all servicing to Atlas
Sound.
• Should any of the following irregularities occur during use, immediately switch off the power, disconnect the power cord from the
AC outlet and contact Atlas Sound. Do not to attempt to continue operation with the device as this may cause fire or electric shock:
•Smoke or strange smell coming from the unit.
•If the device falls or the case is damaged.
•If water or any metallic objects falls into the device.
• If the power supply cord is damaged in any way.
•If the device is malfunctioning.
•Do not insert or drop metallic objects or flammable materials into the ventilation holes of the device's cover,
as this may result in electric shock or fire.
•Do not place any containers with liquid or metallic objects on the top of the device.
If any liquid spills into the unit, fire or electric shock may result.
•Never operate this device or touch the power supply cord during an electrical storm, electric shock may result.
•Never exceed the wattage on the product when connecting equipment. Fire and/or property damage may result.
•Operate the device only with the voltage specified on the unit. Fire and/or electric shock may result if a higher
voltage is used.
•Do not modify, kink, or cut the power cord. Do not place the power cord in close proximity to heaters and do not
place heavy objects on the power cord, including the device itself, doing so may result in fire or electrical shock.
•Ensure that the safety ground terminal is connected to a proper ground. Never connect the ground to a gas pipe
as a catastrophic disaster may result.
• Be sure the installation of the product is stable, avoid slanted surfaces as the product may fall and cause injury or property damage.
CAUTION – When the Device is in Use
•Never place heavy objects on the product, causing it to fall and/or break, resulting in personal injury and
property damage. In addition, the product itself may fall and cause injury and property damage.
•Contact Atlas Sound for instructions on cleaning the inside of the unit. Large accumulations of dust inside
the unit may result in heat buildup and fire.
•Ensure that the power supply plug is securely plugged into the wall outlet. Never allow dust to accumulate
on the power plug or inside the wall outlet.
•When cleaning the unit or the unit is not to be operated for an extended time period, unplug power cord
from the wall.

AtlasSound.com – 6 –
Specifications are subject to change without notice.
Owner’s ManualAA240 Mixer Amplifier
1601 Jack McKay Blvd. • Ennis, Texas 75119 U.S.A.
Telephone: [phone] • Fax: [phone]
Introduction
Congratulations and thank you for purchasing the Atlas Sound Model AA240 professional grade mixer / amplifier. An integral part of
the Strategy Series of commercial products, the AA240 was engineered and integrated with unique features to assist the contractor /
installer in today’s commercial business audio environment.
Features
• Zone 1 Output 240 Watts
• Zone 2 Output 1 Watt @ 8Ω or 1.5V @ 600Ω
• Inputs 1–5 Mic/Line Switchable
• Input 6 Line Level Only
• Input 1 has VOX Send
• Inputs 2-6 have Switch Selectable Mute Receive
• 2 Tape and 2 Line Outputs
• Remote VCA Selectable INPUT 6 or MASTER
• Switch Selectable Bridge In/Out Bus Allows Amplifier Combining
• Pre-Amp Out-Power Amp in Loop
Applications
The AA240 will be right at home in large retail, commercial, and industrial paging and background music applications. Hotels and
conference centers will appreciate the room combining and remote volume control features that this product provides.

– 7 – AtlasSound.com
Specifications are subject to change without notice.
Owner’s Manual AA240 Mixer Amplifier
1601 Jack McKay Blvd. • Ennis, Texas 75119 U.S.A.
Telephone: [phone] • Fax: [phone]
Front Panel Description
1. Power Switch
This push on / push off switch applies power to the AA240.
2. Power LED
This LED will illuminate blue when the AA240 is turned on.
3. Peak LED
The PEAK LED will illuminate Red when the AA240 is in a clipping condition, caused by excessively high input levels or a GAIN con-
trol is turned up too high. An occasional flash is OK.
4. Limit LED
This LED will illuminate Yellow when the amplifier is consuming excessive current. At that point, a limiting circuit is being activated,
preventing the amplifier from failure. The most likely cause for the fault is an incorrect load impedance on the output of the ampli-
fier. The LED should never come on if a proper load is applied.
Note: An occasional LED flash is okay. When LED is ON audible distortion may be heard at the speakers.
5. Signal LED
This LED will assist you in setting gain structure into the amp. With a source connected to the amp and playing, turn up the chan-
nel gain control until this LED just starts to flash green. Once all the sources connected are playing, the SIGNAL LED may be on
solid. This condition is normal.
6. Master Gain Control
The MASTER GAIN CONTROL will raise or lower all the input channels together. A good starting point for setting gain structure is
to set MASTER GAIN CONTROL at the 12:00 position, and then adjust the individual channels one at a time.
7. Input 1-6 Controls
The gain for input channels 1-6 are controlled by these rotary controls. The MASTER GAIN CONTROL must be turned up in addition
to the input controls for audio to be present at the speaker terminals.
8. Bass Control
The BASS CONTROL is a shelving type control which will boost or cut bass frequencies at 100Hz at the rate of ±6dB.
9. Treble Control
The TREBLE CONTROL is a shelving type control which will boost or cut treble frequencies at 10kHz at the rate of ±6dB.
10
010 0
0 10 On
Off
Input 6
Input 5
Input 4
Input 3
Input 2
10
0
10
0
10
+
–
0
Bass Treble
010
+
–
Input 1
Master
Power
PowerLimitPeakSignal

AtlasSound.com – 8 –
Specifications are subject to change without notice.
Owner’s ManualAA240 Mixer Amplifier
1601 Jack McKay Blvd. • Ennis, Texas 75119 U.S.A.
Telephone: [phone] • Fax: [phone]
Rear Panel Description
10. Dipswitch “A” Positions 1–6
Understanding the functionality of the dipswitches is key to getting the most out of the AA240. Whether the switch is in the “Up”
or “Down” position is critical to the function of the amplifier.
Note: Mispositioning any of these switches may cause harm to the speakers or amplifier. We recommended all levels be
turned down prior to making any switch selections. Pay close attention to the two assignment charts and manual for
proper settings.
Dipswitch 1 - LOW CUT
When in the “ON” position, frequencies below 400Hz are attenuated at the rate of
6dB per octave.
Note: The rotary bass control is bypassed when the LOW CUT filter is on. We
suggest that when paging horns are connected to the AA240, engage the
LOW CUT filter to prevent the horns from operating below their cut off frequency.
When “OFF”, the amplifier operates full bandwidth.
Dipswitch 2–6 - MUTE RCV (RECEIVE)
When “ON”, Input's 2–6 signals will be muted upon a signal present on Input 1 (Refer to Number 11 Input 1 Sens), or a contact
closure on the remote mute terminals (Refer to Number 16 Remote Mute).
11. Dipswitch “B” Positions 1–8
Dipswitch 1
When set to the “100mV” position, the sensitivity of Input 6 is
suitable for inputting Telephone Paging Signals. When set to the
“300mV” position, the sensitivity of Input 6 is suitable for CD/DVD
player outputs.
Dipswitch 2–5
When set to the “Line” position, input sensitivity is suitable for CD/DVD line level inputs.
When set to the “Mic” position, sensitivity is suitable for microphone inputs.
Dipswitch 6
When set the “Tel/Line” position, Input 1 sensitivity is suitable for telephone paging and line level signals.
When set to the “Mic” position, the sensitivity is set for microphone signals.
Dipswitch 7
When set to the “OFF” position, PHANTOM POWER is turned off on INPUTS 1–5.
When set to the “ON” position, PHANTOM POWER (24VDC) is available on INPUTS 1–5.
Note: The Phantom Power when activated is present for both Line and Mic modes. In some Line source input application the
Phantom Power may cause popping. This can be corrected by adding a 10uf – 100uf / 50V electrolytic capacitor in series with
the input. Contact Atlas for an application note.
Dipswitch 8
When set to the “Master” position, the VCA control port acts as an overall system remote volume control, adjusting all the input
channels present on the master section mix bus up or down simultaneously. When set to the “Input 6” position, the VCA remote
control port affects only the level of INPUT 6.
10
010 0
0 10 On
Off
Input 6
Input 5
Input 4
Input 3
Input 2
10
0
10
0
10
+
–
0
Bass Treble
010
+
–
Input 1
Master
Power
PowerLimitPeakSignal
VCA
In/Out
Bridge
Sel
Zone 2 Out
Ω
1W 8 Ω 600
Remote
Mute
Input 2
Trim
Input 3
Trim
Input 5
Input 6
Off
On
Off
On
Off
On
Off
On
Input 2
On
Off
Line
Mic
Line
Mic
Line
Mic
Sens
Input 1
Input 2Input 3
Input 4Input 5 Phantom
On
Off
Input 6
12 3 45
300mV
100mV
67
Master
Line
Mic Mic
Tel/Line Off
On
Mute Rcv
Input 6 Input 5 Input 4 Input 3
VCA
51 2 3 4
8
Low Cut
6
Input 1
Sens
Input 1
Trim
Input 4
Trim
Input 5
Trim
Zone 2
Level
B
A
Line Out
Speaker Output 240W
Ω100V70V25V4Com
+ +
G+
R
L
Pre Out
Pwr In
Tape Out Input 6
Input 4 Input 3 Input 2 Input 1
Unswitched Outlet
120V ~60Hz
Max 500W
Outlet Breaker
125V ~4A
Push Reset
G+ G+ G+ G+
+
G
120V AC 60Hz 700W 1601 Jack McKay Blvd., Ennis, TX 75119
[phone] AtlasSound.com
CLASS 2 WIRING
10
010 0
0 10 On
Off
Input 6
Input 5
Input 4
Input 3
Input 2
10
0
10
0
10
+
–
0
Bass Treble
010
+
–
Input 1
Master
Power
PowerLimitPeakSignal
VCA
In/Out
Bridge
Sel
Zone 2 Out
Ω
1W 8 Ω 600
Remote
Mute
Input 2
Trim
Input 3
Trim
Input 5
Input 6
Off
On
Off
On
Off
On
Off
On
Input 2
On
Off
Line
Mic
Line
Mic
Line
Mic
Sens
Input 1
Input 2Input 3
Input 4Input 5 Phantom
On
Off
Input 6
12 3 45
300mV
100mV
67
Master
Line
Mic Mic
Tel/Line Off
On
Mute Rcv
Input 6 Input 5 Input 4 Input 3
VCA
51 2 3 4
8
Low Cut
6
Input 1
Sens
Input 1
Trim
Input 4
Trim
Input 5
Trim
Zone 2
Level
B
A
Line Out
Speaker Output 240W
Ω100V70V25V4Com
+ +
G+
R
L
Pre Out
Pwr In
Tape Out Input 6
Input 4 Input 3 Input 2 Input 1
Unswitched Outlet
120V ~60Hz
Max 500W
Outlet Breaker
125V ~4A
Push Reset
G+ G+ G+ G+
+
G
120V AC 60Hz 700W 1601 Jack McKay Blvd., Ennis, TX 75119
[phone] AtlasSound.com
CLASS 2 WIRING
VCA
In/Out
Bridge
Sel
Zone 2 Out
Ω
1W 8 Ω 600
Remote
Mute
Input 2
Tr i m
Input 3
Tr i m
Input 5
Input 6
Off
On
Off
On
Off
On
Off
On
Input 2
On
Off
Line
Mic
Line
Mic
Line
Mic
Sens
Input 1
Input 2Input 3
Input 4Input 5 Phantom
On
Off
Input 6
12 3 45
300mV
100mV
67
Master
Line
Mic Mic
Tel/Line Off
On
Mute Rcv
Input 6 Input 5 Input 4 Input 3
VCA
51 2 3 4
8
Low Cut
6
Input 1
Sens
Input 1
Tr i m
Input 4
Tr i m
Input 5
Trim
Zone 2
Level
B
A
Line Out
Speaker Output 240W
Ω100V70V25V4Com
+ +
G+
R
L
Pre Out
Pwr In
Tape Out Input 6
Input 4 Input 3 Input 2 Input 1
Unswitched Outlet
120V ~60Hz
Max 500W
Outlet Breaker
125V ~4A
Push Reset
G+ G+ G+ G+
+
G
120V AC 60Hz 700W 1601 Jack McKay Blvd., Ennis, TX 75119
[phone] AtlasSound.com
CLASS 2 WIRING

– 9 – AtlasSound.com
Specifications are subject to change without notice.
Owner’s Manual AA240 Mixer Amplifier
1601 Jack McKay Blvd. • Ennis, Texas 75119 U.S.A.
Telephone: [phone] • Fax: [phone]
12. Input 1 Sens
This control adjusts how sensitive the mute send circuitry on INPUT 1 reacts. Setting the control fully counter clockwise will lower
the sensitivity and a higher amplitude signal will be required at INPUT 1 to trigger the mute send circuits. Fully clockwise will raise
the sensitivity of the mute circuits, where a lower amplitude signal will trigger a mute send. Careful calibration of this control may
be required to fully utilize the mute circuits’ capabilities. Adjustment of this control should occur after the input trim (13) for channel
1 is set.
13. Inputs 1-5 Trim
These variable controls allows fine tuning of the gain of INPUTS 1 – 5. There is 20dB of variable gain available. The trim only applies
when the input is set to the “Mic” position on the dipswitch.
14. Zone 2 Level
This rotary control will vary the signal level at the Zone 2 output terminals. Fully counter-clockwise (0) is off; fully clockwise (10) is
the maximum output level. The Zone 2 output gets its signal from INPUT 6.
15. VCA
Remote location of the level control can be accomplished via the VCA control port. You can control the overall level (Master) or
just Input 6. This selection is made via Dipswitch “B” position #8. Connect the two leads from the optional remote volume control
(AAVC-10K) to these terminals. This remote level control is POST Master and Input 5 Level Controls. Set the system's maximum
levels using the amplifier level controls and then use the remote VCA potentiometer as an attenuator from the maximum levels set.
See the VCA setup section for instructions on wiring the potentiometer.
16. Remote Mute
The Remote Mute feature is useful when the background system needs to be muted from a remote location. When shorting the
Remote Mute terminals together, (G) to (M), the assigned channels will be muted.
Note: Input 1 cannot be VOX or remote muted at anytime. Dipswitches 2-5 settings determine which inputs are to receive the
Mute trigger. To trigger the mute it is common to use an external contact closure or switch on a microphone.
17. Zone 2 Output – 600Ω
The 600Ω 1.5V (Zone 2 Out) output is typically connected to a PBX MUSIC ON HOLD port, also known as MOH. The ZONE 2 out-
put gets its signal from INPUT 6.
18. Zone 2 Output – 1 Watt 8Ω
The 8Ω 1W Zone 2 output can drive an external 8Ωspeaker, and is taken Pre input 6 gain control. Use the 1W 8Ωterminals for con-
nection to an external speaker.
19. Bridge In/Out
Certain installations have the need to combine one or more mixers together. These mixers may be in different rooms of an install
but have the need to share a page or music throughout the installation. These terminals provide a way to send and receive bal-
anced line level signals from the internal mix bus of the AA240. The “BRIDGE IN/OUT” feature is PRE Tone Controls and Low Cut
Filter the Bridge In/Out feature allows you to send and receive a balanced signal. This is important for allowing longer distances
between the mixers.
Note: This function should ONLY be used with other Atlas Sound mixers that have this feature. The Send and Receive signals are
combined through the same terminals. To activate this feature, see number 20 Bridge Select.
VCA
In/Out
Bridge
Sel
Zone 2 Out
Ω
1W 8 Ω 600
Remote
Mute
Input 2
Tr i m
Input 3
Tr i m
Input 5
Input 6
Off
On
Off
On
Off
On
Off
On
Input 2
On
Off
Line
Mic
Line
Mic
Line
Mic
Sens
Input 1
Input 2Input 3
Input 4Input 5 Phantom
On
Off
Input 6
12 3 45
300mV
100mV
67
Master
Line
Mic Mic
Tel/Line Off
On
Mute Rcv
Input 6 Input 5 Input 4 Input 3
VCA
51 2 3 4
8
Low Cut
6
Input 1
Sens
Input 1
Tr i m
Input 4
Tr i m
Input 5
Trim
Zone 2
Level
B
A
Line Out
Speaker Output 240W
Ω100V70V25V4Com
+ +
G+
R
L
Pre Out
Pwr In
Tape Out Input 6
Input 4 Input 3 Input 2 Input 1
Unswitched Outlet
120V ~60Hz
Max 500W
Outlet Breaker
125V ~4A
Push Reset
G+ G+ G+ G+
+
G
120V AC 60Hz 700W 1601 Jack McKay Blvd., Ennis, TX 75119
[phone] AtlasSound.com
CLASS 2 WIRING

AtlasSound.com – 10 –
Specifications are subject to change without notice.
Owner’s ManualAA240 Mixer Amplifier
1601 Jack McKay Blvd. • Ennis, Texas 75119 U.S.A.
Telephone: [phone] • Fax: [phone]
20. Bridge Select
The “Bridge Select (Sel)” terminals are the access point to activate the “Bridge In/Out” feature. To activate the feature connect
the two points together via an external contact closure. These two points must be connected to send or receive any signal. By
connecting the Bridge In/Out terminals of two AA240s, a simple room combining system can be accomplished. If using a remote
switch and closing it, the “Bridge Select (Sel)” will combine the amps as one, opening the switch will separate the two amps.
Note: If combining 3 or 4 mixers together the output level will have to be adjusted before and after Bridge Sel terminals are con-
nected (shorted) together. We suggest utilizing the Remote Level control when using this feature.
21. Input 1
Balanced mic or line level signals connect to the (+) (–) and (G) terminals. Refer to the chart above “Multi
Function Dipswitch” for the following setting. Dipswitch 6, labeled “Input 1” must be set to the proper position for mic or Tel/Line
level. If you are connecting an unbalanced line level input, tie (short) the (G) and (–) terminals together. An optional Input Isolation
Transformer (AAIT-600) is available if a ground loop problem exists. See page 20 for transformer installation. Contact Atlas Sound
for more details on the Input Isolation Transformer.
Note: Input 1 cannot be muted from other channels. This channel is the VOX mute send to the other inputs that are set to Mute
Receive. The sensitivity and threshold for the VOX send works in conjunction with the Input 1 Trim and the Input 1 Sens.
22. Inputs 2-5
Inputs 2-5 are balanced, line or mic level (Refer to Dipswitch Bank “B” 2-6 for setting input sensitivity). For wiring unbalanced
inputs, tie (short) the (G) and (–) terminals together.
Note: The Phantom Power when activated is present for both Line and Mic modes. In some Line source input application the the
Phantom Power may cause popping. This can be corrected by adding a 10uf - 100uf/ 50V electrolytic capacitor in series with
the input. Contact Atlas for an application note.
23. Input 6
INPUT 6 consists of a pair of stereo summing, line level inputs. Connect unbalanced audio outputs here such as CD players or
audio from DVD players.
24. Line Out A/B
The LINE OUT connector is useful for providing unbalanced line level signal to another amplifier or other external devices. Prior to
using this feature one must understand where the internal signal pick up point is so you can decide if it is correct for your applica-
tion. We suggest you refer to the block diagram of the AA240 to have a complete understanding of the signal flow.
Note the following conditions for LINE OUT:
A. Post Low Cut Filter
B. Post Tone Controls (meaning the settings for the Bass and Treble controls affect this signals output).
Note: Refer to Low Cut Filter Switch for complete understanding of the LCF feature.
C. Post Amp In (meaning any signal that is inserted into the Pre AMP In jack will be present at the Line Out).
VCA
In/Out
Bridge
Sel
Zone 2 Out
Ω
1W 8 Ω 600
Remote
Mute
Input 2
Tr i m
Input 3
Tr i m
Input 5
Input 6
Off
On
Off
On
Off
On
Off
On
Input 2
On
Off
Line
Mic
Line
Mic
Line
Mic
Sens
Input 1
Input 2Input 3
Input 4Input 5 Phantom
On
Off
Input 6
12 3 45
300mV
100mV
67
Master
Line
Mic Mic
Tel/Line Off
On
Mute Rcv
Input 6 Input 5 Input 4 Input 3
VCA
51 2 3 4
8
Low Cut
6
Input 1
Sens
Input 1
Tr i m
Input 4
Tr i m
Input 5
Trim
Zone 2
Level
B
A
Line Out
Speaker Output 240W
Ω100V70V25V4Com
+ +
G+
R
L
Pre Out
Pwr In
Tape Out Input 6
Input 4 Input 3 Input 2 Input 1
Unswitched Outlet
120V ~60Hz
Max 500W
Outlet Breaker
125V ~4A
Push Reset
G+ G+ G+ G+
+
G
120V AC 60Hz 700W 1601 Jack McKay Blvd., Ennis, TX 75119
[phone] AtlasSound.com
CLASS 2 WIRING
10
010 0
0 10 On
Off
Input 6
Input 5
Input 4
Input 3
Input 2
10
0
10
0
10
+
–
0
Bass Treble
010
+
–
Input 1
Master
Power
PowerLimitPeakSignal
VCA
In/Out
Bridge
Sel
Zone 2 Out
Ω
1W 8 Ω 600
Remote
Mute
Input 2
Trim
Input 3
Trim
Input 5
Input 6
Off
On
Off
On
Off
On
Off
On
Input 2
On
Off
Line
Mic
Line
Mic
Line
Mic
Sens
Input 1
Input 2Input 3
Input 4Input 5 Phantom
On
Off
Input 6
12 3 45
300mV
100mV
67
Master
Line
Mic Mic
Tel/Line Off
On
Mute Rcv
Input 6 Input 5 Input 4 Input 3
VCA
51 2 3 4
8
Low Cut
6
Input 1
Sens
Input 1
Trim
Input 4
Trim
Input 5
Trim
Zone 2
Level
B
A
Line Out
Speaker Output 240W
Ω100V70V25V4Com
+ +
G+
R
L
Pre Out
Pwr In
Tape Out Input 6
Input 4 Input 3 Input 2 Input 1
Unswitched Outlet
120V ~60Hz
Max 500W
Outlet Breaker
125V ~4A
Push Reset
G+ G+ G+ G+
+
G
120V AC 60Hz 700W 1601 Jack McKay Blvd., Ennis, TX 75119
[phone] AtlasSound.com
CLASS 2 WIRING

– 11 – AtlasSound.com
Specifications are subject to change without notice.
Owner’s Manual AA240 Mixer Amplifier
1601 Jack McKay Blvd. • Ennis, Texas 75119 U.S.A.
Telephone: [phone] • Fax: [phone]
25. Tape Out A/B
Line level mono signals are available at this jack for connection to recording devices. The signal available here is PRE tone control
and low cut filter and comes from the internal mix bus.
26. Pre Out
The PRE OUT connector has POST tone control signals available to drive another power amp or external audio devices. Use in con-
junction with the AMP IN connector, an effects loop can be created by connecting the PRE OUT jack to a device such as an equal-
izer then back out to the AMP IN connector. See the connection diagram in the setup section of this manual.
27. Pwr In
The AMP IN connector is useful for converting the AA240 into a slave amp. When a line level signal is connected to this input, the
internal connection between the preamp and internal power amp is broken. The AA240 is now just a power amplifier, amplifying
audio signals applied to this connector.
28. Speaker Terminals
For loudspeaker connections, connect using the following information or proceed to the setup section for typical wiring diagrams.
COM - Speaker common or negative connection
4Ω- Connect to direct coupled loudspeakers
25V - Connect to transformer coupled, 25V loudspeakers with a total load impedance of no less than 2.6Ω.
70.7V - Connect to transformer coupled, 70.7V loudspeakers with a total load impedance of no less than 21Ω.
100V - Connect to transformer coupled, 100V loudspeakers with a total load impedance of no less than 41.6Ω.
29. Power Cord
Connect the power cord to 120VAC only. Serious damage may result if accidentally connected to other line voltages.
30. Unswitched Outlet
The 120VAC outlet is energized at all times when the AA240 power cord is connected to a live duplex outlet. Useful for connecting
Atlas work lights, etc. Keep the total power draw below 750W.
31. Circuit Breaker – Unswitched Outlet
The circuit breaker is designed to trip and shut down the AA240 “Unswitched Outlet” upon an over current condition. After correct-
ing the cause of the breaker tripping, reset the breaker by pushing in on the tab.
VCA
In/Out
Bridge
Sel
Zone 2 Out
Ω
1W 8 Ω 600
Remote
Mute
Input 2
Tr i m
Input 3
Tr i m
Input 5
Input 6
Off
On
Off
On
Off
On
Off
On
Input 2
On
Off
Line
Mic
Line
Mic
Line
Mic
Sens
Input 1
Input 2Input 3
Input 4Input 5 Phantom
On
Off
Input 6
12 3 45
300mV
100mV
67
Master
Line
Mic Mic
Tel/Line Off
On
Mute Rcv
Input 6 Input 5 Input 4 Input 3
VCA
51 2 3 4
8
Low Cut
6
Input 1
Sens
Input 1
Tr i m
Input 4
Tr i m
Input 5
Trim
Zone 2
Level
B
A
Line Out
Speaker Output 240W
Ω100V70V25V4Com
+ +
G+
R
L
Pre Out
Pwr In
Tape Out Input 6
Input 4 Input 3 Input 2 Input 1
Unswitched Outlet
120V ~60Hz
Max 500W
Outlet Breaker
125V ~4A
Push Reset
G+ G+ G+ G+
+
G
120V AC 60Hz 700W 1601 Jack McKay Blvd., Ennis, TX 75119
[phone] AtlasSound.com
CLASS 2 WIRING

AtlasSound.com – 12 –
Specifications are subject to change without notice.
Owner’s ManualAA240 Mixer Amplifier
1601 Jack McKay Blvd. • Ennis, Texas 75119 U.S.A.
Telephone: [phone] • Fax: [phone]
Quick Start Examples
Example 1 — System Paging, BGM, and MOH with Remote Master Level Control
This application has the paging microphone into INPUT 1, BGM (CD player) into Input 2, and a Message Repeater or MOH into Input 6.
The Zone 2 Output is sent to the telephone system's MOH input port. A level control is placed in another area such as a front desk to
adjust the system’s level without having to go the equipment room. When a page comes through Input 1, the BGM is muted allowing
only paging to be heard through the main system. The MOH is not affected during the page.
• Connect a paging mic to INPUT 1. Set Dipswitch “B” #6, “Input 1” to the “Mic” position.
Note: The INPUT 1 Trim and Sens will need to be adjusted after all the settings and connections have been set.
• Connect a BGM (CD) player to INPUT 2.
• Set Dipswitch “A” #6, “Mute Rcv” to the “ON” position.
• Connect a Message Repeater or MOH device to INPUT 6.
Note: The input sensitivity of this channel may need to be changed for proper level balance. Dipswitch “B” #1, “Input 6” allows
you to select between a 100mV or 300mV input sensitivity. Turn down channel 6 gain control on the front panel.
• Connect Zone 2 output to the MOH input on your telephone. Adjust the Zone 2 Output level as needed.
• Connect a wall mount volume control (Atlas Part Number AAVC-10K) to the terminals marked “VCA”.
Set Dipswitch “B” #8, “VCA” to “Master”.
Dipswitch Settings
Dipswitch 1 Off (Set To The Required Gain) Dipswitch 2 Off (Not Affected)
Dipswitch 3 Off (Not Affected) Dipswitch 4 Off (Not Affected)
Dipswitch 5 Off (Line) Dipswitch 6 On (Mic)
Dipswitch 7 Depends On Mic Type Dipswitch 8 Master
10
010 0
0 10 On
Off
Input 6
Input 5
Input 4
Input 3
Input 2
10
0
10
0
10
+
–
0
Bass Treble
010
+
–
Input 1
Master
Power
PowerLimitPeakSignal
VCA
In/Out
Bridge
Sel
Zone 2 Out
Ω
1W 8 Ω 600
Remote
Mute
Input 2
Tr i m
Input 3
Tr i m
Input 5
Input 6
Off
On
Off
On
Off
On
Off
On
Input 2
On
Off
Line
Mic
Line
Mic
Line
Mic
Sens
Input 1
Input 2Input 3
Input 4Input 5 Phantom
On
Off
Input 6
12 3 45
300mV
100mV
67
Master
Line
Mic Mic
Tel/Line Off
On
Mute Rcv
Input 6 Input 5 Input 4 Input 3
VCA
51 2 3 4
8
Low Cut
6
Input 1
Sens
Input 1
Tr i m
Input 4
Tr i m
Input 5
Trim
Zone 2
Level
B
A
Line Out
Speaker Output 240W
Ω100V70V25V4Com
+ +
G+
R
L
Pre Out
Pwr In
Tape Out Input 6
Input 4 Input 3 Input 2 Input 1
Unswitched Outlet
120V ~60Hz
Max 500W
Outlet Breaker
125V ~4A
Push Reset
G+ G+ G+ G+
+
G
120V AC 60Hz 700W 1601 Jack McKay Blvd., Ennis, TX 75119
[phone] AtlasSound.com
CLASS 2 WIRING
To 70V Speakers
To PBX
Page Port
Remote Wall Mounted
Volume Control
From BGM
CD Player
Message Repeater
Paging Mic
For Unbalanced Wiring, wire
Tip to +. Wire shield out and
(—) together with
a jumper wire.
BA

– 13 – AtlasSound.com
Specifications are subject to change without notice.
Owner’s Manual AA240 Mixer Amplifier
1601 Jack McKay Blvd. • Ennis, Texas 75119 U.S.A.
Telephone: [phone] • Fax: [phone]
Example 2 — Hotel Room Combining Using Two AA240s
This example utilizes the combining feature of the Atlas AA240 mixer amplifiers. The drawing below shows the equipment connections
for two hotel ballrooms, separated by a moveable air wall. The hotel needs to be able to have the audio system operate as one large
unit (air wall open) or two discreet systems (air wall closed). As indicated in the example, a BGM CD player is shared between the
two AA240s, via a “Y” cable, connected to input 6 of each mixer amp. The Bridge terminals of both amplifiers are connected together,
through a DPST switch that makes (combines) or breaks (separates) the Bridge connections between the amplifiers. When the switch
is closed, any audio signal into either amp will be present at both amplifier's speaker outputs. A volume control and DPST switch (see
drawing for clarity) controls the background music level and turns the music on or off in each room. For emergency evacuation pur-
poses, a signal from the hotel's fire alarm system is connected to channel 1 of both amplifiers, with the mute sensitivity adjusted as
needed. All other channels are set for mute receive and will mute when the siren tone is present on channel 1.
Dipswitch Settings
Dipswitch “A” 1–6
Dipswitch “B” 1–8
Dipswitch 1 (Set To The Required Gain) Dipswitch 2 Mic
Dipswitch 3 Mic Dipswitch 4 Mic
Dipswitch 5 Mic Dipswitch 6 Mic
Dipswitch 7 Depends On
Mic Type Dipswitch 8
Will depend if the remote volume
control will control just the BGM or
be a Master Volume Control.
Dipswitch 1 On Dipswitch 2 On
Dipswitch 3 On Dipswitch 4 On
Dipswitch 5 On Dipswitch 6 On
Siren tone from building EVAC system,
Ch. 1 set for mute send.
powe r
powe r
powe r
+++++
SP Out
+++++
SP Out
Ballroom "A" Microphones
Ballroom "B" Microphones
From Annunciator Panel
ON
OFF
ON
OFF
ON
OFF
Room Combine
Switch
Music On/Off Room B
Remote Volume Room B
BGM Source
Tape Record Ballroom "B"
Tape Record Ballroom "A"
70.7V Speakers Ballroom "B"
70.7V Speakers Ballroom "A"
Music On/Off Room A
Remote Volume Room A
BA
BA

AtlasSound.com – 14 –
Specifications are subject to change without notice.
Owner’s ManualAA240 Mixer Amplifier
1601 Jack McKay Blvd. • Ennis, Texas 75119 U.S.A.
Telephone: [phone] • Fax: [phone]
Example 3 — Small House of Worship
The diagram below shows a typical small House of Worship audio system. This system utilizes four microphones, one for the pulpit
and three on the choir. A Master cap volume control (Atlas Sound AAVC-10K) is connected to the “VCA” terminals for overall level
control. For background music, a CD player's audio outputs are connected to Input 6, and a recording device (cassette recorder or
computer's audio input) is connected to the Tape Out jacks. For system tuning, a 1⁄3octave graphic EQ is connected to the Pre Out /
Pwr In jacks.
Dipswitch Settings
Dipswitch “A” 1–6
Dipswitch “B” 1-8
Dipswitch 1 300mV Dipswitch 2 "Not Used"
Dipswitch 3 Mic Dipswitch 4 Mic
Dipswitch 5 Mic Dipswitch 6 Mic
Dipswitch 7 Depends On
Mic Type Dipswitch 8 Master
Dipswitch 1 On Dipswitch 2 On
Dipswitch 3 On Dipswitch 4 On
Dipswitch 5 On Dipswitch 6 On
10
010 0
0 10 On
Off
Input 6
Input 5
Input 4
Input 3
Input 2
10
0
10
0
10
+
–
0
Bass Treble
010
+
–
Input 1
Master
Power
PowerLimitPeakSignal
VCA
In/Out
Bridge
Sel
Zone 2 Out
Ω
1W 8 Ω 600
Remote
Mute
Input 2
Tr i m
Input 3
Tr i m
Input 5
Input 6
Off
On
Off
On
Off
On
Off
On
Input 2
On
Off
Line
Mic
Line
Mic
Line
Mic
Sens
Input 1
Input 2Input 3
Input 4Input 5 Phantom
On
Off
Input 6
12 3 45
300mV
100mV
67
Master
Line
Mic Mic
Tel/Line Off
On
Mute Rcv
Input 6 Input 5 Input 4 Input 3
VCA
51 2 3 4
8
Low Cut
6
Input 1
Sens
Input 1
Tr i m
Input 4
Tr i m
Input 5
Trim
Zone 2
Level
B
A
Line Out
Speaker Output 240W
Ω100V70V25V4Com
+ +
G+
R
L
Pre Out
Pwr In
Tape Out Input 6
Input 4 Input 3 Input 2 Input 1
Unswitched Outlet
120V ~60Hz
Max 500W
Outlet Breaker
125V ~4A
Push Reset
G+ G+ G+ G+
+
G
120V AC 60Hz 700W 1601 Jack McKay Blvd., Ennis, TX 75119
[phone] AtlasSound.com
CLASS 2 WIRING
To 70V Speakers
Graphic EQ for
System Tuning
Master
Volume
Service
Recording
Worship Music
CD Player
Pulpit MicChoir Mics
BA
Example 3

– 15 – AtlasSound.com
Specifications are subject to change without notice.
Owner’s Manual AA240 Mixer Amplifier
1601 Jack McKay Blvd. • Ennis, Texas 75119 U.S.A.
Telephone: [phone] • Fax: [phone]
Wiring the AA240
Speaker Outputs - Use 2 conductor unshielded wire of the appropriate gauge. If you are unsure about this, contact Atlas Sound Tech
Support at 1-800-876-3333. Make sure you know how many speakers you need and what tap value you intend to use.
Mic/Line Input - Use 2 conductor w/ shield for low level signals of 20–22-gauge is best. Maintain the proper polarity, + to +, – to –, and
shield to ground. For unbalanced signals, connect the (G) to the (–) terminal.
Unbalanced Inputs and Outputs - Pre-made RCA cables can be purchased from vendors to simplify interconnection to external devices.
Zone 2 Out - Use 2 conductor, 20–22-gauge, shielded is best. Terminate the shield at the input to the device if possible.
Load Consideration and Overload LED
The Overload LED will illuminate Yellow if the amp has sensed an improper load or the input signal is to high.
If the Overload is triggered the amp will not pass any signal for 10 seconds and will reset itself. If the amp continues to sense a
improper load or signal the amp will continue to cycle off if the load issue is resolved. It is highly recommended not continue for any
period of time without correcting the fault condition. If you continue to operate with the Overload Yellow LED on, damage may occur.
Refer to page 16 of manual for protect conditions.
In most situations when the LED is illuminated it means the speaker system load to the amp is lower than what the amp is rated for.
This usually is detected when you first are setting up the system. Below are a few load conditions to check for if the Protect light is on.
1. Connected to the wrong speaker terminal.
Always check the speaker terminal to the type of load you are using. Example: If you are installing a 70.7V system make sure the
wires are connected to the 70V and common (COM) terminals.
2. Too many speakers connected to the amp.
This is a very common mistake. If you are using a 240W amp and using the 70.7V speaker terminals, add up the number of speak-
ers and their wattage selections at the speaker. If they exceed 240W you must retap the speakers or remove the correct amount
speaker wattage until the wattage is 240W or less. Example: If you are using a 30W tap you can only connect 8 speakers to the
amp. If you are using the 7.5W tap, you can connect 32 speakers. If you have too many speakers on the amp it will load the amp
down, causing excessive current demand and will trigger the Protect circuit.
3. Wrong speaker tap selection.
It is also common in set up that in a 70.7V system one of the speakers is set to low impedance (8Ω) and not a 70.7V tap. This only
takes one speaker to load the amp down incorrectly.
4. Short in system.
This is common if the wire is run in metal conduit and the wire got nicked during the wire pull.
5. Speaker Level Controls.
If a L-PAD or stepped attenuator is wired wrong it can also load a system down.

AtlasSound.com – 16 –
Specifications are subject to change without notice.
Owner’s ManualAA240 Mixer Amplifier
1601 Jack McKay Blvd. • Ennis, Texas 75119 U.S.A.
Telephone: [phone] • Fax: [phone]
Measuring Speaker Loads
Below is an ipedance load chart for the AA240. When measuring the load impedance prior to connecting the load to the amplifier, the
enclosed load chart will provide you the information to determine if the load or speaker system impedance is too low for the amplifier's
rating. In every install it is always recommended to measure the load first to be sure the system was installed correctly.
Measuring a Speaker System's Impedance.
Note: It is important to only use an Audio Impedance Meter and not a conventional volt/Ωmeter.
A true audio frequency impedance meter is essential for reliable installation of background music and paging systems in residences,
offices buildings, and public areas. Avoid costly service calls and amplifier damage by verifying actual speaker system impedance prior
to operation. Unlike conventional volt/Ωmeters, which measure DC resistance, an Audio Impedance Meter unit utilizes an internal fre-
quency oscillator to measure true impedance. It may also be utilized with 25V/70.7V and 100V speaker line transformers, L-pads and
matching impedance volume controls. There are several Audio Impedance meters on the market, if you need to buy one we suggest
going to MCM Electronics or search the internet for Audio Impedance Meter.
Measuring 25V/70.7V Distributed Speaker Systems
Large distributed systems typically utilize 25.2V or 70.7V transformers (50V and 100V in Europe), to greatly ease the connection of
multiple speakers and facilitate long cable runs. These speakers are connected in parallel, as shown below, with total wattage ratings
added to calculate the overall rating of the system. Connecting this meter to a speaker arrangement such as this will provide the overall
impedance of the system. Using the following formula you can calculate the wattage. Simply put, when connected to a distributed sys-
tem, take the voltage of the system (normally 70.7V or 25.2V), squared, divided by the impedance displayed on the meter. Your answer
will be the total system wattage. This total wattage must not exceed the wattage output rating of the amplifier or damage may occur.
In this example the measurement for a 70.7V design with speakers of 10W, 30W and 60W, the system impedance would measure
close to 50Ω. Formula 70.7V x 70.7V = 4998, 4998 / 100W = 49.9Ω. If this speaker system load is connected to at least a 120W amp @
70.7V, the system will operate properly.
Note: It is always recommended to use a larger amp than needed with output power headroom of at least 25%.
AA240 Max Load Chart
Speaker Tap AA240
4Ω4Ω
25V 2.6Ω
70.7V 20Ω
100V 41Ω
(10 W)
(30 W)
(60 W)

– 17 – AtlasSound.com
Specifications are subject to change without notice.
Owner’s Manual AA240 Mixer Amplifier
1601 Jack McKay Blvd. • Ennis, Texas 75119 U.S.A.
Telephone: [phone] • Fax: [phone]
Security Covers Option
In order to prevent unauthorized operation of the AA240, optional security covers are available which take the place of the front panel
knobs. After the AA240 has been installed and is operating as desired, grasp the front panel knobs and pull straight out from the front
panel. Replace the knobs with security covers, Atlas Sound part number AAVCC-5 available in quantities of 5.
Wiring the AAVC-10K VCA Potentiometer
Atlas part number, AAVC-10K, consists of a single gang “Decora style” wall plate with a pre-mounted 10K potentiometer and knob. Use
two conductor unshielded wire connecting the pot terminals to the terminals marked “VCA” on the back of the amp.
10
010 0
0 10 On
Off
Input 6
Input 5
Input 4
Input 3
Input 2
10
0
10
0
10
+
–
0
Bass Treble
010
+
–
Input 1
Master
Power
PowerLimitPeakSignal
VCA
In/Out
Bridge
Sel
Zone 2 Out
Ω
1W 8 Ω 600
Remote
Mute
Input 2
Tr i m
Input 3
Tr i m
Input 5
Input 6
Off
On
Off
On
Off
On
Off
On
Input 2
On
Off
Line
Mic
Line
Mic
Line
Mic
Sens
Input 1
Input 2Input 3
Input 4Input 5 Phantom
On
Off
Input 6
12 3 45
300mV
100mV
67
Master
Line
Mic Mic
Tel/Line Off
On
Mute Rcv
Input 6 Input 5 Input 4 Input 3
VCA
51 2 3 4
8
Low Cut
6
Input 1
Sens
Input 1
Tr i m
Input 4
Tr i m
Input 5
Trim
Zone 2
Level
B
A
Line Out
Speaker Output 240W
Ω100V70V25V4Com
+ +
G+
R
L
Pre Out
Pwr In
Tape Out Input 6
Input 4 Input 3 Input 2 Input 1
Unswitched Outlet
120V ~60Hz
Max 500W
Outlet Breaker
125V ~4A
Push Reset
G+ G+ G+ G+
+
G
120V AC 60Hz 700W 1601 Jack McKay Blvd., Ennis, TX 75119
[phone] AtlasSound.com
CLASS 2 WIRING
Front Panel
Knob
Security Cover
or
To VCA Terminals
10k Ω

AtlasSound.com – 18 –
Specifications are subject to change without notice.
Owner’s ManualAA240 Mixer Amplifier
1601 Jack McKay Blvd. • Ennis, Texas 75119 U.S.A.
Telephone: [phone] • Fax: [phone]
AA240 Block Diagram
Limiter
TAPE OUT
PWR AMP 35W
PEAK LED
ATLAS SOUND
MODEL AA240
OUTPUT AND REDUCES INPUT LEVEL?
1 2 3 4 5 6 7
MUTE SENS
1W @ 8Ω
1.5V @ 600Ω
CHANNEL 6
COMPARING CIRCUIT MONITORS VOLTAGE
IN 1 LEVEL
ZONE 1 OUTPUT
100V
25V
4Ω
COM
SIGNAL LED
A
B
ZONE 2 OUTPUT
8 1 2 3 4 5
LINE-TEL PHANTOM
MIC PRE
TRIM
CHANNEL 2
IN 2 LEVEL
LINE PHANTOM
MIC MUTE
PRE
TRIM
CHANNEL 3
IN 3 LEVEL
LINE PHANTOM
MIC MUTE
PRE
TRIM
CHANNEL 4
IN 4 LEVEL
LINE PHANTOM
MIC MUTE
PRE
TRIM
CHANNEL 5
IN 5 LEVEL
LINE PHANTOM
MIC MUTE
PRE
TRIM
IN 6 LEVEL
100mV
300mV
MUTE
PRE
AMP IN
PRE PRE
BRIDGE
IN/OUT
SELECT/ACTIVATE
MASTER LEVEL
LINE OUT
A
B
70.7V
ZONE 2 LEVEL
VCA VCA
BASS TREBLE
FILTER
Input 6
Off
On
Off
On
Off
On
Off
On
Input 2
On
OffLine
Mic
Line
Mic
Line
Mic
Sens
Input 1Input 2Input 3Input 4Input 5 Phantom
On
Off
Input 6
1 2 3 4 5
300mV
100mV
6 7
MasterLine
Mic Mic
Tel/Line Off
On
Mute Rcv
Input 6 Input 5 Input 4 Input 3
VCA
51 2 3 48
Low Cut
6
CHANNEL 1
+
-
+
+
-
+
-
+
-
+
-
6
(OPTIONAL)
INPUT XFMR
POWER
+
FUSE
POWER SWFUSE
BREAKER AC120V AC
AC120V 60Hz
POWER TRANS
Uncontrolled - For Reference Only
1/9/2006

– 19 – AtlasSound.com
Specifications are subject to change without notice.
Owner’s Manual AA240 Mixer Amplifier
1601 Jack McKay Blvd. • Ennis, Texas 75119 U.S.A.
Telephone: [phone] • Fax: [phone]
Optional Input Transformer Installation
Contact Atlas Sound at 1-800-876-3333 for price and availability.
INPUT 1 TRANSFORMER JUMPERS
INPUT 1
OPTIONAL
TRANSFORMER
SOCKET
XFMER INXFMER BYPASS XFMER INXFMER BYPASS
(p/n AAIT-600)

AtlasSound.com – 20 –
Specifications are subject to change without notice.
Owner’s ManualAA240 Mixer Amplifier
1601 Jack McKay Blvd. • Ennis, Texas 75119 U.S.A.
Telephone: [phone] • Fax: [phone]
Specifications
Power Output Max. Average Power @ 50Hz-20kHz with .5% THD (10-80kHz filter) 4Ω, 1kHz, 240W RMS
Transformer Outputs 25V AA240 240W RMS
70.7V AA240 240W RMS
100V AA240 240W RMS
Frequency Response 50Hz – 20kHz
Distortion <1% at rated power (1kHz)
Sensitivity Input 1 Line/Tel 316mV (-10dBV) 10kΩ (600Ωwith optional transformer)
Mic .316mV~3.16mV (-50dBV~ -70dBV)
Inputs 2-5 Line 316mV (-10dBV) 10kΩ
Mic .316mV~3.16mV (-50dBV~ -70dBV)
Input 6 Line 300mV/100mV (-10dBV/-20dBV) Selectable
Outputs Main: Transformer coupled, balanced, 4Ω, 25V, 70V, and 100V
Zone 2- 8ΩUnbalanced 1W
Zone 2- 600Ω Balanced 1.5V
Signal To Noise Ratio Mic >55dB
Line >55dB
Telephone >75dB
Tone Controls Bass ±6dB @ 100Hz
Treble ±6dB @ 10kHz
Indicators Power, signal, peak limit
Power Consumption 700 Watts
Height 4.219" (107mm)
Width 16.54" (420mm)
Depth 14.06" (357mm)
Weight 27.85 lbs (12.63kg)