Bose Stereo Amplifier DXA2120 User Guide page

FreeSpace® DXA2120 DigitalMixer/Amplifier  
Owner’s Guide  
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Safety Information  
Please read this owner’s guide  
Please take the time to follow the instructions in this owner’s guide carefully. It will help you set up and operate  
your system properly and enjoy all of its advanced features. Please save this owner’s guide for future reference.  
WARNING: To reduce the risk of fire or electrical shock, do not expose the product to rain or moisture.  
WARNING: The apparatus shall not be exposed to dripping or splashing, and objects filled with liquids, such as vases,  
shall not be placed on the apparatus. As with any electronic products, use care not to spill liquids into any part of the  
system. Liquids can cause a failure and/or a fire hazard.  
The lightning flash with arrowhead symbol within an equilateral triangle alerts the user to the presence of  
uninsulated, dangerous voltage within the system enclosure that may be of sufficient magnitude to  
constitute a risk of electrical shock.  
The exclamation point within an equilateral triangle, as marked on the system, is intended to alert the  
user to the presence of important operating and maintenance instructions in this owner’s guide.  
WARNING: No naked flame sources, such as lighted candles, should be placed on the apparatus.  
CAUTION: Make no modification to the system or accessories. Unauthorized alterations may compromise safety,  
regulatory compliance, and system performance.  
CAUTION: This product shall be connected to a mains socket outlet with a protective earthing connection.  
This product conforms to the EMC Directive 89/336/EEC and to the Low Voltage  
Directive 73/23/EEC. The complete Declaration of Conformity can be found on  
www.Bose.com/static/compliance/index.html.  
Note: Where the mains plug or appliance coupler is used as the disconnect device, such disconnect device shall  
remain readily operable.  
Note: The product must be used indoors. It is neither designed nor tested for use outdoors, in recreation vehicles, or  
on boats.  
Note: Provide an earth connection before the main plug is connected to the mains.  
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Safety Information  
15. To prevent risk of fire or electric shock, avoid overloading wall  
Important safety instructions  
outlets, extension cords, or integral convenience receptacles.  
1. Read these instructions.  
16. Do not let objects or liquids enter the product – as they may  
touch dangerous voltage points or short-out parts that could result  
in a fire or electric shock.  
2. Keep these instructions – for future reference.  
3. Heed all warnings – on the product and in the owner’s guide.  
4. Follow all instructions.  
17. See product enclosure for safety related markings.  
5. Do not use this apparatus near water or moisture.  
6. Clean only with a dry cloth.  
18. No naked flame sources, such as lighted candles, should be  
placed on the apparatus.  
7. Do not block any ventilation openings. Install in accordance  
with the manufacturer’s instructions To ensure reliable opera-  
tion of the product and to protect it from overheating, put the prod-  
uct in a position and location that will not interfere with its proper  
ventilation.  
8. Do not install near any heat sources, such as radiators, heat  
registers, stoves, or other apparatus (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 wider blade or third prong are provided  
for your safety. If the provided plug does not fit in your outlet,  
consult an electrician for replacement of the obsolete outlet.  
10. Protect the power cord from being walked on or pinched, par-  
ticularly at plugs, convenience receptacles, and the point where  
they exit from the apparatus.  
Information about products that generate  
electrical noise  
If applicable, this equipment has been tested and found to com-  
ply with the limits for a Class A digital device, pursuant to Part 15  
of the FCC rules. These limits are designed to provide reasonable  
protection against harmful interference in a residential installa-  
tion. This equipment generates, uses, and can radiate radio fre-  
quency energy and, if not installed and used in accordance with  
the instructions, may cause harmful interference to radio commu-  
nications. However, this 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, you are encour-  
aged to try to correct the interference by one or more of the fol-  
lowing measures:  
11. Only use attachments/accessories specified by the  
manufacturer.  
• Reorient or relocate the receiving antenna.  
12. Use only with the cart, stand, tripod, bracket, or  
table specified by the manufacturer or sold with  
the apparatus. When a cart is used, use caution  
when moving the cart/apparatus combination to  
avoid injury from tip-over.  
• Increase the separation between the equipment and receiver.  
• Connect the equipment to an outlet on a different circuit than  
the one to which the receiver is connected.  
13. Unplug this apparatus during lightning storms or  
when unused for long periods of time – to prevent  
damage to this product.  
• Consult the dealer or an experienced radio/TV technician for  
help.  
Note: Unauthorized modification of this product could void the  
user’s authority to operate this equipment.  
14. 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 nor-  
mally, or has been dropped – Do not attempt to service this prod-  
uct yourself. Opening or removing covers may expose you to  
dangerous voltages or other hazards. Please call Bose to be referred  
to an authorized service center near you.  
This product complies with the Canadian ICES-003 Class A  
specifications.  
The information furnished in this user’s guide does not include  
all of the details of design, production, or variations of the equip-  
ment. Nor does it cover every possible situation which may arise  
during installation, operation, or maintenance.  
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Contents  
4.7 System wiring ..................................................... 12  
1.0 Introduction ..............................................5  
4.7.1 LINE 1-4 source inputs .............................. 12  
4.7.1.1 RCA connections .......................... 12  
4.7.1.2 Euroblock connections .................. 13  
4.7.2 DIRECT source input ................................. 13  
4.7.3 PAGE source input .................................... 14  
4.7.4 OUTPUT connections ............................... 14  
4.7.5 AUX output connection ............................. 15  
1.1 The Bose® FreeSpace® DXA 2120  
Digital Mixer/Amplifier ...........................................5  
1.2 Supplied with the product ....................................5  
1.3 Mixer/Amplifier accessories .................................5  
2.0 Hardware Description ..............................6  
4.8 AC POWER connection ..................................... 15  
4.8.1 Input voltage setting (120 or 220-240V) .... 15  
4.8.2 Fuse type ................................................... 15  
4.8.3 AC POWER connection ............................. 15  
2.1 Front panel with open compartment ....................6  
2.1.1 System Controls ..........................................6  
2.1.2 Control Compartment ..................................6  
2.1.3 Input Controls ..............................................6  
4.9 DC POWER connection ..................................... 15  
5.0 System Setup ..........................................16  
5.1 System setup introduction ................................. 16  
2.2 Front panel with compartment closed ..................6  
2.3 Rear panel ............................................................7  
2.3.1 Audio source inputs .....................................7  
2.3.2 Outputs ........................................................7  
2.3.3 Control input ................................................7  
2.3.4 Power ...........................................................7  
2.3.5 Communication ...........................................7  
5.2 System setup procedure .................................... 16  
5.2.1 Selecting an operation mode .................... 16  
5.2.2 Setting the options for that mode ............. 16  
5.3 Mixer Mode settings .......................................... 17  
5.4 Stereo Select Mode settings .............................. 22  
5.5 Dual Mono Select Mode settings ....................... 26  
5.6 Overview of Utility Mode settings ...................... 30  
3.0 Operation Mode Options .........................8  
3.1 Operation mode options .......................................8  
3.1.1 Mixer Mode ..................................................8  
3.1.2 Stereo Select Mode .....................................9  
3.1.3 Dual Mono Select Mode ..............................9  
6.0 User Interfaces ........................................31  
4.0 Hardware Installation .............................10  
6.1 User interface use .............................................. 31  
6.1.1 Mode user interface requirements ............ 31  
6.1.1.1 Mixer Mode user interface  
4.1 Introduction ........................................................10  
4.2 Included accessories ..........................................10  
4.3 Placement guidelines .........................................10  
4.4 Shelf mounting the chassis ................................10  
4.5 Rack mounting the chassis ................................10  
application ................................................. 31  
6.1.1.2 Stereo Select Mode  
user interface application .......................... 31  
6.1.1.3 Dual Mono Select Mode  
user interface application .......................... 31  
4.6 User interface (accessory) ..................................11  
4.6.1 User interface installation ..........................11  
4.6.1.1 Additional equipment  
7.0 Troubleshooting Table ...........................32  
7.1 Technical assistance .......................................... 32  
8.0 Reference ................................................33  
8.1 Factory Default Settings ..................................... 33  
required (not supplied) ...............................11  
4.6.1.2 Assembly .......................................11  
4.6.1.3 Recommended cable lengths ........11  
4.6.1.4 User interface connections ............11  
4.6.1.5 User interface wiring ......................12  
4.6.1.6 Detailed schematics of  
user interfaces ...........................................12  
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1.0 Introduction  
1.1 The Bose® FreeSpace® DXA 2120  
Digital Mixer/Amplifier  
1.2 Supplied with the product  
Included connectors:  
3-terminal input connectors: (4) for wiring source equipment  
to the four Mic/Line input Euroblock jacks.  
4-terminal input connectors: (2) for wiring to the Page and  
Direct input jacks.  
6-terminal input connector: (1) for wiring user interfaces to  
the Remote input jack.  
The Bose® FreeSpace® DXA 2120 Digital Mixer/Amplifier  
integrates digital signal processing with two powered output  
channels. Designed as a mixer or router for business music  
applications, it features an LCD panel and controls behind the  
front cover for easy access.  
5-terminal output connectors: (2) for wiring to the loud-  
speakers.  
3-terminal output connector: (1) for wiring to the AUX output  
jack.  
The mixer/amplifier provides six inputs, including four Mic/Line  
inputs, one Page input, and one Direct input. The Direct input  
overrides all sources playing on the output channels. Each Mic/  
Line input provides both RCA and Euroblock jacks.  
Included placement aids:  
Non-skid rubber feet: (4) for stable placement on a solid, level  
surface.  
Two output channels are wired for 120 watts at 4 ohms each. For  
70/100 volt applications, a jumper is required for proper configu-  
ration. In 70/100V applications, the two outputs will operate at  
100 watts per channel. A third output is available for an auxiliary  
line out.  
Rack ears: (2) with mounting hardware for installation in a  
rack.  
1.3 Mixer/Amplifier accessories  
Application-specific Bose accessories:  
Additional features include:  
• Bose® Volume Control User Interface  
A user interface with a volume control knob that fits into a  
standard U.S. double-gang junction box.  
Signal Mixing: In Mixer Mode, simultaneously combines up to  
four inputs for any of the three outputs.  
Signal Routing: In Dual Mono Select Mode, one or two inputs  
go to each of two outputs in different zones and can be  
remotely selected. In Stereo Select Mode, two stereo sources  
go to one output zone and can be remotely selected.  
• Bose® Volume Control with A/B Select User Interface  
A user interface that fits into a standard U.S. double-gang  
junction box. It features volume control and A/B select knobs  
for remote source selection.  
Opti-voice® Paging: Provides a smooth transition between  
music and page signals.  
Dynamic Equalization: Maintains tonal balance at all listening  
levels.  
• Bose Loudspeaker EQs: Provide equalization for Bose  
loudspeakers.  
• AGC (Automatic Gain Control): When enabled, automatically  
compensates for low-level sources (i.e., microphone with low  
sensitivity).  
Room Equalization: Allows easy adjustment of tonal balance  
in each zone.  
Communications Port: Includes an RS-232 serial port  
reserved for system updates.  
Backup power: Provides an input terminal for a +24V DC  
backup power source.  
5 of 36  
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2.0 Hardware Description  
2.1 Front panel with open compartment  
1
2
3
4
9
10  
5
7
6
8
6
GAIN knobs – Adjusts gain for OUTPUT 1, OUTPUT 2, and  
PAGE.  
2.1.1 System Controls  
1
2
3
4
5
LCD panel – Displays menu selections for configuring and  
viewing system settings.  
7
BASS and TREBLE knobs – Adjusts tonal balance for  
OUTPUT 1 and OUTPUT 2.  
Directional buttons – Navigates system menus and setting  
options shown on the LCD.  
2.1.2 Control Compartment  
8
SELECT button – Confirms selections and settings in the  
system menus.  
Enclosure door – Conceals system controls.  
POWER LED – Blue light indicates the system is on. No  
light when unit is off.  
2.1.3 Input Controls  
9
SIGNAL and CLIP LEDs – Shows signal states for  
Inputs 1-4.  
SIGNAL and CLIP LEDs – Shows signal states for  
OUTPUT 1, OUTPUT 2, PAGE, and DIRECT.  
Signal Unlit = No signal  
Clip Unlit = No clipping  
Clip Red = Clipping  
Signal Unlit = No signal  
Clip Unlit = No clipping  
Clip Red = Clipping  
Signal Green = Signal present  
Signal Green = Signal present  
10 Gain knobs – Adjusts gain for INPUT 1- INPUT 4.  
2.2 Front panel with compartment closed  
1
2
1
Door – Provides access to system controls.  
2
Power status window – Reveals Power LED.  
6 of 36  
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2.0 Hardware Description  
2.3 Rear panel  
2
4
6
1
3
5
7
8
9
10  
11  
13  
12  
14  
2.3.1 Audio source inputs  
2.3.4 Power  
1
2
3
LINE INPUTS Two unbalanced RCA audio jacks per input  
(summed to mono).  
9
BACKUP POWER – For connection to backup power  
source.  
MIC/LINE INPUTS – Balanced Euroblock input jacks. One  
per input.  
10 POWER OFF/ON – AC power switch.  
11 FUSE – 120V T6.3AL/250V or 220-240V T3.15AL/250V.  
12 AC mains line cord jack – AC line voltage input.  
MIC/LINE switch – Adjusts for the proper signal level being  
used with the four Euroblock input connectors.  
13 120V/220-240V switch – Switches between 120V and  
220-240V AC input voltage. This switch is not provided on  
100V AC input voltage models.  
(Mic connections require using the Euroblock input jacks.)  
4
5
DIRECT INPUT – Balanced override input jack.  
PAGE INPUT – Balanced audio input jack.  
2.3.5 Communication  
14 COM – RS-232 serial port is reserved for system updates.  
2.3.2 Outputs  
6
AUX OUTPUT – Line-level signal output for other amplified  
equipment.  
7
OUTPUTS 1 and 2 – Speaker connections for two powered  
outputs (70V, 100V, or 4 ohms operation).  
2.3.3 Control input  
8
REMOTE – Input jack for volume-only control and volume  
control with A/B select user interfaces.  
7 of 36  
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3.0 Operation Mode Options  
3.1.1 Mixer Mode  
3.1 Operation mode options  
Line-level sources can be connected using the RCA jacks or  
Euroblock connectors. The system sums the two RCA jacks for  
each input to mono.  
Before making connections, decide how you want the sound  
sources distributed throughout the site. This depends on whether  
the area is specified for one or two zones, the kind of coverage  
needed, and the sources to be used.  
Microphones must be connected using the Euroblock connec-  
tors. Make sure the MIC/LINE switch is set to MIC.  
The mixer/amplifier provides three different modes of operation.  
• Mixer Mode  
In Mixer Mode, the system can mix up to four mic/line inputs to  
each of the two output channels for use in one or two zones.  
• Stereo Select Mode  
In Stereo Select Mode, with up to two stereo sources  
connected and using both output channels, the system  
provides stereo sound to a single output zone. Refer to “Stereo  
Select Mode” on page 9.  
Mixer mode sources can be routed to either or both outputs, as  
shown below.  
• Dual Mono Select Mode  
In Dual Mono Select Mode, with up to two input sources  
connected to each of the two output channels, the system  
provides audio in two zones. Refer to “Dual Mono Select  
Mode” on page 9.  
Sources can be independently routed to the auxiliary output.  
In normal operation, the OUTPUT 1 and 2 gain controls are used  
to control the gains of OUTPUT 1 and 2, respectively. In this  
mode, you have the MASTERVOL LINKED option, which allows  
you to configure the OUTPUT 1 gain control to control the gains  
of OUTPUT 1 and 2 simultaneously.  
Note: With use of a user interface, the chassis output gain knob is  
disabled.  
Use of one or two volume control user interfaces is optional. For  
further detail, see “Mode user interface requirements” on  
page 31.  
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3.0 Operation Mode Options  
3.1.2 Stereo Select Mode  
3.1.3 Dual Mono Select Mode  
Line-level sources can be connected using RCA jacks or  
Euroblock connectors. To connect a stereo source to RCA jacks,  
use either the left or right RCA jack of each INPUT.  
Line-level sources can be connected using RCA jacks or  
Euroblock connectors. The system sums the two RCA jacks for  
each input to mono.  
Dual Mono Select Mode source routing is fixed, as shown below.  
Auxiliary output can be set up to track Output 1 or constant audio  
from Input 1.  
This mode supports the use of one user interface for each output  
channel using a volume control with A/B select user interface.  
Stereo Select Mode source routing is fixed, as shown below.  
Note: With use of a user interface, the chassis output gain knob is  
disabled.  
For further detail, see “Mode user interface requirements” on  
page 31.  
Auxiliary output can be set up to:  
• Play constant audio from Inputs 1 + 2 (summed to mono),  
Source 1.  
• Play constant audio from Inputs 3 + 4 (summed to mono),  
Source 2.  
Track source selected using A/B select on user interface.  
This mode supports the use of one user interface in a single zone  
using the volume control with A/B select user interface.  
Note: With use of a user interface, the chassis output gain knob is  
disabled.  
For further detail, see “Mode user interface requirements” on  
page 31.  
9 of 36  
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