Service Manual Revision History.................................................................................................106
®
4400 System ............................................................................13
2
SAFETY INFORMATION
1. Parts that have special safety characteristics are identified by the symbol on schematics
or by special notes on the parts list. Use only replacement parts that have critical characteristics
recommended by the manufacturer.
2. Make leakage current or resistance measurements to determine that exposed parts are
acceptably insulated from the supply circuit before returning the unit to the customer.
Use the following checks to perform these measurements:
A. Leakage Current Hot Check-With the unit completely reassembled, plug the AC line cord
directly into a 120V AC outlet. (Do not use an isolation transformer during this test.) Use a
leakage current tester or a metering system that complies with American National Standards
Institute (ANSI) C101.1 "Leakage Current for Appliances" and Underwriters Laboratories (UL)
UL6500 / UL60065 / IEC 60065 paragraph 9.1.1. With the unit AC switch first in the ON position
and then in OFF position, measure from a known earth ground (metal waterpipe, conduit, etc.)
to all exposed metal parts of the unit (antennas, handle bracket, metal cabinet, screwheads,
metallic overlays, control shafts, etc.), especially any exposed metal parts that offer an electrical
return path to the chassis. Any current measured must not exceed 0.5 milliamp. Reverse the
unit power cord plug in the outlet and repeat test. ANY MEASUREMENTS NOT WITHIN THE
LIMITS SPECIFIED HEREIN INDICATE A POTENTIAL SHOCK HAZARD THAT MUST BE
ELIMINATED BEFORE RETURNING THE UNIT TO THE CUSTOMER.
B. Insulation Resistance Test Cold Check-(1) Unplug the power supply and connect a jumper
wire between the two prongs of the plug. (2) Turn on the power switch of the unit. (3) Measure
the resistance with an ohmmeter between the jumpered AC plug and each exposed metallic
cabinet part on the unit. When testing 3 wire products, the resistance measured to the product
enclosure should be between 2 and infinite MOhms. Also, the resistance measured to exposed
input/output connectors should be between 4 and infinite MOhms. When testing 2 wire products, the resistance measured to exposed input/output connectors should be between 4 and
infinite MOhms. If it is not within the limits specified, there is the possibility of a shock hazard,
and the unit must be repaired and rechecked before it is returned to the customer.
CAUTION
Danger of explosion if battery is incorrectly replaced.
Replace only with the same or equivalent type.
CAUTION: The Bose® FreeSpace® 4400 Business Music System
contains no user-serviceable parts. To prevent warranty infractions,
refer servicing to warranty service stations or factory service.
PROPRIETARY INFORMATION
THIS DOCUMENT CONTAINS PROPRIETARY INFORMATION OF
BOSE CORPORATION WHICH IS BEING FURNISHED ONLY FOR
THE PURPOSE OF SERVICING THE IDENTIFIED BOSE PRODUCT
BY AN AUTHORIZED BOSE SERVICE CENTER OR OWNER OF
THE BOSE PRODUCT, AND SHALL NOT BE REPRODUCED OR
USED FOR ANY OTHER PURPOSE.
3
PRODUCT DESCRIPTION
FreeSpace® 4400 Business Music System
The Bose® FreeSpace 4400 Business Music System is an integrated four-channel digital signal
processor and 400-Watt power amplifier for 70/100V business music applications.
The FreeSpace 4400 chassis provides a total of four source inputs (two Line In, one Mic/Line
and one Mic/Line/Page) to meet the needs of most business music installations. A Music on
Hold (MOH) output is also provided for simple integration into a phone system.
As a single component, the chassis provides all of the processing and control features required
for one to four zone business music applications. These features include:
•Auto Volume: When used with the optional FreeSpace Auto Volume Sense Mic, the 4400
system dynamically controls the program level in each zone so that the audio program
material can always be heard, regardless of the background noise.
•Scheduling: Allows you to program the 4400 system for automated on/off and source
selections according to time of day or day of week.
•Opti-Voice
speech projection.
•Source Leveling: Automatically compensates for variations in source input levels.
•Dynamic Equalization: Maintains tonal balance at all listening levels.
•Room Equalization: Provides easy adjustment of tonal balance in each zone.
•Limiting: Protects loudspeakers from unwanted transient power loads.
•Signal Router: Meets the demands of most four-zone systems, allowing for any input signal
to be routed to any of the amplifier outputs.
•RS-232 Connection: Provides easy interfacing to your PC.
•Contact Closure Input: Allows remote power sequencing.
The integrated 400-Watt power amplifier features a patented power-sharing technology which
allocates power to each output.
For example, if you have a two-zone system that requires 5 Watts in zone 1 and 395 Watts in
zone 2, the FreeSpace 4400 system distributes the power based on those needs.
®
Paging: Provides the appropriate sound level regardless of variations in
The 4400 also includes an easy-to-replace memory module, which holds a design file and the
current hardware configuration.
WARRANTY
The Bose FreeSpace 4400 Business Music System is covered by a limited 5-year transferable
warranty.
4
SPECIFICATIONS
Audio InputSource 1Unbalanced RCA, shell grounded through a 301 Ohm resistor
Connectors:Source 2Unbalanced RCA, shell grounded through a 301 Ohm resistor
PageBalanced 4 pin Beau style: +, -, ground and contact closure in
Aux/Mic/Line 3 pin Beau style, +, - and ground
Mic 1-43 pin Beau style, +, - and ground
Direct In4 pin Beau style, +, -, ground, and contact closure in
Audio Output
Connectors:Line out4 pin Beau style, +, -, ground, and contact closure in
MOH out2 pin Beau style, + and Ground
Amp 1-42 pin, Beau style, + and -
Control Connectors:Remote 1-4RJ-45, 8 pin, ground shell
Standby In2 pin Beau style, contact closure in and ground
Dimensions:5.25"H x 16.5"W x 15.5"D (13.3 x 43.8 x 39.4 cm)
Weight:Unpackaged: 30 lbs (13.6 kg)
Shipping:41 lb (18.6 Kg)
AC Mains input:IEC standard User selectable100/120 or 220/240V
3 pin50/60 Hz
receptacle300 Watts maximum
Overall Performance
NominalLimitsConditions
Gain:0 dB+1 dBAt 1 kHz; input gain set to nominal 0 dB
Dynamic range:100 dB>/= 96 dBMeasured with ADC/DAC full scale mapped to
+17 dBV; this is THD +N measured at FS-60,
through A-weighting filter, and expressed in dB
below full scale
THD+N:.05%.1%At +10 Vrms output, for signal frequencies from
30 Hz to 20 kHz
Crosstalk at 1 kHz:-80 dB</= -70 dBTerminate unused input terminals with
100 Ohm balanced-connected resistors
Crosstalk at 10 kHz:-60 dB</= -50 dBTerminate unused input terminals with
100 Ohm balanced-connected resistors
Frequency response:30 - 20 kHz+3 dBReference 1 kHz, measured at 0 dBV input
Output noise:-70 dBV</= -65 dBVChannel noise measured through an
A -weighting filter. Gain structure set to deliver
rated power and expressed in dBV
5
SPECIFICATIONS
Line Input Source 1 and 2
NominalLimitsConditions
Source impedance:200 Ohms10 to 2k Ohm Frequency response specification maintained
Gain, all settings:20 dB to+/-1 dB1 kHz, 50 Ohm source
-20 dB
Maximum input level:+17 dBV>/= +17 dBVTHD+N </= 0.3%, 30-20 kHz, 0 dB gain
THD+N:.001%.01%At +10 dBV output, 1 kHz, 20 dB gain
Crosstalk at 1 kHz:-90 dB</= -80 dB
Crosstalk at 10 kHz:-70 dB</= -60 dB
Frequency response:30 to 20 kHz+/-1.5 dBReference 1 kHz, measured at 20 dB gain
and with 0 dBV output
Page and Aux/Mic Inputs
NominalLimitsConditions
Source impedance:200 Ohms10 to 2k Ohm Frequency response specification maintained
Gain, all settings:20 dB to+/-1 dB1 kHz, 50 Ohm source
-20 dB
Maximum input level:+17 dBV>/= 10 dBVTHD+N </= 0.3%, 20-20 kHz, 0 dB gain
THD+N:.001%.01%At +10 dBV output, 1 kHz, 60 dB gain
Crosstalk at 1 kHz:-90 dB</= -80 dB
Crosstalk at 10 kHz:-70 dB</= -60 dB
Frequency response:30 Hz to+0/-0.5 dBReference 1 kHz, measured at 60 dB gain and
20 kHzwith 0 dBV output
Sense Mic inputs
NominalLimitsConditions
Source impedance:200 Ohms10 to 2k Ohm Frequency response specification maintained
codec FS:+20 dBV
Gain, all settings:-60 dB to+/-1 dB1 kHz, 50 Ohm source
+20 dB
7
SPECIFICATIONS
Sense Mic inputs (continued)
NominalLimitsConditions
Maximum input level:+10 dBV>/= 7 dBVTHD+N </= 0.3%, 20-20 kHz, 0 dB gain
THD+N:-84 dB</= -80 dBAt +10 dBV output, 1 kHz, 60 dB gain
Crosstalk at 1 kHz:-90 dB</= -80 dB
Crossalk at 10 kHz:-70 dB</= -60 dB
Frequency response:20 Hz to+0/-0.5 dBReference 1 kHz, measured at 60 dB
gain and 20 kHz with 0 dBV output
Direct Input
NominalLimitsConditions
Source impedance:200 Ohms10 to 2k Ohm Frequency response specification maintained
with sources over this range
Input impedance
differential:+/> 10kOhms +/-20% At 1 kHz
CMRR referred
to output:92 dB>/= 60 dB At 1 kHz, 20 dB gain, 200 Ohm source
Gain:0 dB+/-1 dBFrom input connector to amplifier input stage
Maximum input level:+17 dBV>/= +17 dBVTHD+N </= 0.3%, 30-20 kHz, 0 dB gain
THD+N:.001%.01%At +10 dBV output, 1 kHz, 20 dB gain
Crosstalk at 1 kHz:-90 dB</= -80 dB
Crosstalk at 10 kHz:-70 dB</= -60 dB
Frequency response:30 Hz to+0/-0.5 dBReference 1 kHz, measured at 20 dB gain and
20 kHzwith 0 dBV output
Line Outputs
NominalLimitsConditions
Output impedance:200 Ohms+/-1%Impedance at 1 kHz, each output
terminal
Maximum output level: +17 dBV>/= +17 dBV1 kHz, THD less than 0.1%, load 10 k Ohm,
differential
8
SPECIFICATIONS
Line Outputs (continued)
NominalLimitsConditions
CMRR referred
to output:92 dB>/= 60 dBAt 1 kHz, 20 dB gain, 200 Ohm source
impedance
Output noise:-90 dBV</= -85 dBVA-weighted, set for 0 dB gain
THD+N:.001%.01%At +10 dBV output, 1 kHz, 20 dB gain
Crosstalk at 1 kHz:-90 dB</= -80 dBSet for 0 dB gain, no limiting, terminate the
unused input with a 50 Ohm resistor
Crosstalk at 10 kHz:-70 dB</= -60 dB
Frequency response:30 Hz to+0/-1.0 dBReference 1 kHz, measured at 20 dB gain and
20 kHzwith 0 dBV output
Turn on/off pop:10 mV peak</= 50 mVpk As monitored by a listener, must be inaudible at
full gain using a Model 32 loudspeaker tapped
at 32W, with the unit set for no EQ and the
loudspeaker 3 feet from listener
Music on Hold (MOH)
NominalLimitsConditions
Output impedance:400 Ohms+/-1%Impedance at 1 kHz
Maximum output level: +17 dBV>/= +17 dBV1 kHz, THD less than 0.1%, load 10k Ohm,
differential
Output noise:-90 dBV</= -85 dBVA-weighted, set for 0 dB gain
THD+N:.001%.01%At +17 dBV output, 1 kHz, 0 dB gain
Crosstalk at 1 kHz:-90 dB</= -80 dBSet for 0 dB gain, no limiting, terminate the
unused input with a 50 Ohm resistor
Crosstalk at 10 kHz:-70 dB</= -60 dB
Frequency response:20 Hz to+0/-1.0 dBReference 1 kHz, measured at 0 dB gain and
15 kHzwith 0 dB output
Turn on/off pop:10 mV peak</= 50 mVpk As monitored by a listener, must be inaudible at
full gain using a Model 32 loudspeaker tapped
at 32W, with the unit set for no EQ and the
loudspeaker 3 feet from listener
9
SPECIFICATIONS
Power Amplifier
NominalLimitsConditions
Power bandwidth:30 Hz to1% THDLoaded at 25 Ohms
20 kHz
Frequency response:30 Hz to+/-3 dBOutput voltage of 10 Vrms over a load
20 kHzimpedance of 12.5 Ohms to 1000 Ohms
THD+N at 70.7 Vrms,.05%.1%30 Hz to 20 kHz, 25 Ohm load, A weighted
200W:
THD+N at 70.7 Vrms, .5%1 %7 kHz, 12.5 Ohm load, A weighted
400W:
THD+N at 100 Vrms, .05%.1%30 Hz to 20 kHz, 25 Ohm load, A weighted
200W:
THD+N at 100 Vrms, .5%1%7 kHz, 12.5 Ohm load, A weighted
400W:
Sensitivity at 70V:11 dBV+/-1 dBV
Sensitivity at 100V:14 dBV+/-1 dBV
Gain:26 dB+/-0.5 dB
Output noise:-70 dBV-65 dBVA-weighted with a 20 kHz filter
Crosstalk at 1 kHz:-90 dB</= -80 dBSet for 0 dB gain, no limiting, terminate the
unused input with a 50 Ohm resistor
Crosstalk at 10 kHz:-70 dB</= -60 dB
Turn on/off pop:10 mV peak</= 50 mVpk As monitored by a listener, must be inaudible at
full gain using a Model 32 loudspeaker tapped
at 32W, with the unit set for no EQ and the
loudspeaker 3 feet from listener
10
ELECTROSTATIC DISCHARGE SENSITIVE (ESDS)
Description Bose® Product Code
DEVICE HANDLING
This unit contains ESDS devices. We recommend the following precautions when repairing,
replacing or transporting ESDS devices:
• Perform work at an electrically grounded work station.
• Wear wrist straps that connect to the station or heel straps that connect to conductive
floor mats.
• Avoid touching the leads or contacts of ESDS devices or PC boards even if properly
grounded. Handle boards by the edges only.
• Transport or store ESDS devices in ESD protective bags, bins, or totes. Do not insert
unprotected devices into materials such as plastic, polystyrene foam, clear plastic bags,
bubble wrap or plastic trays.
PART LIST NOTES
1. This part is not normally available from Customer Service. Approval from the Field Service
Manager is required before ordering.
2. The individual parts located on the PCBs are listed in the Electrical Part List.
3. This part is critical for safety purposes. Failure to use a substitute replacement with the
same safety characteristics as the recommended replacement part might create shock, fire
and/or other hazards.
4. This part is referenced for informational purposes only. It is not stocked as a repair part. Refer
to the next higher assembly for a replacement part.
PRODUCT VARIATIONS
FREESPACE® 4400 AMPLIFIER, 120V, US/CAN
FREESPACE 4400 AMPLIFIER, 230V, EURO
FREESPACE 4400 AMPLIFIER, 100V, JAPAN
FREESPACE 4400 AMPLIFIER, 230V, UK
FREESPACE 4400 AMPLIFIER, 240V, AUS
042346
042347
042348
042349
042350
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ACCESSORIES
Optional Bose® accessories for the FreeSpace® 4400 system are available.
• FreeSpace 4400 System AVM 1-Zone
User Interface (PC 042351) A wall-mountable keypad that fits into a standard doublegang junction box. It provides buttons for
volume up/down control, 1-3 source selection, and mute or Auto Vol-ume on/off controls for a single zone.
• FreeSpace 4400 System AVM 2-Zone
User Interface (PC 042352) A wall-mountable keypad that fits into a standard doublegang junction box. It provides buttons for
volume up/down control, 1-3 source selection, and mute or Auto Volume on/off controls for two zones.
FreeSpace
Select LINE 1
input source
Select LINE 2
input source
Select MIC/
LINE 3 input
source
FreeSpace
Select LINE 1
input source
Select LINE 2
input source
Select MIC/
LINE 3 input
source
®
AVM 1-Zone User Interface
MUTE /
AUTO VOL
®
AVM 2-Zone User Interface
SOURCE VOLUME SOURCE VOLUME
MUTE /
AUTO VO L
MUTE /
AUTO VO L
Volume up
(2 dB steps)
Volume down
(2 dB steps)
Mute
or
Auto volume
on/off
Volume up
(2 dB steps)
Volume down
(2 dB steps)
Mute
or
Auto volume
on/off
• FreeSpace 4400 System Page User
Interface (PC 042353) A wall-mount able
keypad that fits into a standard double-gang
junction box. It provides buttons for 1-4 page
zone selection, all page zones selection and
initiate page.
• FreeSpace 4400 System Auto Volume
Mic Kit (U.S.) (PC 042354) One sensing
microphone that can be mounted as is or in
a standard U.S. single-gang junction box.
• FreeSpace 4400 System Auto Volume
Mic Kit (Euro) (PC 042355) One sensing
microphone that can be mounted as is or in
a standard Euro single-gang junction box.
Zone A
controls
Page User Interface
Select paging
zone #1
Select paging
zone #3
Select all
paging zones
FreeSpace® 4400 System Auto Volume Mic Kit
[PC042354 (U.S.), PC042355 (Euro)]
Wall plate-microphone
assembly
Zone B
controls
Paint plug
(2) #6-32 (3 mm) screws
Select paging
zone #2
Select paging
zone #4
Initiate a page
(2) Wire nuts
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PACKAGING PART LIST
Item
Description Bose® Part
Vendor Part
Qty. Note
FreeSpace® 4400 System Packaging View (see Figure 1)
CARTON
BRACKET, RACK EAR
POLYBAG, 04x5x9’
POLYBAG, 04x5x6’
SCREW, MACHINE, FLAT-CS
FOOT, RUBBER
LABEL, VOLTAGE SELE CT
2-TERMINAL I NPU T CONN
3-TERMINAL I NPU T CONN
4-TERMINAL I NPU T CONN
2-TERMINAL OUTPUT CONN
4 AC POWER CORD, 120V, US/CA N
AC POWER CORD, 230V , EURO
AC POWER CORD, 100V , JAPAN
AC POWER CORD, 230V , UK
AC POWER CORD, 240V , AUS
5 POLY BAG, 10x14’ - 1497-4122+0 1 4
6 DOCUMENT PACK, INCLUDES:
MANUAL
POLYBAG FOR MANUAL
FS 4400 SOFTWARE CD
QUICKSTART GUIDE
7 POLYBAG FOR UNIT - 1497-8012+0 1 4
8 FREESPACE 4400 AMPLIFIER REF - 1