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1.0 Introduction
1.1 The Bose
®
FreeSpace
®
E-4 business
music system
The Bose FreeSpace E-4 system is an integrated four-channel
digital signal processor and 400-watt power amplifier for 70/100V
business music applications.
The E-4 system has a total of four source inputs, including two
Line In, one Mic/Line and one Mic/Page/Line, to provide the
inputs needed for most business music installations. The system
also has a direct input which can override the sources playing on
all four output channels.
The E-4 system has four amplifier output channels which can be
configured for different zones. A Music on Hold output is also
provided for simple integration into a phone system.
In a single chassis, it provides all of the processing and control
features required for one-to-four zone business music applica
-
tions. These features include:
• Auto Volume: When used with the optional FreeSpace system
Auto Volume Sense Mic, E-4 system electronics dynamically
control the program level in each zone so your customers can
always hear it, regardless of the background noise
• Scheduling: Allows you to program the E-4 system electronics
for automated on/off control, source changes, and volume
changes according to time of day or day of week
• Opti-Voice
®
Paging: Provides the appropriate sound level
regardless of variations in 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 bal-
ance in each zone
• Signal Routing: Meets the demands of most four-zone sys-
tems, allowing for an input source to be routed to any of the
four amplifier outputs
• Serial Data Interface: RS-232 serial port for easy interfacing
to your PC
• Contact Closure Input: Accepts a remote STANDBY switch
The integrated 400-watt power amplifier features a patented
power-sharing technology which dynamically 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 E-4 system
electronics distributes the power based on those needs.
The E-4 also includes an easy-to-replace memory module, which
holds the system configuration settings and design file uploaded
by the FreeSpace
Installer™ software (see page 14).
1.2 E-4 system accessories
Optional Bose accessories for the E-4 system are available.
• FreeSpace E-4 System User Interface Kit (U.S.) (PC029856)
A wall-mountable keypad that fits into a standard U.S. single-
gang junction box. It provides buttons for volume up/down
control, 1-3 source selection, and mute.
• FreeSpace E-4 System User Interface Kit (Euro) (PC029857)
A wall-mountable keypad that fits into a standard Euro single-
gang junction box. It provides buttons for volume up/down
control, 1-3 source selection, and mute.
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