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1.1 The Bose
FreeSpace
®
business music system
The Bose FreeSpace E4 Series II system is an integrated four-
channel digital signal processor and 400-watt power amplifier for
70/100V business music applications.
The E4 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 E4 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, E4 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 E4 system electronics
for automated on/off control, source changes, and volume
changes according to time of day or day of week.
• Multi-Zone Paging: Allows you to initiate a page from a single
keypad to one or more of the zones being powered by the
same E4 system.
• Opti-voice
®
Paging: Provides a smooth transition between
music and page signals.
®
• Opti-source
Input Leveling: Monitors the input level of up to
four sources and continually makes adjustments to maintain a
consistent volume level between different sources.
• 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.
1.0 E4 Introduction
E4 Series II
®
13 of 80
• Serial Data Interface: RS-232 serial port for easy interfacing
to your PC
• Remote On/Off 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 E4 system
electronics distributes the power based on those needs.
The E4 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 E4 system accessories
Optional Bose accessories for the E4 system are available.
• FreeSpace E4 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 E4 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.
• FreeSpace
®
E4 System Auto Volume Interface Kit (U.S.)
(PC030101)
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 Auto Volume on/off.
• FreeSpace E4 System Auto Volume Interface Kit (Euro)
(PC030102)
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 Auto Volume on/off.
• FreeSpace E4 System Auto Volume Mic Kit (U.S.)
(PC029859)
One sensing microphone that can be mounted as is or in a
standard U.S. single-gang junction box.
• FreeSpace E4 System Auto Volume Mic Kit (Euro)
(PC029860)
One sensing microphone that can be mounted as is or in a
standard Euro single-gang junction box.
• FreeSpace E4 System Accessory Kit (U.S.) (PC030105)
Supplemental rear panel mating connectors and non-skid feet.
• FreeSpace E4 System Rack Mount Kit (PC029858)
One pair of rack ears.
• FreeSpace E4 System Page Interface Kit (U.S.) (PC030103)
A wall-mountable keypad that fits into a standard U.S. single-
gang junction box. It provides buttons for 1-4 page zone selec-
tion, all page zones selection and initiate page.
• FreeSpace E4 System Page Interface Kit (Euro) (PC030104)
A wall-mountable keypad that fits into a standard Euro single-
gang junction box. It provides buttons for 1-4 page zone selec-
tion, all page zones selection and initiate page.