Bose FreeSpace E4 Series II, Service Manual

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PRODUCT DESCRIPTION
E-4 Series II Business Music System
The Bose
®
FreeSpace
®
E-4 Series II Business Music System is an integrated four-channel
digital signal processor and 400-Watt power amplifier for 70/100V business music applications.
The E-4 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 E-4
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 E-4 system for automated on/off and source
selections 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 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 E-4 Series II system distributes the power based on those needs.
The E-4 Series II also includes an easy-to-replace memory module, which holds a design file
and the current hardware configuration.