FreeSpace
®
E4 Series II
System Electronics
PROFESSIONAL SYSTEMS DIVISION
Information subject to change without notice. pro.bose.com
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©2006 Bose Corporation, The Mountain, Framingham, MA 01701-9168 USA
CCM-003745 PC036723
Safety and Regulatory Compliance
The FreeSpace E4 Series II system complies with
UL6500 2nd edition, EN60065 and IEC60065:
1998 (6th).
Architects’ and Engineers’
Specifications
The unit shall be an integrated signal processing
and amplification system. The system shall use a
digital signal processing architecture running at
44.1 kHz sample rate. The frequency response
shall be from 20 Hz to 20 kHz,
+
-
1 dB. The
signal-to-noise ratio shall be 90 dB or greater
A-weighted.
The power amplification section shall deliver a
maximum of 400W with less than 1.0% THD.
Channel separation shall be >70 dB at 1 kHz.
The system shall consume AC power of 60W or
less at idle, 300W at maximum continuous rated
power.
The system shall perform the following
processing functions:
• Input gain
• Input leveling
• Source routing
• Paging with adjustable ducking depth, hold
and release time
• Automatic Volume control for each output zone
• Music on hold
• Three-band graphic equalization per zone
• Loudspeaker EQ for Bose
®
loudspeakers
• Output gain with Mute
• Loudspeaker protection limiting
• System diagnostics
The system shall be the Bose FreeSpace
®
E4
Series II.
Limited Warranty
The FreeSpace E4 Series II system is covered by
a five-year transferable warranty. Details of the
warranty and its coverage are included in the
FreeSpace E4 Series II Owner’s Guide.
Literature
FreeSpace E4 Series II Technical Data PC036723
FreeSpace E4 Series II Brochure PC036724
How Our Products Are Measured
1. Amplifier Power
EIA Power – With the amplifier operating in 70V
or 100V mode, a single channel is driven to
full power with the minimum load impedance.
Output power is measured using a 1 kHz sine
wave with 1% THD, as measured at the
amplifier output.
FTC Continuous – With the amplifier operating
in 70V mode, any combination of channels
are driven to full power with the minimum
load impedance. Output power is measured
using test signals between 20 Hz and 12 kHz
with 1% THD, as measured at the amplifier
output.
2. Signal-to-Noise Ratio
The output of the amplifier is connected to the rated
load impedance with a unity gain of a frequency
of 1 kHz. A dB-calibrated voltmeter is connected
to the amplifier’s output through an A-weighting
filter (in accordance with IEC 60651). A 1 kHz
signal is connected to one of the line inputs and
the level is adjusted to achieve the amplifier’s rated
output power. The signal source is removed, and the
line input is shorted. The dB-calibrated voltmeter
now reads the A-weighted output noise level.
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