Overview
This application note covers the basic concepts for
the use of the Freespace 3 system in business music
applications.
The Freespace 3 system is ideally suited to back-
ground and foreground music applications with
ceiling heights between 8 and 16ft (2.4 to 5m).
The 2.25 inch driver used in the Freespace 3 system
provides more consistent coverage in low ceiling
applications, compared to other loudspeakers, and
the Acoustimass
bass module provides deep, rich
®
bass that appears to fill the room. The Freespace
3 system is compatible with 70V, 100V and 8 Ohm
amplifiers, and is capable of delivering up to 95dB
in a typical application with a 12ft (3.5m), ceiling
height.
All system designs begin with a set of requirements.
The system requirements can be as simple as "it has
to sound great," or as detailed as "it must have an
output level of 100 dB
sPL
lenge is to gather the right set of requirements and
convert them into a set of design criteria to use in
creating your design.
The three key requirements that you need to identi-
fy in order to deliver the right business music sound
system are:
Loudness What sound pressure level is required
for this application?
Response What bandwidth is required for the
type of program material that will be used?
CoveRage How consistent must the sound be
across the entire coverage area?
Bose Professional systems Division
". in either case, the chal-
FreeSpace
Prod uct Specifications
Frequency Range
Long Term Power Handling
Sensitivity
Impedance
Maximum Acoustic Output
Dispersion
each of these requirements can be easily converted
into a specification that we can use to create our
system design. if we understand the customer's
needs in these three areas, we can deliver a design
that will, at a minimum, meet their needs, and at
best exceed their expectations.
For the purposes of this application note, we will
assume that you are familiar with the system
requirements for a business music system and are
ready to focus on the creation of a loudspeaker
layout using the Freespace 3 system.
Design Guidelines
sPL
When creating a design that uses the Freespace 3
system, you should consider the following:
• Recommended mounting height for Satellites is
between 8 and 16ft (2.4 and 4.8m).
• One Satellite should always be placed near the
bass module to further reduce localization.
• Do not place bass modules along the center line
of the room; offset bass modules from the center
line using a staggered layout.
• Maximum SPL for a typical application is between
85 and 90dB
.
sPL
• Always add 25% headroom to your amplifier to
accommodate various types of program material.
3 Flush System
®
50Hz – 16kHz ± 3dB
100 watts continuous (8 Ohm)
82 dB-SPL @ 1W/1m (pink noise)
6 Ohm
102 dB-SPL @ 1m (pink noise)
170° Conical (Satellite)
Omni-directional (bass)
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