User Manual

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Design Worksheet
Step 5: Calculate Required Amplifier Size
All FreeSpace FS, DesignMax, and EdgeMax loudspeakers are compatible with 70-volt, 100-volt, and low-
impedance amplifiers.
Use the Tap Charts to determine which loudspeaker tap is required for this design
A. Locate the loudspeaker tap chart and find the column for mounting height for this design.
B. Follow the column to the desired maximum SPL.
C. Follow the row across the chart to determine the required loudspeaker tap.
D. Calculate the required amplifier power:
× =
Number of Loudspeakers Required Required Loudspeaker Tap Power Required
E. Calculate the required amplifier size:
× 1.10 =
Power Required Headroom Amplifier Size
Amplifiers: Example Amplifier Configurations
Modern amplifiers come in a variety of channel counts and configuration options to allow for dierent output
configurations, zoning options, and varying loudspeaker quantities. A properly optimized system may only
need a low 1- or 2-watt tap setting to achieve 70 dB in a typical room. The below example lists how many
FS2C loudspeakers can be handled at the loudspeaker’s highest 70/100V tap setting.
FreeSpace FS2C Loudspeaker Maximum Loudspeakers at Higher Tap Settings EQ Preset Average SPL*
Amplifier Example
FreeSpace IZA 190-HZ 5 at 16W, 10 at 8W tap FS2C/SE/P
87 dB at 16W, 84 dB at 8W
FreeSpace IZA 2120-HZ 5 at 16W, 13 at 8W FS2C/SE/P
PowerShare PS404D 22 at 16W, 45 at 8W FS2C
PowerSpace P4150+ 8 at 16W, 17 at 8W FS2C
* 3 meter (10 foot) ceiling height room with edge-to-edge density, standing listener, 12 dB crest factor of pink
noise/compressed music, direct-field, no room gain.
SmartBass: Application of SmartBass processing
If your design is using a PowerSpace+ amplifier; or your design utilizes a dedicated Bose DSP, such as the
Commercial Sound Processor CSP models; or any of the ControlSpace ESP or EX models; you have the option
of applying SmartBass to your loudspeaker output channel. This uses Bose EQ presets, dynamic EQ, and
excursion limiting tuned to each model and room calibration. This will prevent lower background-level music
from sounding thin, but also ensures the sound is consistent at various SPL levels. At louder levels, SmartBass
also allows for more musical limiting than traditional voltage limiters.