BOSE FS2C FreeSpace Commercial In Ceiling Loudspeaker Instructions
- July 20, 2024
- Bose
Table of Contents
BOSE FS2C FreeSpace Commercial In Ceiling Loudspeaker Instructions
Determining Loudspeaker Quantity and Spacing
The goal is to evenly distribute loudspeakers in the room to provide consistent sound throughout. It may be helpful to sketch this out on paper. Start by creating a sketch layout of the room. Using your sketch of the room, follow the steps below to create a layout with the loudspeaker spacing that meets your coverage requirement.
A. Calculate the Loudspeaker Spacing Distance (LSD)
L = Listener Height
Seated : 3.5 ft | 1 m
Standing : 5 ft | 1.5 m
LSD = Loudspeaker Spacing Distance
M = Multiplier
LSD = (H – L) × M
| 2.25” Woofer Coverage | M(multiplier) | Models |
|---|---|---|
| Edge-to-edge | 3.46 | FS2C DM2C-LP |
| Minimum Overlap | 2.45 |
Multipliers are created from Coverage Angles (CA). These are multipliers we have found to work for most applications. For more precise results, and to adjust for obstructions, use a software design tool, such as Bose Professional Modeler, EASE, EASE Address, or EASE Evac.
Edge-to-edge coverage generally works well in fixed-location seating/standing scenarios and for installations on a tighter budget. It is appropriate for low-level background music. Minimum overlap coverage provides more consistent sound quality throughout the space and will also produce an overall louder music level. If additional loudspeakers are required beyond what is included with the Audio Pack Pro additional FS2C loudspeakers can be added to the system, however, the loudspeakers will need to be set at a lower power level.
Place the first loudspeaker at ½ LSD from any corner of the room.
The remaining loudspeakers are arranged on a square grid pastern using the
LSD. If a loudspeaker would be placed on or beyond the perimeter of the room,
delete that row/column of loudspeakers.
Calculate Loudspeaker Tap Values
The Free Space FS loudspeakers are compatible with 70-volt, 100-volt
amplifiers like the IZA 190-HZ.
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:
Power Required
Headroom
Amplifier Size
Free Space FS2C Loudspeaker Amplifier Example| Maximum Loudspeakers at Higher
Tap Settings| EQ Preset| Average SPL*
---|---|---|---
Free Space IZA 190-HZ| 5 at 16W, 10 at 8W tap| FS2C/SE/P| 87 dB at 16W, 84 dB
at 8W
- 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.
Tap Charts
Individual Loudspeaker Continuous Output Level
Note: The following tap charts assume standing ear height at 1.5 meters (5 feet) in minimum overlap spacing. Room reverberation could add as much as 4 dB system gain, which is not factored into the measurements. Designing without room gain will ensure you don’t under-plan your design, and amp attenuation is possible at the job site if you exceed the average room SPL target during measurement. Values below 70 dB are omitted, select a higher tap.
FS2C
FS2C(standing listener height)
Ceiling Height| mft| 2.4| 2.7| 3| 3.7| 4| 4.3| 5| 5.5| 6| 6.7| 8| 9.8|
| 8| 9| 10| 12| 13| 14| 16| 18| 20| 22| 26| 32
TAP| 1W| 87| 84| 82| 79| 78| 77| 75| 74| 73| 72| —| —| dB-SPL
2W| 90| 87| 85| 82| 81| 80| 78| 77| 76| 75| 73| 75
4W| 93| 90| 88| 85| 84| 83| 81| 80| 79| 78| 76| 78
8W| 96| 93| 91| 88| 87| 86| 84| 83| 82| 81| 79| 81
16W| 99| 96| 94| 91| 90| 89| 87| 86| 85| 84| 82| 84
8Ω| 99| 96| 94| 91| 90| 89| 87| 86| 85| 84| 82| 80
Graph Paper
