BOSE DM8S Surface-Mount Loudspeakers Instruction Manual
- June 9, 2024
- Bose
Table of Contents
DM8S Surface-mount Loudspeakers
Design Guide
Overview
Introduction
Using this design guide, you will be able to create designs for applications
that utilize surface-mount loudspeakers. We offer additional design guides for
pendant-mount and in-ceiling loudspeakers, as well as dedicated design guides
for EdgeMax and FreeSpace 3 sub-satellite systems. To learn more about our
loudspeakers and technology capabilities, as well as access additional
trainings and tutorials, visit
proedu.Bose.com/learn.
System Design Resources
In addition to this guide, we offer the following tools at PRO.BOSE.COM on the
software and individual loudspeaker product pages:
- Bose Modeler: advanced acoustical design simulation tool, with direct and reflected energy, and Speech Transmission Index (STI). Free at pro.Bose.com/modeler
- Bose Business Music System Designer: Web-based auto-loudspeaker layout tool. Free at pro.Bose.com/BMSD
- EASE .gll files: for use in the AFMG EASE application, and the EASE GLL Viewer application. EASE allows the simulation of reverberation times, speech intelligibility, and other acoustical parameters. EASE is a paid download. EASE GLL Viewer is free.
- EASE Address files: for use in the AFMG EASE Address (2D tool, direct field coverage) or EASE Evac. EASE Address is free.
- BIM files: includes the Revit format. Revit is a paid download.
Overview
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 play background-level music at 5 dB above the ambient noise level of
the restaurant’s main dining room, which is 65 dB.” The challenge is to gather
the right set of requirements, and then turn them into a set of criteria that
you can use to create your design. It is important to remember that you are
the designer and should use your own intuition and decision skills when
planning a project in addition to calculations. Applications with mounting
heights up to 10 meters (32 feet) are supported through the surface-mount
loudspeaker models listed in this guide.
There are four key requirements that need to be identified to deliver the
right system:
Loudness: What sound pressure level (SPL) is required for this
application?
Mounting Height: What loudspeakers will work best for my planned mounting
height?
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?
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 four 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 design guide, we will assume that you are familiar
with the system requirements for a commercial audio system and are ready to
focus on loudspeaker selection, creation of a loudspeaker layout, and defining
the necessary amplifier power needed to power the design.
Design Guidelines
When creating a design, you should consider the following:
- Mounting Height
- Maximum SPL for the application (for example 70 dB-SPL, Z-weighted)
Design Worksheet
Use the following worksheet to create a design using Bose Professional
loudspeakers.
Choosing a Model
Step 1: Loudness
Maximum SPL Capability
Confirm that your chosen loudspeaker model will meet your loudness
requirement. Find your mounting height and follow the column down until you
reach your desired maximum continuous output level. Models with a higher
sensitivity and higher tap settings will be able to play at higher levels.
Individual model tap charts are available at the end of this document.
Example: For a mounting height of 5 meters (16 feet) in a project that
requires 90 dB, you would choose FS4SE.
Surface-mount Models: Maximum Continuous Output Level
Mounting Height|
m
| 2.4| 2.7| 3| 3.7| 4| 4.3| 5| 5.5| 6| 6.7| 8| 9.8|
|
ft
| 8| 9| 10| 12| 13| 14| 16| 18| 20| 22| 26| 32
DM3SE| 25W tap| 97| 94| 93| 90| 89| 88| 86| 84| 83| 82| 80| 78| dB-SPL
FS2SE| 16W| 98| 96| 94| 91| 90| 89| 87| 85| 84| 83| 81| 79
FS4SE| 40W| 102| 100| 98| 95| 94| 93| 91| 89| 88| 87| 85| 83
DM5SE| 50W| 103| 100| 99| 96| 95| 94| 92| 90| 89| 88| 86| 84
DM6SE| 80W| 106| 104| 102| 99| 98| 97| 95| 93| 92| 91| 89| 87
8Ώ| 107| 104| 103| 100| 99| 98| 96| 94| 93| 92| 90| 88
DM8S| 80W| 110| 107| 102| 99| 98| 97| 95| 93| 92| 91| 89| 87
8Ώ| 112| 109| 107| 104| 103| 102| 101| 99| 98| 97| 95| 93
Note: The above table assumes standing ear height at 1.5 meters (5 feet),
in standard-spacing (minimum overlap) configuration. Room reverberation could
add as much as 4 dB system gain, which is not factored into the measurements
above. Use of the transformer on 70/100V systems will introduce an insertion
loss of 1 to 2 dB.
Step 2: Mounting Height
Average Coverage and Woofer Sizes
Smaller woofer models have wider average coverage and provide better results
at low mounting heights.
Larger woofer models with narrower average coverage angles are better suited
for higher mounting heights.
Choose the models that will work with your mounting heights and rule out the
other models.
Design Worksheet
Woofer Size| Model| Sensitivity (dB)| Highest Tap /
Power Handling| Recommended Mounting Heights
---|---|---|---|---
2″–4″| FS2SE| 87| 16W| 2.5 m–6.1 m (8’–20′)
DM3SE| 86| 25W
FS4SE| 89| 40W
5″–8″| DM5SE| 89| 50W| 3 m–10 m (10’–32′)
DM6SE (70/100V)| 90| 80W
DM6SE (8Ώ)| 100W
DM8S (70/100V)| 93| 80W
DM8S (8Ώ)| 125W
Step 3: Response
Confirm that the chosen loudspeaker will meet your low frequency response
requirement.
Vocal-range| Low Frequency
(–10 dB)| | Full-range| Low Frequency
(–10 dB)| | Extended- range| Low Frequency
(–10 dB)
---|---|---|---|---|---|---|---
FS2SE| 83 Hz| FS4SE| 70 Hz| FreeSpace 3 system| 40 Hz
DM3SE| 75 Hz| DM5SE
DM6SE
DM8S| 65 Hz
59 Hz
52 Hz| Any vocal- range or full-range loudspeaker combined with
DM10S-SUB subwoofer| 35 Hz
Step 4: Coverage
Determining Loudspeaker Quantity and Spacing
The goal is to fill a rectangle-shaped room with coverage circles at your
desired density. Using the graph paper on the last page, create 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. Calculators or software can simplify this process. Medium-sized
or larger distributed installed systems for background music or voice
typically have four or more surface-mount loudspeakers in a room. Use
Loudspeaker Spacing Distance (LSD) for small rooms that only need one.
For small rooms such as bathrooms, you may only need one or two loudspeakers
to cover the room; look at LSD
A. Calculate the Loudspeaker Spacing Distance (LSD)
We have found the following LSDs work for most applications. For more precise
results, and to adjust for obstructions, use Bose Modeler, EASE, EASE Address,
EASE Evac, or another calculator.
Note: For a fast average, start with 15 meters (44 feet) edge-to-edge, 10
meters (32 feet) minimum overlap, 8 meters (26 feet) center-to-center for LSD.
Loudspeaker Spacing Distance (LSD)
Mounting Height| Listener Position| Standing 5 ft | 1.5 m|
Sitting 3.5 ft | 1 m
ft| m| Recommended
Downward Pitch| Density| FS2SE
DM3SE
FS4SE| DM5SE
DM6SE
DM8S| FS2SE
DM3SE
FS4SE| DM5SE
DM6SE
DM8S
| ft| m| ft| m| ft| m| ft| m
8| 2.4| 0°| Edge-to-edge| 15| 5| 16| 5| 24| 7| 22| 7
Minimum Overlap| 10| 3| 10| 3| 16| 5| 14| 4
Center-to-center| 8| 2| 7| 2| 9| 3| 12| 4
10| 3.0| 0°| Edge-to-edge| 26| 8| 24| 7| 32| 10| 32| 10
Minimum Overlap| 18| 5| 16| 5| 22| 7| 20| 6
Center-to-center| 13| 4| 11| 3| 15| 5| 16| 5
12| 3.7| –15°| Edge-to-edge| 34| 10| 30| 9| 40| 12| 35| 11
Minimum Overlap| 21| 6| 20| 6| 26| 8| 24| 7
Center-to-center| 17| 5| 15| 5| 19| 6| 17| 5
14| 4.3| –15°| Edge-to-edge| 42| 13| 38| 12| 46| 14| 43| 13
Minimum Overlap| 28| 9| 24| 7| 29| 9| 30| 9
Center-to-center| 21| 6| 17| 5| 23| 7| 23| 7
15| 4.6| –30°| Edge-to-edge| 42| 13| 36| 11| 46| 14| 40| 12
Minimum Overlap| 28| 9| 24| 7| 30| 9| 28| 9
Center-to-center| 23| 7| 19| 6| 25| 8| 23| 7
16| 4.9| –30°| Edge-to-edge| 46| 14| 40| 12| 50| 15| 46| 14
Minimum Overlap| 28| 9| 28| 9| 32| 10| 30| 9
Center-to-center| 23| 7| 21| 6| 25| 8| 25| 8
18| 5.5| –45°| Edge-to-edge| 48| 15| 42| 13| 52| 16| 46| 14
Minimum Overlap| 32| 10| 30| 9| 33| 10| 32| 10
Center-to-center| 25| 8| 23| 7| 29| 9| 25| 8
20| 6.1| –45°| Edge-to-edge| 52| 16| 48| 15| 55| 18| 52| 16
Minimum Overlap| 33| 10| 34| 10| 39| 12| 36| 11
Center-to-center| 27| 8| 28| 9| 32| 10| 29| 9
22| 6.7| –45°| Edge-to-edge| 55| 18| 54| 16| 55| 20| 55| 18
Minimum Overlap| 41| 12| 36| 11| 46| 14| 40| 12
Center-to-center| 33| 10| 31| 9| 35| 11| 33| 10
24| 7.3| –45°| Edge-to-edge| 55| 20| 55| 18| 55| 23| 55| 20
Minimum Overlap| 43| 13| 42| 13| 50| 15| 44| 13
Center-to-center| 37| 11| 35| 11| 39| 12| 35| 11
26| 7.9| –45°| Edge-to-edge| 55| 23| 55| 20| 55| 24| 55| 22
Minimum Overlap| 44| 13| 44| 13| 52| 16| 50| 15
Center-to-center| 37| 11| 39| 12| 43| 13| 41| 12
28| 8.5| –45°| Edge-to-edge| 55| 23| 55| 22| 55| 24| 55| 23
Minimum Overlap| 44| 13| 50| 15| 55| 17| 53| 16
Center-to-center| 37| 11| 41| 12| 44| 13| 41| 12
Edge-to-edge coverage can provide fidelity in fixed-location seating/standing
and can generally work well for installations on a budget. It also works well
for ambient-level and low-level background music. Center to-center
installations will have higher density and can accommodate people listening in
many different positions and moving floor plans due to uniform coverage. They
will also have fewer dead zones. Minimum overlap (or center-to-center) may
also be needed if critical communication is happening over the system. Bose
Modeler or EASE Evac can help with speech intelligibility evaluation.
B. Place the first loudspeaker at ½ LSD from any corner of the room.
Continue to place loudspeakers along the wall at LSD. Supported room width can
be up to 2× LSD, assuming loudspeakers are facing in from each opposing wall
as shown.
C. After the last loudspeaker is placed, center the loudspeakers in that
row to create new offset distances out from each corner, which may be unique
from ½ LSD.
Subwoofers: Quantity and Placement of Subwoofers
The number of subwoofers to use, where to position them, and how loud to set
them can vary depending on the individual situation. Details such as
placement, boundary loading, room size, coupling quantity of multiple
loudspeakers to subwoofers, type of music, type of activity, budget, and the
expectations of the listeners should all be considered. The following
guidelines are general rules to follow.
- Add one subwoofer for every group of four vocal- or full-range loudspeakers.
- Subwoofer spacing should be as far apart as is practical. 12.2 meters (40 feet) or greater subwoofer-to subwoofer spacing distance within the same zone is desirable.
- When the suggested subwoofer count is two within a single zone, it may be preferable to use either one in a corner to avoid audible interference; or increase the count to three, which creates more audible interference locations but limits them to smaller sizes where the reverberant field (added room reflections) tends to mask them.
- Placing a ceiling subwoofer within 0.9 meters (3 feet) of a wall increases its output by 3 dB. Placing it within 0.9 meters (3 feet) of a corner increases its output by another 3 dB (6 dB total) and also reduces reflections that can create audible interference (bass cancellations) in the listening area.
- Listening positions located below the subwoofer should be supported by a nearby vocal- or full-range loudspeaker to provide better tonal balance in the low-frequency pressure zone.
Step 5: Calculate Required Amplifier Size
All FreeSpace FS and DesignMax 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:
Amplifiers: Example Amplifier
Configurations
Modern amplifiers come in a variety of channel counts and configuration
options to allow for different 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 FS2SE loudspeakers can be handled at the loudspeaker’s
highest 70/100V tap setting.
FreeSpace FS2SE Loudspeaker
Amplifier Example| Maximum Loudspeakers at Higher Tap Settings|
EQ Preset
---|---|---
FreeSpace IZA 190-HZ| 5 at 16W, 10 at 8W tap| FS2C/SE/P
FreeSpace IZA 2120-HZ| 6 at 16W, 13 at 8W| FS2C/SE/P
Power Share PS404D| 22 at 16W, 45 at 8W| FS2SE
Power Space P4150+| 8 at 16W, 17 at 8W| FS2SE
Smart Bass: Application of Smart Bass processing
If your design is using a Power Space+ amplifier; or your design utilizes a
dedicated Bose DSP, such as the Commercial Sound Processor CSP models; or any
of the Control Space ESP or EX models; you have the option of applying Smart
Bass 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, Smart Bass also
allows for more musical limiting than traditional voltage limiters.
Tap Charts
Individual Loudspeaker Continuous Output Level
Note: The following tap charts assume standing ear height at 1.5 meters
(5 feet) in standard 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.
DM3SE
DM3SE
(standing listener height)
Mounting Height| m| 2.4| 2.7| 3| 3.7| 4| 4.3| 5| 5.5| 6| 6.7| 8| 9.8|
| ft| 8| 9| 10| 12| 13| 14| 16| 18| 20| 22| 26| 32
TAP| 3W| 88| 85| 83| 80| 79| 78| 77| 75| 74| 73| 71| 69| dB-SPL
6W| 91| 88| 86| 83| 82| 81| 80| 78| 77| 76| 74| 72
12W| 94| 91| 89| 86| 85| 84| 83| 81| 80| 79| 77| 75
25W| 97| 94| 93| 90| 89| 88| 86| 84| 83| 82| 80| 78
8Ώ| 97| 94| 93| 90| 89| 88| 86| 84| 83| 82| 80| 78
FS2SE
FS2SE
(standing listener height)
Mounting Height| m| 2.4| 2.7| 3| 3.7| 4| 4.3| 5| 5.5| 6| 6.7| 8| 9.8|
| ft| 8| 9| 10| 12| 13| 14| 16| 18| 20| 22| 26| 32
TAP| 1W| 86| 83| 82| 79| 78| 77| 75| 73| 72| 71| —| —| dB-SPL
2W| 89| 87| 85| 82| 81| 80| 78| 76| 75| 74| 72| 70
4W| 92| 90| 88| 85| 84| 83| 81| 79| 78| 77| 75| 73
8W| 95| 93| 91| 88| 87| 86| 84| 82| 81| 80| 78| 76
16W| 98| 96| 94| 91| 90| 89| 87| 85| 84| 83| 81| 79
8Ώ| 98| 96| 94| 91| 90| 89| 87| 85| 84| 83| 81| 79
FS4SE
FS4SE
(standing listener height)
Mounting Height| m| 2.4| 2.7| 3| 3.7| 4| 4.3| 5| 5.5| 6| 6.7| 8| 9.8|
| ft| 8| 9| 10| 12| 13| 14| 16| 18| 20| 22| 26| 32
TAP| 2.5W| 90| 87| 86| 83| 82| 81| 79| 77| 76| 75| 73| 71| dB-SPL
5W| 93| 90| 89| 86| 85| 84| 82| 80| 79| 78| 76| 74
10W| 96| 93| 92| 89| 88| 87| 85| 83| 82| 81| 79| 77
20W| 99| 96| 95| 92| 91| 90| 88| 86| 85| 84| 82| 80
40W| 102| 100| 98| 95| 94| 93| 91| 89| 88| 87| 85| 83
8Ώ| 102| 100| 98| 95| 94| 93| 91| 89| 88| 87| 85| 83
DM5SE
DM5SE
(standing listener height)
Mounting Height| m| 2.4| 2.7| 3| 3.7| 4| 4.3| 5| 5.5| 6| 6.7| 8| 9.8|
| ft| 8| 9| 10| 12| 13| 14| 16| 18| 20| 22| 26| 32
TAP| 3W| 91| 88| 86| 83| 82| 81| 80| 78| 77| 76| 74| 72| 94
91| 94| 91| 89| 86| 85| 84| 83| 81| 80| 79| 77| 75
12W| 97| 94| 92| 89| 88| 87| 86| 84| 83| 82| 80| 78
25W| 100| 97| 96| 93| 92| 91| 89| 87| 86| 85| 83| 81
50W| 103| 100| 99| 96| 95| 94| 92| 90| 89| 88| 86| 84
8Ώ| 103| 100| 99| 96| 95| 94| 92| 90| 89| 88| 86| 84
DM6SE
DM6SE
(standing listener height)
Mounting Height| m| 2.4| 2.7| 3| 3.7| 4| 4.3| 5| 5.5| 6| 6.7| 8| 9.8|
| ft| 8| 9| 10| 12| 13| 14| 16| 18| 20| 22| 26| 32
TAP| 2.5W| 91| 88| 87| 84| 83| 82| 80| 78| 77| 76| 74| 72| dB-SPL
5W| 94| 91| 90| 87| 86| 85| 83| 81| 80| 79| 77| 75
10W| 97| 94| 93| 90| 89| 88| 86| 84| 83| 82| 80| 78
20W| 100| 97| 96| 93| 92| 91| 89| 87| 86| 85| 83| 81
40W| 103| 101| 99| 96| 95| 94| 92| 90| 89| 88| 86| 84
80W| 106| 104| 102| 99| 98| 97| 95| 93| 92| 91| 89| 87
8Ώ| 107| 104| 103| 100| 99| 98| 96| 94| 93| 92| 90| 88
DM8S
DM8S
(standing listener height)
Mounting Height| m| 2.4| 2.7| 3| 3.7| 4| 4.3| 5| 5.5| 6| 6.7| 8| 9.8|
| ft| 8| 9| 10| 12| 13| 14| 16| 18| 20| 22| 26| 32
TAP| 2.5W| 95| 92| 87| 84| 83| 82| 80| 78| 77| 76| 74| 72| dB-SPL
5W| 98| 95| 90| 87| 86| 85| 83| 81| 80| 79| 77| 75
10W| 101| 98| 93| 90| 89| 88| 86| 84| 83| 82| 80| 78
20W| 104| 101| 96| 93| 92| 91| 89| 87| 86| 85| 83| 81
40W| 107| 104| 99| 96| 95| 94| 92| 90| 89| 88| 86| 84
80W| 110| 107| 102| 99| 98| 97| 95| 93| 92| 91| 89| 87
8Ώ| 112| 109| 107| 104| 103| 102| 101| 99| 98| 97| 95| 93
Graph Paper
©2022 Bose Corporation, All rights reserved.
Framingham, MA 01701-9168 USA
PRO.BOSE.COM
Rev. 01 | January 2022
References
- Bose Professional
- Business Music System Designer
- Modeler Sound System Software | Bose Professional
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