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Owner's Manual
Down Firing
The SM Series speaker systems also work well in a down firing configuration for spaces utilizing open beam ceilings such as offices,
restaurants and warehouses. When determining speaker spacing in down-firing installations, refer to the following chart:
Ceiling
Height
SM42T
8'
6'
9'
8'
10'
9'
11'
10'
12'
12'
13'
13.5'
14'
15'
15'
16'
16'
–
17'
–
18'
–
19'
–
20'
–
25'
–
30'
–
Note: Using the above spacing suggestions will maintain good, even high frequency coverage, which translates into excellent intelligi-
bility for voice reproduction and high fidelity music reproduction. To find out more about the formulas used to determine ceiling
speaker spacing, check out the book Sound System Engineering by Don and Carolyn Davis. To find out more about the limits of
wide dispersion loudspeakers, download the Atlas Sound white paper on the subject at
http://www.atlassound.com/Support/WhitePapers.aspx .
Surface Mount Loudspeakers
Speaker Spacing
SM52T
SM82T
6'
–
8'
–
9'
6'
10'
6.5'
12'
7.5'
13.5'
8.5'
15'
9.5'
16'
10'
17.5'
11'
19'
12'
20.5'
13'
22'
14'
23'
15'
–
19'
–
24'
SM42T = 90° Nominal Coverage at 2kHz
SM52T = 90° Nominal Coverage at 2kHz
SM82T = 65° Nominal Coverage at 2kHz
1601 Jack McKay Blvd. • Ennis, Texas 75119 U.S.A.
Telephone: 800.876.3333 • Fax: 800.765.3435
– 3 –
Specifications are subject to change without notice.
MAX SPL @ Highest Tap
(with the Listener @ 3.5')
SM42T
SM52T
97dB
102dB
96dB
101dB
94dB
99dB
93dB
98dB
92dB
97dB
91dB
96dB
90dB
95dB
89dB
94dB
–
93dB
–
93dB
–
92dB
–
92dB
–
91dB
–
–
–
–
SM82T
–
–
104dB
103dB
102dB
101dB
100dB
99dB
98dB
98dB
97dB
97dB
96dB
94dB
92dB
AtlasSound.com