25/70/100 VOLT SYSTEMS
AUDIOPLEX CONSTANT VOLTAGE SYSTEMS
Designing Constant Voltage Audio Systems

 

OTHER PRODUCTS IN THIS CATEGORY
Smooth Response
+/-4dB
6'
8'
11'
14'
17'
20'
23'
25'
28'
31'
34'
37'
Acceptable Response
+/-8dB
8'
12'
16'
20'
24'
28'
32'
36'
40'
44'
48'
52'

Ceiling Height

8'
10'
12'
14'
16'
18'
20'
22'
24'
26'
28'
30'

Best Response
+/-2dB
4'
6'
8'
10'
12'
14'
16'
18'
20'
22'
24'
26'
1.

When placing background or paging speakers on the ceiling, use the following chart to determine the approximate spacing between speakers.

In rooms requiring less than 5 speakers, plan to place speakers in a criss-cross square or hexagonal pattern using the charted inter-speaker distance as a rough rule of thumb.

2. Description
Very soft background music at night in a quiet room
Background noise in a private office near light traffic
One person speaking in a normal voice from 3 feet
A sewing machine at 3 feet
A vacuum cleaner at 6 feet
A Harley Davidson starting at 6 feet
A live symphony orchestra two rows back
Decide how loud each speaker will play at maximum volume in decibels. Write down the desired volume for each area in decibels.
Decibels
45 dB
55 dB
65 dB
75 dB
85 dB
95 dB
105 dB
3.
Distance

3 feet
6 feet
12 feet
24 feet
48 feet
Distance Compensation
(indoors)
No Loss
+4 dB
+8 dB
+12 dB
+15 dB
Distance Outdoors
(outdoors)
No Loss
+6 dB
+12 dB
+18 dB
+24 dB
Determine the worst case (furthest) distance between the speaker and the listener in each area. Use these charts to add decibels to compensate for the loss due to distance. Add the distance compensation to the desired voume for each area to create a TARGET SPL (sound pressure level) figure.
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Continue to Steps 4-8