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

 

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.

Use the following chart to determine the approximate spacing between background and paging speaker systems.

In rooms requiring less than 5 speakers, plan to place speakers in a square or hexagonal pattern using the speaker distance charts.

2. Description
Very soft background music in a quiet room
Typical background noise in a private office
A 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 concert two rows back
Deciding how loud each speaker should play is determined by the application and usage.  The chart to the right will help identify the needed 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 furthest distance between the speaker and the listener in each area. Use these charts to add volume to compensate for the distance. Add the distance compensation to the desired volume for each area to create a TARGET SPL (sound pressure level) figure.
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Continue to Steps 4-8