Effective Loud Telephone Ringer Operation

Choosing an effective loud ringer solution depends greatly on the environment the telephone ringer will be used in. For reference, the following chart provides a guide to compare background noise levels in typical application environments.

Typical Background Noise Levels

Noise Level
(in dBA)		 Noise Level Description Applications & Comments
95 – 100 Extreme Front rows of a rock concert; Textile mills;
Conversation virtually impossible
80 – 90 Very Noisy Machine shop, printing plant; Conversation difficult if not impossible; Hearing protection may be worn
70 – 75 Noisy Factory; busy restaurant;
Voices must be raised to communicate
60 – 65 Quiet Office, Department Store;
Voices easily understood
50 – 55 Very Quiet Empty Auditorium or idle warehouse
Any noise easily heard

Allowable Background Noise vs. Distance to Listener

The following chart provides a guide to how Algo’s 1825 Duet Plus Loud Ringer performs with various background noise levels and distances. As can be seen, the greater the distance between the listener and the loud ringer, the lower the allowable background noise levels must be in order for the ringer to be effective.

Distance
Ringing
Paging
Feet (m)
Built-in Speaker
Horn Speaker
Built-in Speaker
Horn Speaker
4 (1.2)
91
110
77
93
10 (3)
83
102
69
85
20 (6.1)
77
96
63
79
30 (9.1)
73
92
59
75
50 (15)
69
88
55
71
100 (30)
63
82
–
65
200 (61)
57
76
–
59
500 (152)
–
68
–
51
1000 (305)
–
62
–
–

Background noise level measured in dBA.