Page 6
Time to fire her up. Here we see the chassis enabled with the cold cathodes on. Obviously in daytime lighting that's no fun. But at twilight ...
See? Much nicer.
Sound levels. Now with case open at roughly 75cm away from the chassis and with all fans enabled you'll see a sound pressure of roughly 40 DBa. Which is a normal noise level. Now here's something interesting, next photo please.
With the case closed, the chassis makes more noise. The fan mesh is sucking in air which creates an audible noise.
|
TYPICAL SOUND LEVELS | ||
|
Jet takeoff (200 feet) |
120 dBA |
|
|
Construction Site |
110 dBA |
Intolerable |
|
Shout (5 feet) |
100 dBA |
|
|
Heavy truck (50 feet) |
90 dBA |
Very noisy |
|
Urban street |
80 dBA |
|
|
Automobile interior |
70 dBA |
Noisy |
|
Normal conversation (3 feet) |
60 dBA |
|
|
Office, classroom |
50 dBA |
Moderate |
|
Living room |
40 dBA |
|
|
Bedroom at night |
30 dBA |
Quiet |
|
Broadcast studio |
20 dBA |
|
|
Rustling leaves |
10 dBA |
Barely audible |
