- Joined
- Jun 8, 2002
- Location
- Melbourne, Australia
Okay, this is what the pumps sound like. Now I have two pumps here, one is slightly louder than the other one. I used the quieter one for this test. The pumps/fans were sat atop vibration deadening foam in a quiet room. The microphone was positioned 10cm (4") from the thing making the noise.
http://www.employees.org/~slf/pumpfans.wav
Approximate times within the sound clip:
0-7.5s - Laing D4 (DD 12V) Pump at 12V
7.5-15s - Laing D4 (DD 12V) Pump at 16V
15-22.5s - Generic 3000RPM 80mm Axial Case Fan
22.5-30s - YSTech 4500RPM 60mm Axial Fan
30-38s - Papst 612NGML 60mm 2500RPM Axial Fan
Now I don't pretend that I have a noise floor much below 30dBA so you can get a good guage for the relative volumes by listening to the Papst fan (the last sound section) which is noticably audible in a quiet room from 1m (3') away, despite it carrying a 20dBA rating by the manufacturer.
http://www.employees.org/~slf/pumpfans.wav
Approximate times within the sound clip:
0-7.5s - Laing D4 (DD 12V) Pump at 12V
7.5-15s - Laing D4 (DD 12V) Pump at 16V
15-22.5s - Generic 3000RPM 80mm Axial Case Fan
22.5-30s - YSTech 4500RPM 60mm Axial Fan
30-38s - Papst 612NGML 60mm 2500RPM Axial Fan
Now I don't pretend that I have a noise floor much below 30dBA so you can get a good guage for the relative volumes by listening to the Papst fan (the last sound section) which is noticably audible in a quiet room from 1m (3') away, despite it carrying a 20dBA rating by the manufacturer.