Quote:
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Originally Posted by JSimmons
I have a tdx(cpu), maze4(gpu), BIX, and a D4, with three pabst 120mm fans volted down to 7V. I can't hear the pump at all (don't know why everyone says this pump is noisy), and can just barely hear the fans.
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This is an indication of the noise that D4 users regularly complain about
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Voice Reference Based Sound Clip
Turn your volume right up for this one - the recording level is quite low. Hear that high pitched buzzing whine that drills into your skull? Turn up the volume until you can hear the voice at a level that sounds like someone talking from two feet in front of you. The buzzing whine is now at a level of how loud it is from 6" away from the pump. Keep the clip looping (ignoring the voice) and see how long it takes before that noise gets to you.
http://www.employees.org/~slf/d4-voice.wav
D4 vs various fans based sound-clip
http://www.employees.org/~slf/pumpfans.wav
Approximate times within the sound clip. Recordings were taken from 6" away from each item.
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