Frequency Plots
17% Fan Speed
200 Hz is the highest at low frequencies, while noise is about the same in mid-frequencies.
25% Fan Speed
Notable spikes at 50 Hz and 1.6 KHz.
50% Fan Speed
The 1.6 KHz spike remains, and another one is at 200 Hz.
75% Fan Speed
Noise increases at 200 Hz and close to 800 Hz frequencies, dropping in the higher frequencies.
100% Fan Speed
The noisiest frequency at full speed is the 800 Hz one.
Signal Recordings
I have recorded the signals shown above, but please keep in mind that I’ve enabled Automatic Gain Control (AGC) to do so to make it easier for you to reproduce them. The provided recordings are only offered for aural identification purposes.
17% Fan Speed
25% Fan Speed
50% Fan Speed
75% Fan Speed
100% Fan Speed
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Hello and thank you for the detailed review of the new Alphacool Apex Stealth Metal 120mm.
After reading your old articles I bought 3× Thermaltake TT TOUGHFAN 14 Pro and 3× Thermaltake TT TOUGHFAN 12 Pro to replace Be Quiet! SILENT WINGS PRO 4 140mm PWM and 120mm (Airflow in a MSI MPG Quietude 100S).
I find the framework to be of higher quality, more mature. I like the wiring without a sleeve, easier to fold and store.
For the same dB noise there is a vastly superior CFM and Static Pressure, and all this for almost a quarter of the price less (in Europe).
I was impatiently waiting for the Alphacool Apex Stealth in 120mm (and 140mm in 2024?) but your rigorous testing proves that there is a problem in the design of the blades.
I saved time and money thanks to you