I got this from the manual of the upcoming Raven 03 case, page 58 w/c talks about the limitation/quirkiness of the AP181. You can DL it yourself. Hope this helps!
A: The Air Penetrator AP181 fans use industry standard 3pin fan connectors so they will work with most fan controllers available on the market or with
motherboards and any methods of voltage reducing mechanisms. The starting voltage for AP181 at low speed setting requires about 10.8V, which some
fan controllers may not support properly. So when connecting to fan controller, it is best to flip the case’s fan speed switch to high setting to enable lower
starting voltage. At 5V for example, the fan speed will be at around 500rpm, which is nearly inaudible. When connecting to motherboard for fan speed
control, if AP181 appears to have trouble starting, it may be due to motherboard detecting low temperature and supply too little voltage. To solve this
problem, please change the motherboard fan speed or temperature setting from within the motherboard BIOS or flip the case’s fan speed switch to high setting.