Standard fans don't have any such speed control cables.
You need to use motherboard's control for fans, if it has decent one, or separate fan control panel which doesn't rely on software.
This should be good basic controller for fixed manually set speed.
https://www.overclockers.co.uk/lamptron-fc6-5.25-bay-fan-controller-black-bb-002-lp.html
That uses linear regulator instead of chopping voltage with PWM so won't cause unnecessary sounds from any fan.
Some controllers use chopping 12V with PWM as cheap and dirty voltage control for higher output power without sturdier/better cooled transistors/regulators.
(multiple fans in same channel or very high speed fans can draw considerable amount of power)
Then there are touch display ones:
https://www.overclockers.co.uk/scythe-kaze-master-flat-ii-black-bb-019-sy.html
https://www.overclockers.co.uk/lamptron-cw611-watercooling-controller-black-cm-047-lp.html
And as ultimate high end Aqua Computer's Aquaero is whole system capable to controlling air/water cooling independently from any software using its own microprocessor.
You can set own fan speed curves for increasing fan speed depending on temperature readings, or even calculated average of multiple sensors.
Versions with also physical control interface instead of relying on use of software to do settings just aren't cheap.
Just ordered myself one yesterday for improving fan control at low load use.
Should have really done that years ago considering I've been using two fixed manually set speed fan controllers.
(Lian Li PC-A71B case itself takes 6 fans without adding PCI cooling kit and counting in CPU HSF's fan)
Scythe SlipStream/Kaze Jyuni would be very good fan with smooth sound profile when used with controller:
https://www.overclockers.co.uk/scythe-kaze-jyuni-1200rpm-slipstream-120mm-fan-fg-021-sy.html
Because of moving more air per RPM than most fans it needs lower speed than others.
Though as basic sleeve bearing fan it doesn't have long "service life" and wouldn't try running it in horizontal position. (top fan)
And might not be available that well outside what's in stock.
Arctic Cooling F12 (non-Pro) should be roughly similar quite nice for its price and have longer life bearing variant.