I just bought a rhino silent fan contoller, it was more pricey than the cheap ones but produces no hum, no need to wire just plug and go. There’s 2 types of controllers, the cheap ones under 80buck are crap and hum like mad when you turn them down, anything above the 100 buck mark has no hum. And worth it. If your good with electrics you can get cheaper options but research them online loads of cheap ones that are good if you know your stuff.