This sounds very strange. I've not experienced the mentioned noise. Normally fans sometimes give out bearing noise which is caused by lowered voltage, but this is depending on the fan. It could be clicking or grinding noise. This should sound always the same, doesn't matter which fan controller you would use. My guess is that it is not the fan controller, but if you say it is same noise with all fans but it doesn't happen with other fan controllers, then this could be a malfunction and you can RMA it to the shop where you ahve bought it. They will send the item to us afterwards so we will be able to check it then.