I'm not really good with electronics, so you made my day by helping! Fan1: 120mm - 0.19A Fan2: 80mm - 0.36A 12V DC adapter: 0.42A Fan controller: 4 channels, 0.7A each channel (voltage goes from 6V to 12V), all channels combined is 2.8A total. I have a 2A - 12V adapter laying around somewhere , is it a good idea to stop using the 0.42A and switch to the 2A adapter?
You could buy a double adapter from eBay. That way you will have two plugs and a socket for a couple of bucks If you run an eBay search for "pc fan double" you should get a selection of options
There is a margin of safety when it comes to the adapters but as it's rated for 420mA and the fans will draw 550mA I would use a larger one if it's an option. If each channel of the fan controller can handle 700mA then it will be fine with those fans.
420mA, I think thats a sign from the Cannabis Gods Thanks for explaining! I'm gonna wire the 2A adapter as soon as possible
I have actually figured this out pretty thoroughly, I also found a very helpful video! Give it a shot. How to wire PC fan to wall wart power supply: http://youtu.be/WkJ0AD59EYw