Overclockers Club published a review on the Phanteks Eclipse P400S
A quote from the article:
The built-in 3-speed fan controller is another nice feature, along with the sound deadening material on the inside of the case panels. That material is the reason for the "S" in the P400S model number. There is room at the top for two extra fans and I like the way you can leave the top open, use the magnetic filter panels, or completely cover the top with the included covers.Phanteks Eclipse P400S Review @ OCC