You can't go wrong with an Lamptronn FC-5 V2. 30 watts per channel so even if those 6 fans were high powered san aces, you'd still be able to hook them up to one knob.
But if I were in your position, I would grab any of the Lamptron fan controllers and mod it into one of the mesh drive bay covers on the Haf X. I think it would look really good. I recently just bought this from an OCN member and will be modding it into one of my bay covers.
I have a Sunbeam Rheosmart. I can only say amazing things about this little guy, right now he's plucking away with two San Ace 1011's on ONCE CHANNEL(among a few other fans). I'm trying to stress test the little guys but so far its amazing, can handle a few fans per channel, dosnt matter if they are high power or low power... so far it worked for fine with 6 fans on one channel including the 1011's
If the Rheosmart is to pricy, or the smart feature dosnt do it for you, the Rheostat would be the el chepo controller to get, 15 bucks at the local micro center(and many online vendors). It only has 4 channel's but you can just wire the fans so that once channel is intake, second is exhaust, third would be CPU fans, or what ever. Rheostat will hold a bunch of high powerd fans per channel aswell. My 2 cents.
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