Icrontic has posted a tuning guide for the Cooler Master ATC-230 case

The other day I was sitting around listening to my Big Tymers album when I heard a rumble in the bronx. This wasn't the usual rumble - it was coming from my computer case. This rumble was the rumble several of you are familiar with, and it's called airflow boys and girls. Airflow rules, but the noise is killer. There are several strategies you can employ in order to reduce the amount of noise pollution coming from your case, and one of those is insulation. I previously modified one of my Antec SX1030 cases with some high quality insulation, which significantly reduced noise. However, my new Cooler Master ATC-230 didn't have the luxury of this addition, and since I was feeling ghetto, I decided to install some ghetto insulation.

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