like papasmurf said... dynamat will reduce VIBRATION noise, not ACCUSTIC noise. the best way to quiet the case, IMO, is to get high quaility silent fans. if they are still too loud, you may want to consider running the fans into a bay bus so when you do not need the fans at full voltage, bump them down to 7 volts. i do this and it works wonders considering my case only really heats up when i am gaming.