Been thinking about this for a while. Have a QSC power amp and live in a house that collects more dust than anyplace I've ever lived in. Is there any kind of filter that can be stuck on the outside of that fan cage that will filter the dust with little or no impairment to circulation? Don't even use that amp much and the fan is half covered already with dust - and the amp stays covered when not in use. ========================= "The only Holy Grail thats exists in the bass world is not in the bass, it's in the player."