I've found the trick to using the H1A's is to control them with a rheobus. I use 4 H1A 80MM's in my main system, and 2 H1A's in my game system (in conjuction with 2-120MM L1A's), both using Sunbeam rheobus setups.
The minute you turn them down from the "high" (12v) posiition, their noise level drops dramatically! At the 7V level they are as quiet as the L1A's, but push more air. My main system is running 24/7, and sits next to my entertainment center in my living room. At the 7V setting, the fans are inaudible while watching quiet scenes on TV or DVD's.