You make a good point here. While I have never heard of this being a problem with the HK units (but then again not having a HK I wouldn't be paying attention to this) If the HK has a finiky PS then certainly dirty power will play havoc with the unit. There are a number of good clean power sources available at reasonable prices so it may be worth trying. I have a unit on my system and I swear it improved the sound, not drastically and maybe it is even a phycological difference. I have not done any blind tests, and I wanted to add some power surge protection/filtering to protect my investment anyway. These units can't hurt your system and clean power should only make it better.
