After reading through the comments here, I have some work to do. My no HVAC baseline noise level, C weighted, is ~ 40 db! I can't avoid the white noise of HVAC on, as there is are two ducts and one return in the room, plus the system is in an adjacent room. Like many of you, I just try to avoid listening when it's running. But getting another 10 db of quiet would be nice......
Those magical days when the HVAC is off
I'm reminded these last few days when after 90 days straight with the AC running, the weather broke and the temps dropped, and with no AC running (or likewise in winter when no heat is cranking) my rig sounds easily 20% better - like I had added a new component- more clarity, overtones/timbre, sparkle - the standard sonic improvement adjectives - so how does one accomplish this year 'round? Which power related component is the one that allows your audio rig to operate unimpeded by air conditioning, the furnace, an overloaded electrical grid? I have separate dedicated lines to my components, but my rig really flows in a magical way when these climate conditioning appliances are not running. Is it power conditioning, or power regeneration that could possibly allow me to enjoy this increased audio performance more frequently or permanently? Any personal experiences of successfully solving this dilemma would be welcomed. Cheers, and thank you in advance.