I have had 8 holostages for the last 8 months. I have placed them on all of my components and crossovers in my system. i have two sitting on a shelf behind me. I have an all-Aries Cerat system, so it is hard to hear improvements in SQ. I know Krissy and was a fan of PPT in its heyday. In fact, I think Krissy has more knowledge and understanding of the audio effects of tweaks than even Tim had.
To all of you naysayers, unless you have tried them don't bother commenting. You are wasting everyone's time. You have a 60 day trial period.
I talked to Krissy at great length before purchasing. Was I skeptical? Somewhat. But, If I can spend $20k for a power cord, I can certainly try 4 holostage. When I first got them, I really did not hear an impact. TBH, I was not surprised, given the quality of my total system. I had 18 SR HFTs scattered around my room. My wife hated them, and quite frankly, they did nothing to improve my system. They were removed. About the third day, I was sitting in my chair, and I looked up when I was listening. That usually means something has changed. In this case, the music reached another increment. The music filled the room; the sound was bigger and more holographic with more clarity. So for me, the Heartsound Holostage was worth the investment I made.
I am not here to promote Heartsound. I am here to say try them and if they do not work for you, simply return them.