I plugged my 4th Puron filter in to the power conditioner. 2 Puron's at or near the wall that feeds the power conditioner and 1 at or near the wall that feeds my amp. Great sound and clarity from them the only down side after plugging the one into my power conditioner the soundstage is not as tall. Very happy with the sound just not as tall soundstage. May after a while try and moving it to the amp line, which will give me 2 on each power line near the wall.
I did try the High Fidelity Q 45t on 1 Puron filter. Right away it dulled the sound and took about 30 hours before the sound returned to the level it was before. It did not do any thing for the sound. In the long run it did not hurt the sound. In fact its still on the Puron filter.