I have noticed when the Puron is first plugged into my video, it takes approx. 15-30 minutes before the image really starts to pop and progresses further with more time.
So, based on this with our audio, perhaps plugging and unplugging to test the results is not a good way to evaluate it. (Even though the Stereo Times reviewer did). There may be a residual effect when unplugged.
Just plug it in and leave it in for a day, then unplug it, wait about an hour, and then listen, do you miss it?Ā
ozzy