PS Audio gives you a 30-day In-home trial of all of their products.
I don't have the line issues you report, but I ordered the Stellar PowerPlant 3 just to "see" if it made any difference. I didn't even want to spend the money for it and I assumed I'd be returning it when I ordered it.
To my surprise it made all my system sound much better and I had to keep it because of the improved SQ I got from it.