@grannyring : for power cords with Zavfino, I was told the "in-house" break in process is equivalent to 40 hours of continuous playback, and they reach optimal performance in approximately 100-200 hours total. I put mine on a heavy duty ventilator non-stop for about four days 24/7, then in my audio. It sounded great at that point, and I preferred it over the $3,000+ MSRP power cord it replaced like-for-like