Actually, Harley, it's just the opposite in my experience. Lower level components benefit the most.

Several years ago the guys at Music For Pleasure threw me a Transparent power cord to try. I went in to borrow a 6 outlet power conditioner. I tried the conditioner by itself and did not like it. As E-stat referred to the conditioner, I suspect, limited the current to my Krell and the result was a weaker presentation. So with that set aside I remembered the power cord. I honestly didn't think a power cord could make a difference. After trying it first on my CD player I was amazed at the improvement. I began to rotate the power cord to each of my components. Each demonstrated an improvement. The largest, most noticeable was in the CD player and phono preamp. So I when I took the outlet device back I bought a power cord for every component in my system that allowed a replacement. Remind me to show you behind the sceens you will see the Quintessence with several after market Transparent power cords coming from it. I do have one MIT Z-cord I bought for my Linn amp. It worked beautifully on it. I have not compared the Transparent against the MIT, too much trouble. I highly recommend trying one of the Transparent and MFP will allow you to audition one before you buy.