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Rex,
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I have not had good results with the Shunyata cords (specifically, the Black Mambo). It was certainly better than the stock cords, but killed the detail and left the bass very unfocused, boomy and not at all tuneful.
I have had dramatically good results with the NBS Statement PC and significantly better and terrific results with the top end of the BMI products (Shark and Whale Supreme in particular).
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My point is that in my system, a great power cord that matches up well with your system, room and sound preference makes a huge difference in what a Levinson Amp is capable of putting out. There was a Jaw dropping difference for not a lot of money.
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I would suggest that Piperdan experiment with used cords (they sell at great discount to the list prices)and see what works for him. A used BMI Shark can be bought for around $ 300.00 - 350.00 and a Whale Supreme for a bit more. Both of these cords were dramatically better than the Black Mambo (which did help the Levinson Amp, but was no where near as beneficial as the BMI cords).
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Rgds,
Larry
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