Cello - perhaps you mean the Black Mamba? A "Mambo" is a dance :-)
A couple of points:
1. The Black Mamba is about five years old. Technology marches on. Using a five-year-old cord to generalize about all of Shunyata's current products is not quite fair.
2. The Black Mamba is/was a Noise Reduction power cord, designed predominantly for digital source components. I can't think of a worse cord to use on a Levinson amp. The Levinson amps are served properly with a Pacesetter cord, not a Noise Reduction cord.
So, I'm not surprised you didn't like the Black Mamba with your Levinson amp. It definitely wasn't the right match.
A couple of points:
1. The Black Mamba is about five years old. Technology marches on. Using a five-year-old cord to generalize about all of Shunyata's current products is not quite fair.
2. The Black Mamba is/was a Noise Reduction power cord, designed predominantly for digital source components. I can't think of a worse cord to use on a Levinson amp. The Levinson amps are served properly with a Pacesetter cord, not a Noise Reduction cord.
So, I'm not surprised you didn't like the Black Mamba with your Levinson amp. It definitely wasn't the right match.