Unsound, if you would like I can show you a letter from Steve McCormick that disputes your position. It was written to Paul Speltz, who is known for the ZERO autoformer and the Anti-cables.
The letter states that with the DNA-series amplifiers they sound better driving a 4 ohm load through the ZEROs as opposed to direct), wherein the amp is loaded at 16 ohms, despite the fact that the amp has no trouble whatsoever doubling power into 4 ohms and can drive that load all day.
I also have spec sheets on a good number of solid state amps. Take a look- you will see that the 4 ohm distortion level is always higher than 8 or 16 ohms. This distortion is composed of a variety of harmonics, including the 5th, 7th and 9th, which contribute brightness and harshness. Take those things away, or reduce them and the system is instantly more musical.
The letter states that with the DNA-series amplifiers they sound better driving a 4 ohm load through the ZEROs as opposed to direct), wherein the amp is loaded at 16 ohms, despite the fact that the amp has no trouble whatsoever doubling power into 4 ohms and can drive that load all day.
I also have spec sheets on a good number of solid state amps. Take a look- you will see that the 4 ohm distortion level is always higher than 8 or 16 ohms. This distortion is composed of a variety of harmonics, including the 5th, 7th and 9th, which contribute brightness and harshness. Take those things away, or reduce them and the system is instantly more musical.