This powerful amplifier (500W into 8 ohms, 900W into 4 ohms) is the most consistent amplifier I have ever heard. Regardless of the load it performs equally well at all frequencies and never shows strain. At the same time its transparency and low noise floor allow it to fully reflect the character of upstream components and subtle nuances and harmonics. To accomplish that, Roger Sanders developed (patent pending) a voltage regulated power supply that maintains a stable voltage regardless of load or reasonable changes in the line voltage. This enables the maintenance of stable bias and unchanged distortion levels. In addition to outstanding audio performance, Roger Sanders stands behind his products (both amplifiers and loudspeakers) with a 30-day, in-home, risk-free trial. That includes free round-trip shipping anywhere in the world from the factory in Conifer, Colorado. Sanders products carry a lifetime warranty for the original owner. (Donald Shaulis)