George, although using a balanced connection isn't usually significant in home audio since the unbalanced coaxial cable connection is adequate for protection against interference, note that using an adapter into the balanced input doesn't mean that the connection is balanced. The adapter allows using the single unbalanced conductor into the balanced input designed for two conductors, but the connection remains an unbalanced one. No cancellation of interference such as occurs when both the preamp and the amp have balanced connections is possible.
