the A-809 is part of the range of Onkyo Integra is the high-end components selected from the best. Nothing to say about the build quality and sound. Practical side selector "source direct", 2 220V on the back, headphone jack on the front. A fault anyway, common to all onkyo amps of that era: the source selector which changes source alone. The solution is sprayed onto the contacts of the bomb "special touch" and is quiet for 2 years. Amp very heavy: 20kg, demonstrating the quality of components used. Everything is oversized. If you get the chance, buy it without hesitation. Even an A-807. It is only the power to change.