Han, when tone controls, equalization, etc. are set flat, the frequency response of the Denon and Yamaha(and other similar receivers)are both audibly flat from 20-20KHz. Therefore, they amplify transparently and have no "sound character". Claims to the contrary collapse when the ears alone have to be relied upon in a blind listening test. Also note that the video "upconversion" feature may not be of real benefit unless this processing is better than the processing which your HDTV already does.

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Enjoy the music, not the equipment.