ONKYO TX-SR577 B. Audio output channels: 7.1, Total Harmonic Distortion (THD): 0.08 %, Audio D/A Converter (DAC): 24-bit/192kHz. Headphone connectivity: 6.3 mm. Connectivity technology: Wired. Supported radio bands: AM/FM, RDS features: PS/RT/PTY/TP, AM band range: 522 - 1611 kHz. Supported video modes: 720p, 1080i