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The AU-X911DG was introduced in 1987 and discontinued in 1991. Main amp is near the same as the AU-X901, but the 911DG are optimized in more places and a MASH 1-bits digital circuit with 4 digital in/out and 1 optical in/out. Amplification is 2x120/8ohm, 2x160/4ohm and 2x320/2ohm dynamically. Connections: Tuner, aux, CD, turntable with MM/MC, 4x digital, 1x optical, 3x tape with dubbing between all three. Frequency response on the amp is DC-100.000hz +/-0,005% total harmonic distorsion.