A common user query is “Error 134 on AVR 51” . This occurs when the EZSET microphone detects a phase mismatch (positive/negative speaker wires swapped). The manual explicitly lists code 134 as: “Left and Right speakers out of phase. Reverse connections.”
Usually caused by a tiny stray wire at the speaker terminals or overheating. Check your wiring for shorts before assuming the worst. harman kardon avr 51 user manual 134 better
You turn on the AVR 51, it powers up, but no audio comes out. A common user query is “Error 134 on AVR 51”