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query on Kenwood amplifier

Question 1: My Kenwood Amplifier KA 57 audio output volume is very low compared to its 200W's it's supposed to give with an 6ohm speakers. What could be the problem?

Question 2: I need an schemetic diagram for the same amplifier(kenwood KA 57), can you help me?

Kenwood KA57

The KA57 is an honest amplifier rated for 60 watt per channel on 8 ohm. The 200 watt data is its power consumption, not its power output.