Technics SUV500 2-Channel Amplifier "outside speaker sound faint" Questions

...sound out of the speakers. I tested the speakers with another system and they were fine. If I crank the volume up to 'full blast' I can hear it but faintly. Its like standing next to someone who has ...

...outside of the case but nothing. I pressed the help/reset button and the text says system is operating correctly. Any advice is appreciated. I have it connected to a tuner and a cd player and the ...