Hello, I have aiwa xr-md110 it has SPDIF input and Stereo Speakers out. It is connected with my digital setup box using SPDIF (Optic Connector). Now the issue is that only music and sound effect is coming out from both Left and right speakers. No Vocal is transmitted. What could be wrong ? Same happens when i connect this amplifier with SPDIF output of my LED TV and run anything from USB. its like the amp is treating SPDIF signal as surround sound and only transmitting surround sound of background sound to these speakers? Pics are attached for connection detail etc . Please help
