Right now I have the preamp output being used for my subwoofer so I'm pretty sure this is what's going on.<BR><BR>Now, for the external inputs, I have no clue what they could be used for.

I'm researching preamp-amp matches and due to lack of information on the Internet am left with a question regarding output/input differences between balanced and unbalanced feeds. The contemplated ...

However, when a home theater receiver's preamp outputs are used, the outputs disable the receiver's internal amplifiers for the corresponding built-in amplifier channels.