Connecting Hometheater processor to second 2channel ampfilier

I was reading a forum, and I'm not quite sure I understood correctly. The  problem is I'm unable to find a Hometheater Processor with a Pass through I can afford, in order to listen to 2 channel music. He had a 7channel processor connected to a 7 channel amplifier. He then  conneced a 2ch amp with balanced and unbalanced connections to the processor. He hooked cables to both connections and when he wanted to listen to 2ch music, he flipped the switch between balanced and unbalanced  in back of the 2ch amp to listen to 2ch music. Is this possible or am I still misunderstanding.