Does anyone know why TAP9000es has 8 preout connection since it's only 5.1 Multi-Ch. preamp? I'm thinking of pairing it with Oppo, however, I will be limited to 5.1 system. Are there any workarounds to make it work for 7.1 system? So far, I love the performance of it for 2Ch. over Integra 80.2 with or without Audyssey.