You could connect your mono bass to IN1-8 if you wanted, using a similar approach to the one I describe. Also, if you are having trouble understanding the routing, try downloading the Routing utility from the H8000 support page.
Listening to 8 channels is more difficult, unless you have a mixer or an 8 channel speaker system. You can mix 2 H8000 channels to each output channel using the routing, but you would still need 4 speakers. This part is up to you …
