this is from "batpig", a guy who wrote an online denon-to-english manual:
A. There are two ways to hook up Zone 2 speakers to your Denon AVR:
1. If you are only running 5.1 in your main zone, you can reassign your SURROUND BACK amplifiers to power the Zone 2 speakers. To do this, go to MANUAL SETUP > OPTION SETUP > AMP ASSIGN and set the assignment to "Zone 2". With this setup, you will hook up your two surround speakers with normal speaker wire and connect them to the SURR.BACK LEFT/RIGHT speaker posts on the back of the receiver. The receiver will power the speakers, and you will also be able to control the volume for Zone 2 in the receiver.
2. The second option (and your only option if you are running 7.1 in the main zone) is to connect an external amplifier to the "ZONE 2 OUT" pre-outs on the back of your AVR. You will use standard RCA cables (red/white analog) to connect from the Zone 2 pre-outs to the inputs of your external amplifier. In this setup, the external amp will provide the power and volume control for the Zone 2 speakers.
A. There are two ways to hook up Zone 2 speakers to your Denon AVR:
1. If you are only running 5.1 in your main zone, you can reassign your SURROUND BACK amplifiers to power the Zone 2 speakers. To do this, go to MANUAL SETUP > OPTION SETUP > AMP ASSIGN and set the assignment to "Zone 2". With this setup, you will hook up your two surround speakers with normal speaker wire and connect them to the SURR.BACK LEFT/RIGHT speaker posts on the back of the receiver. The receiver will power the speakers, and you will also be able to control the volume for Zone 2 in the receiver.
2. The second option (and your only option if you are running 7.1 in the main zone) is to connect an external amplifier to the "ZONE 2 OUT" pre-outs on the back of your AVR. You will use standard RCA cables (red/white analog) to connect from the Zone 2 pre-outs to the inputs of your external amplifier. In this setup, the external amp will provide the power and volume control for the Zone 2 speakers.