Logitech Squeezebox Duet Quick Start Manual page 6

Connect the receiver
1. Fit the adapter onto the AC adapter plug of the receiver, making sure the
adapter snaps into place.
2. Plug the AC adapter into an electrical outlet, and then insert the barrel
plug into the receiver. The LED on the front of the receiver should blink
red, indicating that the receiver is powered up, but is not yet programmed
for your network.
3. Connect your stereo or powered speakers to the receiver, using the
supplied color-coded, gold-plated RCA cables, which can be used with
nearly any stereo or powered speaker system. You can also connect the
receiver to a DAC via the SPjDIF connector, using your own optical or
coaxial cable.