Yamaha AVENTAGE RX-A670 Owner's Manual

Select the speaker layout for the number of speakers that you are using and place the speakers and subwoofer in your room. This section describes the representative speaker
layout examples.

▪ (U.S.A. and Canada models only)

Under its default settings, the unit is configured for 8-ohm speakers. When connecting 6-ohm speakers, set the unit’s speaker impedance to “6 Ω MIN”. For details, see “Setting the speaker impedance” (p.22).

▪ (Except for U.S.A. and Canada models)

Use speakers with an impedance of at least 6 W.

▪ Use a subwoofer with built-in amplifier.
▪ Be sure to connect the front left and right speakers.