Yamaha RX-V673 Owner's Manual page 44

Warning messages
If a warning message is displayed after the measurement, you can still save the measurement results by following on-screen instructions.
However, we recommend you perform YPAO again in order to use the unit with the optimal speaker settings.
Select "Wiring" in "Result" (p.41) and check the cable connections (+/-) of the speaker identified by
W-1 : Out of Phase A speaker cable may be connected with the reverse polarity "Reverse". If the speaker is connected incorrectly, turn off the unit and then reconnect the speaker cable.
(+/-). Depending on the type of speakers or room environment, this message may appear even if the speakers are
connected correctly.
W-2: Over Distance A speaker is placed more than 24 m (8O ft) from the listening Select "Distance" in "Result" (p.41) and move the speaker identified by ">24.0m (>80.0ft)" within 24 m (80 ft)
position, of the listening position.
Check the usage environment and cable connections (+/-) of each speaker, and the volume of the
W-3: Level Error There are significant volume differences between the subwoofer. We recommend using the same speakers or speakers with specifications that are as similar as
speakers, possible.
PREPARATIONS • Optimizing the speaker settings automatically (YPAO) En 44