Yamaha RX-V992 Owner's Manual page 38

Switching the IMPEDANCE SELECTOR switch on the
rear panel
Select the position whose requirements your speaker system
meets. Be sure to switch this only when the power of this unit is
turned off.
WARNING
Do not change the IMPEDANCE SELECTOR switch setting
while the power to this unit is on, otherwise this unit may
be damaged.
(Upper position)
Center: If you use one center speaker, the impedance of the
speaker must be 4 or higher.
If you use two center speakers, the impedance of each
speaker must be 4 or higher.
Rear: (U.S.A. and Canada models:)
The impedance of each speaker must be 4 or higher.
(Australia, Singapore and General models:)
The impedance of each speaker must be 6 or higher.
Main: If you use one pair of main speakers, the impedance of
each speaker must be 4 or higher.
If you use two pairs of main speakers, the impedance of
each speaker must be 8 or higher.
34
C OR D
IMPEDANCE SELECTOR
C D
CENTER C OR D: 4 MIN./ SPEAKER
SET SPEAKER MODE
C D: 4 MIN./ SPEAKER
SET SPEAKER MODE
REAR : 4 MIN./ SPEAKER
MAIN A OR B: 4 MIN./ SPEAKER
A B: 8 MIN./ SPEAKER
CENTER C OR D: 8 MIN./ SPEAKER
SET SPEAKER MODE
C D: 4 MIN./ SPEAKER
SET SPEAKER MODE
REAR : 8 MIN./ SPEAKER
MAIN A OR B: 8 MIN./ SPEAKER
A B:16 MIN./ SPEAKER
(General model)
(Lower position)
Center: If you use one center speaker, the impedance of the
speaker must be 8 or higher.
If you use two center speakers, the impedance of each
speaker must be 4 or higher.
Rear: The impedance of each speaker must be 8 or higher.
Main: If you use one pair of main speakers, the impedance of
each speaker must be 8 or higher.
(Except Canada model:)
If you use two pairs of main speakers, the impedance of
each speaker must be 16 or higher.