I'm fairly sure that, at least when they wrote the user's manual, the pre-outs were supposed to carry audio when in the "Speaker B" setting. Might not have made it into the actual receiver design though...or a copy/paste typo....
From P. 69 of the UM:
Switching the speaker system
If you selected Speaker B in Surround back
speaker setting on page 94, three speaker
system settings are possible using SPEAKERS.
If you selected Normal, Front Bi-Amp or
ZONE 2, the button will simply switch your
main speaker system on or off. The options
below are for the Speaker B setting only.
• Use SPEAKERS on the front panel to
select a speaker system setting.
As mentioned above, if you have selected
Normal, the button will simply switch your
main speaker system (A) on or off.
Press repeatedly to choose a speaker system
option:
• SP►A – Sound is output from speaker
system A and the same signal is output
from the pre-out terminals.
• SP►B – Sound is output from the two
speakers connected to speaker system B.
Multichannel sources will not be heard.
The same signal is output from the
surround back channel pre-out terminals.
• SP►AB – Sound is output from speaker
system A (up to 5 channels, depending on
the source), the two speakers in speaker
system B, and the subwoofer. The sound
from speaker system B will be the same as
the sound from speaker system A
(multichannel sources will be downmixed
to 2 channels).
• SP► (off) – No sound is output from the
speakers. The same sound is output from
the pre-out terminals (including from your
subwoofer, if connected) as when
selecting speaker system A (above).
Dunno....would love for it to work as advertised....
From P. 69 of the UM:
Switching the speaker system
If you selected Speaker B in Surround back
speaker setting on page 94, three speaker
system settings are possible using SPEAKERS.
If you selected Normal, Front Bi-Amp or
ZONE 2, the button will simply switch your
main speaker system on or off. The options
below are for the Speaker B setting only.
• Use SPEAKERS on the front panel to
select a speaker system setting.
As mentioned above, if you have selected
Normal, the button will simply switch your
main speaker system (A) on or off.
Press repeatedly to choose a speaker system
option:
• SP►A – Sound is output from speaker
system A and the same signal is output
from the pre-out terminals.
• SP►B – Sound is output from the two
speakers connected to speaker system B.
Multichannel sources will not be heard.
The same signal is output from the
surround back channel pre-out terminals.
• SP►AB – Sound is output from speaker
system A (up to 5 channels, depending on
the source), the two speakers in speaker
system B, and the subwoofer. The sound
from speaker system B will be the same as
the sound from speaker system A
(multichannel sources will be downmixed
to 2 channels).
• SP► (off) – No sound is output from the
speakers. The same sound is output from
the pre-out terminals (including from your
subwoofer, if connected) as when
selecting speaker system A (above).
Dunno....would love for it to work as advertised....


























