Hey all, thanks for all the advice. I found an interview with John Dahl from
THX that says:
"How one places the speakers depends on a couple of
things. Our prime recommendation for consumers using
components with THX Ultra2 Certification and looking
for a single speaker arrangement for cinema and music
is the following: two dipole speakers to the side and
two direct radiators in the back touching side by side
with the ASA circuit engaged at a distance less than
one foot. (Figure 2). The ASA circuit takes the single
back channel signal and using the two speakers makes
it sound like one timbrally correct wall-to-wall
sound. In THX cinema mode, the balance is as recorded.
In THX Music mode, the sound is biased toward the back
to mimic the ITU recommendations for 5.1 speaker
placement in music recording situations."
...
"With any of these systems, be careful that no one is
sitting directly on axis and close to any of the
speaker faces. Loud on-axis sound above 500Hz is very
tiring to listen to when it's constant and outside of
the field of vision."
http://www.audioholics.com/FAQs/THXp2.html
What I am thinking of doing, is going with the
monopole rears, but putting them on a "turntable".
Then, they can either face forward (direct radiating),
or I can spin them 90 degrees (back-to-back) to face
their respective wall (dipole operation). Do you
think this idea will work?