5.1 Speaker Placement -- Not to beat a dead horse

http://www.avsforum.com/t/1457894/do-you-prefer-bipole-dipole-or-monopole-surround-speakers
http://forum.blu-ray.com/showthread.php?t=170720

Tons of info on this subject. IMHO, there is no right answer, it is a preference thing. I personally like my bipole surrounds.

The Dolby 5.1 setup shows monopole mounted 90-110 degrees L/R. Yes, there are lots of people running monopole vs dipole/bipole.

http://www.dolby.com/us/en/consumer/setup/connection-guide/home-theater-speaker-guide/index.html

Do you have a sketch of your room? Perhaps there is something we are not getting that the AV company knows. And in your original post you asked "what was best" in terms of the type of surround speaker. I am simply trying to explain that this is a preference thing. What is best is what you prefer and your room itself. I have had both monpole and bipole side surrounds and prefer bipole. At this point, you just have the wiring run, correct? You have not purchased speakers?

Lol, surround monopoles will cancel each other out! What will they think of next. I swear, ya hear a new one every day. To answer your question, no, monopoles in that setup will not cancel each other out to the degree that you have to worry about it. Cancellation can happen, but at those frequencies in that type of setup, you don't have to worry about it at all. I hope these guys you are going to don't have any official certification, they don't sound like they are qualified to install audio systems. They are probably the same guys who said smaller cones sound better than large cones on subwoofers. Anyway, cancellation will happen in every audio setup, but you only really have to worry about it at the bass frequencies. If you do something like place two speakers right next to each other, you can hear cancellation interference in the form of comb filtering, but even then they have to be playing the same sound. Just make your speaker placement stick as close as you can to dolby's recommended placement and you will be fine (except for the subwoofers, subs are a different story).

I know THX standard pushes dipole solutions typically, so I am guessing these guys just read too much into THX recommendations. Lots of people on AVS and other sites that are knowledgeable and picky about audio run monopole 5.1 setups and they prefer them. Which is why I pointed out earlier that it is more of a preference thing that anything else.

You had a yeast infection in your speakers? Oops, no, that's Monistat and it's not for use with speakers either.

Your front speakers are also pointing at the same spot so they should cancel each other out too:D

lol jk
Monopole /bi/dipole all preference based. I know THX systems have bipole/dipoles but I believe that is because they are trying to get the same sound of the big cinema(side arrays) into the home.