I'm loving this thread. Potshots tracking room is awesome. Do those mirrors in brianhoods studio cause any weird reflection issues?
Stronger phantom center, wider stereo image (highs are more directional). It might be only subtly different. I found this just now recommending against horizontal placement. http://www.soundonsound.com/sos/mar10/articles/qanda0310_6.htm But I feel like my monitors (HS50M) sound much better horizontal. I can lean forward or back without losing high frequencies.