Wayne Parham Messages: 18752 Registered: January 2001
Illuminati (33rd Degree)
It doesn't matter what direction you face subs if they are crossed over below 80Hz or so. But if they are run higher than that - and you need the upper-end response - then orientation can matter. The only times I would want subs run high are when they are used as flanking subs.
I think you might be interested in reading about multisubs and flanking subs. Click the link below to search this site, and maybe even search the rest of the internet for more information on those configurations.