If the speakers are to the sides, then they would be "surround", not "surround back". Check out the Speaker Placement page in the manual (page 11 in my 1400 manual).
For stereo, Pro Logic, and Pro Logic II material, I use DTS Neo:6 Cinema (VCR, PlayStation2, etc.)
For Dolby Digital material, I use Dolby Digital Surround Standard (DVD, DTV, XBox, etc.)
For Dolby Digital EX material, I use Dolby Digital EX Surround Standard (don't think I have anything with this)
For DTS material, I use DTS Surround Standard (GTA:VC on PS2 actually, DVD, etc.).
For DTS ES material, I use DTS ES Surround Standard (LoTR DVDs, etc.)
I played briefly with the Surround Enhanced and THX modes, but leave it in Standard these days. Check out the Sound Field Program Descriptions for movie/video sources pages in the manual (pages 41-42 in my 1400 manual).
For stereo, Pro Logic, and Pro Logic II material, I use DTS Neo:6 Cinema (VCR, PlayStation2, etc.)
For Dolby Digital material, I use Dolby Digital Surround Standard (DVD, DTV, XBox, etc.)
For Dolby Digital EX material, I use Dolby Digital EX Surround Standard (don't think I have anything with this)
For DTS material, I use DTS Surround Standard (GTA:VC on PS2 actually, DVD, etc.).
For DTS ES material, I use DTS ES Surround Standard (LoTR DVDs, etc.)
I played briefly with the Surround Enhanced and THX modes, but leave it in Standard these days. Check out the Sound Field Program Descriptions for movie/video sources pages in the manual (pages 41-42 in my 1400 manual).