AVS Special Member
Join Date: Aug 2004
Location: sierra ecuadoriana
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5.1 and 3/2.1 are the same thing. The "3" refers to the LCRs and the "2" is the surround channels and of coarse, the .1 is the sub. Older gear, like my Marantz 880 AVR showed 3/2.1 Newer gear shows 5.1
If you see just "Dolby Surround" it would be pro logic.
Dolby Digital can be anything from 2.0 ~ 5.1
Dolby Digital EX is 7.1
Custom, one of a kind pair, MJC212 mains, mod PT800 center, PT800 surrounds, SUB1500s. Parasound P7, Citation 19, Parasound HCA2205A, HK AVR3600, Marantz TT, Denon disc player, MacBook Pro w/ DragonFly usbDAC.