I know what 5.1 is and where the speakers go. I know what DD 5.1 EX is I know what THX 5.1 EX is I know what dts 5.1 ES is I know what dts 6.1 ES is In fact I am very excited to say that my receiver does them all. Can somebody please explain to me what 7.1 is and where the speakers go ? Does 7.1 have a centre rear channel ? Is it 2 channels of side effects ? What are side effects and are they full range ? Is it 1 channel of centre rear and 1 channel of side effects driving 2 speakers ? Have any movies in the Cinemas ever been shown with it ?