Sony str-da5500es User Guide

This receiver allows you to use a 7.1 channel system (7 speakers and one subwoofer).

To fully enjoy theater-like multi-channel 
surround sound requires five speakers (two 
front speakers, a center speaker, and two 
surround speakers) and a subwoofer (5.1 
channel system). 

AFront left speaker
BFront right speaker
CCenter speaker
DSurround left speaker
ESurround right speaker
HSubwoofer

You can enjoy high fidelity reproduction of 
DVD or Blu-ray Disc software recorded sound 
in the Surround EX format if you connect one 
additional surround back speaker (6.1 channel 
system) or two surround back speakers (7.1 
channel system)

.

AFront left speaker
BFront right speaker
CCenter speaker
DSurround left speaker
ESurround right speaker
FSurround back left speaker
GSurround back right speaker
HSubwoofer