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If you are going to get either model, make sure that your speakers are around 8 to 16 ohms as Pioneer does not recommend using speakers of lower impedance

Niel, The 811s also has support for 7.1 by splitting the surround back channel into 2 speakers. The reciver has inputs for both speakers. It also has pre-outs for amplifiers. The 811 is more future proof IMHO. If you don't want these features then go ahead with the 711.