Without knowing exactly what speakers you are using generally the "SA" speakers will work just fine assuming they are monopole - there's not a whole lot of information being sent to the surround back channel. Keep in mind that a using a single surround back speaker can have imaging problems, it's better to go 7.1 and use 2 surround back speakers. Most 6.1 receivers will drive 2 speakers on the surround back channel
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