Your receiver will have the range mentioned. There is no harm in mixing speaker impedances while being within the receiver range. 6 and 8 ohm are usually not an issue.Have u tried Boston A23 ever or listened it anywhere? And 1 more thing that Can I mix a pair of 6 ohm speakers(surround) with a pair of 8ohm speakers ( back surround)? Would this mixture affect my receiver
MaSh