Speaker wire is dependent on the length of the run to the speaker and the quality of the sound you want from the speakers. You can spend thousands of dollars on exotic speaker wires for a little definition in the sound. The manual states that up to 20 ft an 18 gauge wire is fine with 16 and 14 gauge for longer runs. I would buy the lower gauge and put connectors on the ends for general use and if you are not a critical listener then the 18 gauge is probably just fine.