We recommend that you get stranded cable that is specifically designed for use with speakers, not just lamp cord or (heaven forbid) telephone wire. Your choice of wire can effect the sound quality of your system and we recommend better-quality branded wire. For connecting lengths less than 7.5 metres, use either 18 or 16 gauge. For connection lengths greater than 7.5 metres but less than 15 metres, use either 16 or 14. For greater than 15 metres, use 14 or 12.