Polar diagram acoustical noise sources Models: S103 AC / S103AC-DC / LS03 / LS04 / (LOW-MID FREQUENCIEES)Models: S103 AC / S103AC-DC / LS03 / LS04 / (MID-HIGH FREQUENCIES) Polar diagram acoustical noise sources Model: S203 / S303 / S204 / S304 / LS03 / LS04 (LOW-MID FREQUENCIEES) Model: S203 / S303 / S204 / S304 / LS03 / LS04 (MID-HIGH FREQUENCIES)