Parameters Model No.:JQa12 12inch-2way PA/Stage speaker Frequency: 45Hz-20KHz Normal Impedance: 8Ohm SPL 97dB/W/M RMS/Musical/Max.Power: 100W200W/400W Durable scratch-proof paint protection for 15mm MDF wooden cabinet Heavy duty metal handle Steel grill 1.74" Titanium tweeter driver 15inch long-throw composite woofer Size (W*D*H): 43*55*75cm Model No.:JQa15 15inch-2way PA/Stage speaker Frequency: 45Hz-20KHz Normal Impedance: 8Ohm SPL 97dB/W/M RMS/Musical/Max.Power: 200W/400W/800W Durable scratch-proof paint protection for 15mm MDF wooden cabinet Heavy duty metal handle Steel grill 1.74" Titanium tweeter driver 15inch long-throw composite woofer Size (W*D*H): 48×61×83.5cm   Model No.:JQa215 Dual 15inch-2way PA/Stage speaker Frequency: 45Hz-20KHz Normal Impedance: 4Ohm SPL 96dB/W/M RMS/Musical/Max.Power: 400W/800W/1600W Durable scratch-proof paint protection for 15mm MDF wooden cabinet Heavy duty metal handle Steel grill 1.74" Titanium tweeter driver 15inch long-throw composite woofer Size (W*D*H): 48×61×124.5cm Model No.:JQa18SB 18inch PA/Stage subwoofer system Frequency: 45Hz-20KHz Normal Impedance: 4Ohm SPL 96dB/W/M RMS/Musical/Max.Power: 400W/800W/1600W Durable scratch-proof paint protection for 15mm MDF wooden cabinet Internal bracing system for strength construction Heavy duty metal handle Steel grill Metal 35mm Pole mount built-in 18inch high power subwoofer driver Size (W*D*H): 63×62×51.7cm