The QX Series of SOLTON amplifiers are professional tools designed and built for portable PA applications. The series includes three models which are identical except for output power: QX 700, QX 1600 and QX 2400. All are rugged and offer unmatched value in their class. 1600 and 2400 -Series amplifiers feature a variable crossover frequency and proportional-speed fan-assisted cooling, XLR inputs, speak and clamp outputs. Short-circuit protection and more.