Portable pa system with wireless microphones qtx sound 178 846 a self contained portable power amplifier unit operating from either mains power or internal re chargeable battery that drives a 38cm 15in main driver and 2 5cm 1in compression driven horn unit br br this pa system also includes a pair of vhf handheld wireless microphones with the receiver built into the mixer amp section at the rear along with two further mic inputs with echo auxiliary line input and integral usb sd m