Amazon.com: Timpano Compact 4 Channel Amplifier Car Audio 500 Watt, 4 x 125 Watts at 2 Ohms, Mini Stereo 12 volts Full Range Class D Amp, Bridgeable Amplifier 4 Channels TPT-500.4 : Electronics
Ultimate Audio - Just in..... Sony High Power bluetooth reciever with 100 watt X 4 built in amplifier. No need for a separate 4 channel amp, this is an all in one reciever. | Facebook
AC3/AC8 Antenna Distributor Wireless Monitor System Professional Stage Antenna Combiner Amplifier,UHF 4 Channels 500-950MHz - AliExpress