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 : Amazon.co.uk: Electronics & Photo
Timpano TPT-500.4 2Ω Compact 4 Channel Amplifier 500W Car Audio Digital Amp 611056239438 | eBay
MTX MUD100.4 Mud Series 400 Watt RMS 4 Channel Class D Compact Weatherproof Outdoor Powersports ATV UTV Motorcycle Sound System Stereo Amplifier Kit : Amazon.co.uk: Automotive
Sony XMS400D compact 4-channel car amplifier | Crutchfield video - YouTube
Vibe Powerbox 65.4M-V7 520 Watt Micro Compact Class D 4 Channel Speaker Amplifier