Fosi Audio
Fosi Audio ZA3 Balanced Stereo Amplifier Home Audio Component Mini 2 Channel Mono Amp TPA3255 for Subwoofer Desktop Home Theater Bookshelf Tower Floorstanding Passive Speakers with 48V Power Supply
Orion
ORION Cobalt CBT-2000.1D Class D Mono 1 OHM Channel Amplifier 2000 Watts Max Music Power