^^ Why are sub amps so cheap? That would be my take. There are stereo amplifiers that can cost thousands of dollars or tens of thousands of dollars. Companies that go under aren’t caused by one type of mishap (like a rash of bad amps), but by many blunders, including not having enough financial backing to weather the many storms ahead.
Music area: Magnepan 3.6, McIntosh MC2205 amp & C48 preamp, SVS SB13-Ultra, Oppo BDP 95, dbx 3BX, and assorted equipment.
Movie area: EMP Tek E5Bi (were rebadged to R5Bi), RBH/EMP Tek R55Ti, PSA S3000i, Denon X2000, Oppo BDP 83.