Review on 🔊 Douk Audio G4 Subwoofer Monoblock Power Amplifier with 100W Full-Frequency Digital Output by Steve Willis

Wanted to find a mono amp for my old Velodyne subwoofer. I disconnected the power supply and the internal amplifier when both failed. I wanted to free up an old 220W Kenwood for my surround speakers. The subwoofer worked with a loudspeaker membrane, which was connected directly to the amplifier with wire clamps. This product arrived with no instructions and I couldn't find them on their website. I connected a subwoofer to my Denon receiver, connected this amp to the subwoofer and turned it on. It worked for about ten minutes, then the speaker cone started banging on the frame basket again. Douk's audio support was woefully inadequate! They kept saying they couldn't understand my connection to the subwoofer. I tried using a different speaker and got the same results! I couldn't even turn the volume up and the speaker started banging loudly. The product was defective, which I have told them on numerous occasions! THEY HAVE NOT! Suggest replacing it. I will be returning this amp asap! By the way, Fosi products look the same as DoukAudio amplifiers.