Gap-d2400 Professional 600w*4 Power Amp 1u Class D Sound Digital Power Amplifier - Tool Parts - AliExpress
Crown XTi 4002 Power amplifier — 650W x 2 at 8 ohms, 3,200W x 1 at 4 ohms bridged at Crutchfield
Amazon.com: Pyle Wireless Bluetooth Stereo Power Amplifier - 200W Dual Channel Sound Audio Stereo Receiver w/RCA, USB, SD, MIC in, FM Radio, for Home Computer via RCA - PDA29BU.5 : Electronics