YAMAHA XMV4280-D Power Amplifier – Working. You will receive 1 x Yamaha XMV4280-D Power Amplifier in used condition. 1 x UK Power Cable. Note: This device will show wear and tear. The professional amplifier it is in working condition. 4x 280W at 8? /4? 4x 250W at 100V/70V lines. 2x 560W at Double Power Mode (8? /4?).