... .Hot 4.1 amplifier speaker 2.4.1ch circuit design 3.USB,SD,FM function 4.OEM service 5.VFD display New ... design 4.1 amplifier speaker 1.Hot 4.1 speaker , solemn and delicate overlook, both main and vice cabinets are ... , high intensity, effectively eliminate resonance and cabinet noise5. With Standby,Input,Menu,VOL+,VOL- keys on the front panel. Output power20W+8W*4 ...