... 3, Warranty: 3 years Naphon KTV Amplifier Karaoke Amplifier KA-250 Detailed Product Description1, 2x250W2, 25Hz~18KHz3, Warranty: 3 years Features ... : KA-250 series amplifier have reliable quality, best tone. Powerful power,auto ... +/-8db;2KHz+/-12dbDimension420x380x135 mm Naphon KTV Amplifier Karaoke Amplifier KA-250