Singtronic carries high quality karaoke mixing amplifiers & power mixer amplifiers online at the lowest price, Guaranteed! Please check out our best selling karaoke mixing amplifiers on sale now! A karaoke amplifier is a powered amplifier designed specifically for the needs of the avid karaoke equipment owner. ... This eliminates the need for a mixer if you have two audio sources, such as the karaoke source and an iPod for filler music.