Designed to hook up a turntable to an audio system. Designed to convert the signal from your magnetic cartridge on a turntable to AUX input located on an amplifier. the normally weak turntable signal will be amplified to be compatible with the AUX input (350mv). The AP-25 can be used to convert most AUX inputs normally found on audio amplifiers and mini sound systems. It is a necessary component for the transfer of vinyl records to CDs using a computer's CD burner (specific software may be required).