Abstract: A sound source processing apparatus uses a magnetic drum to prevent sound quality deterioration and amplify the volume of sound when a sound source transmitted from a primary acoustic device is outputted. The apparatus receives, through an input end, a sound source outputted from the primary acoustic device, records the inputted sound source on a recording part (a magnetic coating surface) of the magnetic drum in a magnetic drum recorder, reproduces, in real time, the sound source recorded on the magnetic drum, and then amplifies it, sequentially passing the amplified sound source through a pre-amplifier and a power amplifier to amplify output and then sending it to a speaker. To prevent sound quality deterioration for repetitive playback, interaction caused by contact between sound sources is removed. Amplifying the volume of sound outputted in real time using the magnetic drum promotes enhanced sound quality.