The SYBA SD-DAC63016 3 band tone control Pre-Amp with built in headphone amplifier is different from many audiophile designs for its unique 3-band "Tri Tone" equalizer while most of the Hi-Fi equipment has forgotten for many years. The Tone Control allows the audiences to master their song back to "Original" even they are playing with a lower quality MP3 files on a middle-end earphone, or they might enhance different parts of frequency range; high tones (Treble), mid-range (Middle), low frequency (Bass), in order to suit their personal taste for different kinds of music, such as, Classic, Jazz, Pops music, which also bring back the vintage feelings for that they might be able to tailor to their preference on what they are listening to, and it is found to be a common practice between 70's and 80's.