The function of compressor is to automatically reduce the level of peaks signal so that the overall dynamic range turn out better. Compression or limiting enables even the quietest sections to be made significantly louder while the overall peak level of the material is increases only minimally. In the digital age, the compressor offers great benefits and is especially important in recordings. It’s helps ensure that the signal is encoded at the highest possible level and offers a better signal definition. Other question, it helps to prevent a particularly harsh type of distortion known as “clipping”. This is one kind of limitations of digital technology.

RATIO selector allow four different modes:
4:1 (moderate compression)
8:1 (midd-hard compression)
12:1 ( best use to mild limiting)
20:1 ( best use to hard limiting)

It’s necessary to remember that a ratio of 4:1, however, means that any time there is an increase of 4 decibels in the loudness of the input signal, there will only be a 1db increase in output signal.

The decibel is a logarithmic form of measurement. Approximately 10db is normally required to increased the gain for a signal to sound twice as loud.