Congratulations on choosing the dbx Model 163X OverEasy Compressor/Limiter. We recommend that you take a moment and read through the manual as it provides information that will assist you in using your unit to its fullest potential. The dbx 163X provides traditional dbx sonic quality and performance for the working musician, DJ, studio operator or anyone who needs a friendly compressor/limiter/preamp. The 163X incorporates dbx OverEasy compression with soft knee threshold, a patented dbx VCA and human-ear compatible true RMS detection. Key operating parameters are integrated and controlled by a single front panel slide control. After a simple level-set adjustment, the desired amount of compression can be rapidly and easily set or adjusted with the slider — without requiring the adjustment of separate Threshold, Ratio and Output controls as found on conventional compressors. Front panel inputs allow quick and complete system hookup and operation that can be switched over to instrument or microphone just by “plugging in” to the front panel. This front panel Hi-Z input includes a preamp (with rear panel trim) for bass, guitar, synthesizer or other Hi-Z devices, including a Hi-Z mic (or Lo-Z mic with appropriate transformer). The standard input and output jacks on the rear panel are designed for operation at line levels from -30dBu to +10dBu.