dbx Pro 4820, 4800 manual Compressor Insert, Compressor On/Off switch, OverEasy fader, Ratio fader

DriveRack® Detailed Parameters Section 6

6.14 - Compressor Insert

The DriveRack 4800 and 4820 offer an Insert Compression function on both the Input and Output Inserts. This function is modeled from classic dbx Compressors such as the 160 and the 165.

Compressor On/Off switch

This switch turns the Compressor module on and off.

OverEasy fader

OverEasy is a characteristic of dbx Compressors and is essentially a “soft-knee” function that occurs at about the compression threshold. On analog dbx Compressors, OverEasy could only be turned on or off, but in the digital domain this parameter can have a range. This parameter can be adjusted between 0 and 10 where 0 corresponds to no OverEasy, and 10 corresponds to a very wide soft-knee region. To match the response of the classic dbx 160, an OverEasy of 6 is recommended.

Threshold fader

The Threshold is the signal level at which the unit begins to compress the signal. If the level is set to -10 dBFS, then any signal larger than -10 dBFS is compressed, and any signal that has a level that is lower than -10dBFS is not. For most signals the most natural sound is achieved when most of the signal content remains just below the Threshold and only the peaks cross the Threshold. The range of the Threshold fader is -60 to 0dBFS.

Ratio fader

The Ratio is the rate at which the signal is reduced once the threshold is crossed. A 2:1 ratio means that if the incoming signal is 2dB over the threshold, the unit will compress the signal, and output a signal that only goes 1dB over the threshold. Setting the Ratio at Inf:1 makes the compressor act as a limiter. The range of the Ratio parameter is from 1:1 to Inf:1.

Gain fader

This parameter, often called make-up gain, is used to compensate for the gain lost during compression. The range of the make up gain parameter is -20 to +20dB.

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DriveRack® 4800/4820 User Manual 55