User manual RANE DC 22

[. . . ] OPERATORS MANUAL DC 22 STEREO COMPRESSOR INPUT GATE -60 -70 -50 -40 -30 -20 -20 -30 -40 -10 COMPRESSOR 0 10 20 1. 7 1. 2 1 :1 RATIO 2 OUTPUT 3 6 24 GAIN REDUCTION BYPASS -6 -12 -15 dB LEVEL 0 6 12 15 MASTER SLAVE INPUT GATE -60 -70 -50 -40 -30 -20 -20 -30 -40 -10 COMPRESSOR 0 10 20 1. 7 1. 2 1 :1 RATIO 2 OUTPUT 3 6 24 GAIN REDUCTION BYPASS -6 -12 -15 dB LEVEL 0 6 12 15 POWER 1 +4 dBu OL 3 2 LINK +4 dBu OL 3 10 12 10 12 DC 22 -80 -80 DYNAMIC CONTROLLER LEVEL dBu THRESHOLD dBu THRESHOLD LEVEL dBu THRESHOLD dBu THRESHOLD QUICK START Shredded, this document makes excellent packing material. In its present form, it makes interesting and useful reading. If you run out of patience quickly, at least read this part to make sure you don't exterminate everything within a two mile radius by doing something wrong. Attach one or two channels of Inputs and Outputs to the respective connectors on the rear. [. . . ] It is a hand on a knob, turning the volume down and turning it up again. The hand is really quick and really accurate, but it's just turning a volume control. When the input signal reaches a level set by the COMPRESSOR THRESHOLD control, the compressor begins turning down the signal by an amount determined by the RATIO control. The DC 22, like most compressors, operates by making the loud signals quieter, but does not make the quiet parts louder. However, by keeping the loud signals under control, the entire system may be turned up when necessary to make the quiet parts louder. PRE-FLIGHT CHECKLIST Before proceeding, it's a good idea to turn the control knobs to the following positions: 1. GATE THRESHOLD control . . . . . fully counterclockwise 2. COMPRESSOR THRESHOLD . . . fully clockwise 3. COMPRESSOR RATIO . . . . . . . . . . . . . . fully counterclockwise 4. BYPASS switches. . . . . . . . . . . . . . . . . . . . . ACTIVE (out) 5. OUTPUT LEVEL . . . . . . . . . . . . . . . . . . . . . . . . 0 dB This renders the DC 22 with no compression, allowing signal through at unity gain. No change occurs with the BYPASS switch in or out. INPUT LEVEL Before making any Threshold adjustments, set the ouput level of the previous device so the +4 dBu LED lights occasionally, and the OL LED does not light. Be aware that changes to the Input Level will affect the Thresholds. GATE THRESHOLD The threshold is the point at which gain adjustment begins. When the input signal is below the threshold, the DC 22 attenuates the signal at a 2:1 ratio, making the quiet parts twice as quiet. When the signal is above the Gate Threshold, the Gate is open, like a straight wire. COMPRESSOR THRESHOLD The threshold is the point at which gain adjustment begins. When the input signal is below the threshold, the Compressor section acts like a straight wire. When the signal is loud enough to cross the Compressor Threshold, the compressor is active and turns the volume down. Various Threshold points are illustrated in Figure 1. How much it gets turned down is determined by the RATIO control ( Figure 1 shows a Ratio set at 2:1). RATIO AUDIO PRECISION 20 10 AMPL(dBr) VS AMPL(dBu) 09 AUG 101 14:34:57 10 0 -10 -20 -30 -40 O0 U T -10 P U -20 T -30 d B -40 u -50 -60 -60 -50 -40 -30 -20 INPUT (dBu) -10 0 10 20 Figure . [. . . ] GUITAR & BASS Where does the unit go in the signal chain?Well, that depends on how you want it to function. If it's a comp/limiter for the input signal, it would go after the guitar (if the guitar has a line-level output) and before the preamp. If it's to function as a limiter to protect the speakers in the rig, it would go after the preamp and before the power amp. [. . . ]