LEVEL +4 dBu OL 1 INPUT -20 -30 -40 dBu THRESHOLD -80 -70 -60 -50 GATE 20 0 10 1 1.2 1.7 :1 RATIO 2 6 3 ∞ GAIN REDUCTION 24 10 12 3 COMPRESSOR dBu THRESHOLD -40 -30 -20 -10 BYPASS -15 -12 -6 dB LEVEL 0 15 12 6 OUTPUT MASTER SLAVE LINK LEVEL +4 dBu OL 2 INPUT -20 -30 -40 dBu THRESHOLD -80 -70 -60 -50 GATE 10 20 0 1 1.2 1.
IMPORTANT SAFETY INSTRUCTIONS 1. Read these instructions. 2. Keep these instructions. 3. Heed all warnings. 4. Follow all instructions. 5. Do not use this apparatus near water. 6. Clean only with a dry cloth. 7. Do not block any ventilation openings. Install in accordance with manufacturer’s instructions. 8. Do not install near any heat sources such as radiators, registers, stoves, or other apparatus (including amplifiers) that produce heat. 9.
OPERATORS MANUAL DC 22 STEREO COMPRESSOR INPUT 1 GATE -60 -70 +4 dBu OL LEVEL -80 -50 COMPRESSOR -40 -30 -20 dBu THRESHOLD -20 -10 0 -30 -40 1.7 10 20 dBu THRESHOLD 2 ∞ 1 :1 RATIO INPUT 0 2 -6 6 -12 10 12 1.2 OUTPUT 3 3 24 GAIN REDUCTION 12 -15 BYPASS 6 LINK dB LEVEL -70 +4 dBu OL 15 MASTER SLAVE GATE -60 LEVEL -80 -50 COMPRESSOR -40 -30 -20 dBu THRESHOLD -20 -30 -40 -10 0 1.
Front Panel Description INPUT INPUT LEVEL indicators: With signal applied, the +4 dBu LED may light occasionally. If the OL (overload) LED flashes, turn the output level down on the previous device. GATE 1 -60 -50 -70 +4 dBu OL GATE THRESHOLD control sets the point at which the Input signal level causes the Gate to become active.
WIRING OUTPUT 1 3-PIN XLR: PIN 1 = CHASSIS, SHIELD, PIN 2 = (+), PIN 3 = (–) INPUT 1 ¼" PHONE, BALANCED: TIP = (+), RING = (–), SLEEVE = CHASSIS, SHIELD ¼" PHONE, UNBALANCED: TIP = SIGNAL, RING = GROUND, SLEEVE = CHASSIS, SHIELD BALANCED UNBAL -10 dBV BAL/UNBAL +4 dBu BALANCED INPUTS 1 and 2: Choose between the balanced XLR or the balanced/unbalanced ¼" TRS jacks, but only use one.
OPERATING INSTRUCTIONS A PRIMER Let’s start with what a compressor actually does. No matter how you cut it, this is an automatic volume control. 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.
LIMITING A limiter is a special form of compressor set up especially to reduce peaks for overload protection. In other words, it’s a compressor with a maximum ratio. A compressor is used to change the dynamics for purposes of aesthetics, intelligibility, recording or broadcast limitations. Once the threshold of a limiter is reached, no more signal increase is allowed. The DC 22 acts as a limiter when set at a very high ratio of 10:1.
DRIVER PROTECTION FINE TUNING 1. Determine the driver’s maximum continuous average power rating in watts (W) (specified by the manufacturer). 2. Determine the driver impedance “z” in ohms (specified by the manufacturer). 3. Using the data in steps (1) and (2) above, calculate the maximum signal level in dBu that the driver can handle. Max dBu = 20*log(√ (w*z)/.775). 4. Determine the gain of the amplifier in dB (if the amplifier has a level control , you may wish to measure the gain). If, i.e.
