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MODEL 160A
COMPRESSOR
LIMITER
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IMPORTANT SAFETY INFORMATION WARNING FOR YOUR PROTECTION CAUTION READ THE FOLLOWING: RISK OF ELECTRIC SHOCK KEEP THESE INSTRUCTIONS DO NOT OPEN ATTENTION: RISQUE DE CHOC ELECTRIQUE - NE PAS OUVRIR HEED ALL WARNINGS WARNING: TO REDUCE THE RISK OF FIRE OR ELECTRIC FOLLOW ALL INSTRUCTIONS SHOCK DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE THE APPARATUS SHALL NOT bE ExPOSED TO DRIPPING OR SPLASHING LIqUID AND NO ObjECT FILLED WITHI LIqUID , SUCH AS vASES, SHALL the symbols shown above are inte
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IMPORTANT SAFETY INFORMATION L e ectroMaGInet c DL ec Itara on of MP co IBILI ta ty conforMIty manufacturer’s Name: dbx professional products this unit conforms to the product specifications noted on the manufacturer’s Address: 8760 s. sandy parkway sandy, utah 84070, usA Declaration of Conformity. operation is subject to the following two conditions: declares that the product: product name: dbx 160A • this device may not cause har mful interference, and Note: product name may be suffi
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dbx 160A COMPRESSOR / LIMITER Manual Contents QC ui k s et -u p . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 i nspeCtion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 i ntroduCtion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 a ppliCtionsa . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Otingpera Controls
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dbx 160A COMPRESSOR / LIMITER QUICK SETUP To get your unit up and running as quickly as possible, do the following steps . For more detailed information, refer to the specified pages . • Unpack and Inspect the 160A Package. • Set Levels and Controls as Needed. • Connect the 160A to Your System. INSPECTION Verify that the 160A package contains the following: • 160A Unit • AC Power Cord • Operation Manual (including Registration Card) INTRODUCTION Congratulations on purchasing the dbx 160A
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dbx 160A COMPRESSOR / LIMITER APPLICATIONS The dbx 160A is capable of handling a wide range of applications. In the studio, the 160A can be used on everything from vocals to percussion. In live sound reinforcement, the 160A can allow the engineer to get that “fat studio sound” out of the drum kit or provide protection limiting for the speakers. It is also an excellent line driver, perfect for sending signals down long cables to power amp stacks or from remote broadcast trucks. In radio or t
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dbx 160A COMPRESSOR / LIMITER 1:1 Unity 1:1 +20 RED +20 Above Threshold +15 +15 2:1 2:1 +10 +10 4:1 4:1 +5 +5 20:1 0 :1 :1 0 RED Rotation Point Threshold -5 Above Threshold −5 -10 OverEasy Range −10 GREEN Below Threshold -15 − 15 Below Threshold -15 -10 -5 0 +5 +10 +15 +20 − − − +20 15 10 5 0 +5 +10 +15 INPUT LEVEL (dB) INPUT LEVEL (dB) Figure 2: OverEasy® Compression Curve Figure 1: Hard Knee Compression Curve and threshold LEDs and threshold LEDs OUTPUT GAIN Control: Adjus
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dbx 160A COMPRESSOR / LIMITER +24dBu. This jack accepts 1/4” phone plugs. In normal operation the TRS phone jack is internally wired with the TIP HOT (+), and the RING and SLEEVE connected to ground. In Bypass mode, however, the RING is connected to the COLD (-) leads of the input jacks, to allow for balanced connections. GROUND (GND) Lift Switch: This switch allows for troubleshooting hum (line interference) caused by ground loops. In the “GND” position, pin 1 of the input XLR-type jack is
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dbx 160A COMPRESSOR / LIMITER ∞ − 1:1 − +20 − +15 2:1 +10 4:1 +5 :1 ∞ 0 -5 Threshold -10 -15 −1:1 -15 -10 -5 0 +5 +10 +15 +20 INPUT LEVEL (dB) Figure 3: Ratio Control and Infinity+ (Negative) Ratios 160A by 1dB. See Figure 3 above. The control curve of the RATIO potentiometer has been designed to provide total oper- ator control, with scale expansion at the subtle lower ratios for easy, repeatable settings. METER CALIBRATION Control: The INPUT/OUTPUT LEVEL display in the 160A is factory-cal
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dbx 160A COMPRESSOR / LIMITER Negative ratios can also be used to prevent musicians from continually increasing the volume of their instrument (e.g., in live applications where there is no sound engineer to control the house levels). With their signal compressed by a neg- ative COMPRESSION RATIO, each volume increase initiated at the instrument or amp would actually decrease the volume level at the final mix. Fattening Kick Drums and Compressing Other Drums Weak, flabby kick drums often have
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dbx 160A COMPRESSOR / LIMITER As a general rule, compressors should be as close to the amplifiers as possible in the signal chain. If the 160A is placed before the EQ (equalizer), for example, a potentially damaging boost in the EQ won't be seen by the 160A and the speakers may be damaged. (see Multi-way speaker systems, page 9.) For maximum sound pressure levels, large sound reinforce- ment systems frequently use a separate compressor on each output of the electronic crossover(s). For a st
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dbx 160A COMPRESSOR / LIMITER The converse of the above EQ technique may be used: dipping the equalizer bands causes any sound with dominant energy in the affected register to pull the level up because the 160A will detect a need for less compression. De-Essing To apply de-essing to vocals (i.e., a reduction of sibilance), use a parametric equalizer in the level detector circuit and set it for high frequency boost in the specific frequency range where the vocal “hiss” or lisp occurs (general
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-10 4:1 0 3:1 6:1 dbx 160A COMPRESSOR / LIMITER INPUT -20 0 BELOW ABOVE 10:1 LEVEL -10 +10 :1 2:1 OUTPUT -40 30 20 15 10 865432101246 10 20+ BYPASS SLAVE OVEREASY -30 +10 -5:1 GAIN REDUCTION -2:1 160A -40dBu +20dBu 1:1 -1:1 -20dB +20dB COMPRESSOR/LIMITER THRESHOLD COMPRESSION OUTPUT CONNECTING THE 160A TO YOUR SYSTEM RATIO GAIN DISPLAY 85-3999-A 160AD front buyoff (5-20-98) Basic Connection 15 WATTS MANUFACTURED UNDER ONE OR MORE OF THE FOLLOWING U.S. PATENTS 4,234,804 4,316,107 4,329,598 4,33
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dbx 160A COMPRESSOR / LIMITER “MASTER” “SLAVE” 160A 160A INPUTOUTPUT INPUTOUTPUT STEREO STEREO STRAPPING STRAPPING TO RIGHT INPUT TO LEFT INPUT FROM RIGHT OUTPUT FROM LEFT OUTPUT TRS “STEREO” CABLE (Shield plus two conductors) Figure 6: Multi-Channel Connections Using External Level Detector Inputs To control the compressor by signals other than the audio input (via an auxiliary device), connect the auxiliary device's output to the 160A's DETECTOR INPUT jack, and feed the auxiliary device's
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dbx 160A COMPRESSOR / LIMITER Note: DO NOT CONNECT the output of a power amp or the speaker out of an instrument to the input of the 160A. Severe damage to system components may result. Patch Bay In the studio, the 160A may be connected to a patch bay to allow it to be used anywhere in the studio system. If your studio is not fully balanced, you must ground the unused XLR pin (either pin 2 or 3) or use the 1/4” phone jack OUTPUT, which is single-ended. Another option is to have a qualified
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dbx 160A COMPRESSOR / LIMITER Grounding For maximum hum rejection with a balanced source, avoid common grounding at the 160A's input and output. Most bal- anced (3-conductor) cables have the shield connected at both ends. This can result in ground loops which cause hum. If hum is a problem, try changing the position of the rear panel GROUND LIFT switch. This switch disconnects the input XLR pin 1 (the shield) from the 160A's chassis ground. We advise starting with the switch in the LIFT posi
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dbx 160A COMPRESSOR / LIMITER SPECIFICATIONS Input (1/4” TRS Phone and XLR) Floating Balanced; XLR: Pin 2 Hot, Phone: Tip Hot Impedance 100kΩ balanced, 50kΩ unbalanced Maximum Level +24dBu, Balanced or Unbalanced CMRR >45dB (any frequency) Detector Input (1/4” TRS Phone) Floating Balanced Impedance 400kΩ balanced, 200kΩ unbalanced Maximum Level +28dBu, Balanced or Unbalanced Output (XLR) Floating Balanced; Pin 2 Hot Impedance 30Ω Maximum Level (Balanced) + 24dBm
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dbx 160A COMPRESSOR / LIMITER NOTES 15
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8760 South Sandy Pkwy. Sandy, Utah 84070 Phone: (801) 568-7660 Fax: (801) 568-7662 Questions or comments? E•mail us at: customer@dbxpro.com or visit our World Wide Web home page at: www.dbxpro.com 18-2040V-C 12/08/10 Printed in China
