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Summary of Contents for BSS Audio DPR 522
- Page 1 DPR 522 User Manual...
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Page 2: Important Safety Information
IT SHOULD NOT BE NECESSARY TO REMOVE ANY PROTECTIVE EARTH OR SIGNAL CABLE SHIELD CONNECTIONS TO PREVENT GROUND LOOPS. ANY SUCH DISCONNECTIONS ARE OUTSIDE THE RECOMMENDED PRACTISE OF BSS AUDIO AND WILL RENDER ANY EMC OR SAFETY CERTIFICATION VOID. For continued compliance with international EMC legislation ensure that all input and output cables are wired with the cable screen connected to Pin 1 of the XLR connectors and/or the jack plug sleeve. -
Page 3: Table Of Contents
Contents Contents Mechanical installation Mains Power Connection Mains Power Introduction Unpacking Audio Connections Main Inputs Main Outputs Key returns Key send Control Operations Channel In Key filter Width Key listen Ext key Threshold Key level meter Range Attack 6.10 6.11 Hold 6.12 Release... - Page 4 Contents Beginners guide What are gates for? Basic operation General applications Basic gating Frequency conscious gating Ducking Using the Key filter as EQ Warranty Information 10.0 Specifications 11.0 Glossary Index User Notes...
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Page 5: Mechanical Installation
Mechanical Installation Mechanical installation A vertical rack space of 1U (1¾" / 44.5 mm high) is required, with a depth of 190mm. Ventilation gaps are unnecessary (See Figure 1.1). If the unit is likely to undergo extreme vibration through extensive road trucking and touring, it is advisable to support the unit at the rear and/or sides to lessen the stress on the front mounting flange. -
Page 6: Mains Power Connection
Mains Power Connection Mains Power Connection 2.1 Mains Power WARNING! THIS APPLIANCE MUST BE EARTHED. The DPR-522 must always be connected to a 3-wire earthed AC outlet. The rack framework must also be connected to the same grounding circuit. The unit must NOT be operated unless the power cables' EARTH (ground) wire is properly terminated - this is important for personal safety as well as for proper control over the system grounding. -
Page 7: Introduction
Introduction Unpacking Introduction The BSS DPR-522 is a dual channel high performance professional noise gate which has been designed to be simple and intuitive to use. Many of the facilities provided on the unique BSS DPR-502 unit, such as the parametric key filters and key signal metering have been incorporated, with some new features added. - Page 8 The DPR-522 Fig 4.1 Front Panel Fig 4.2 Rear Panel...
- Page 9 All numbers in bubbles refer to Section numbers.
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Page 10: Audio Connections
Audio Connections Audio Connections 5.1 Main Inputs There are 2 input sockets on the rear panel of the 522, Inputs 1 and 2. Each is electronically balanced on standard 3 pin female XLRs at an impedance greater than 10k Ohms. The ‘HOT, + or in phase’ connection is to pin 2 and the ‘COLD, -, or out of phase’... -
Page 11: Key Returns
When using the DPR-522 to drive unbalanced inputs, best performance is usually obtained by connecting the DPR-522s ‘+’ signal to the equipment signal pin and the ‘-’ signal to the equipment shield. Fig 5.4 The DPR-522 shield should normally be connected to the equipment shield, preferably at the equipment end. -
Page 12: Key Send
Audio Connections 5.4 Key send The side chain uses a quasi-balanced ‘ground compensated’ output. When connected to a balanced input, interference rejection equivalent to a fully floating output can be obtained. Full headroom is available into any load of 2k Ohms or greater. The signal ‘HOT, +, or in phase’ signal is to the jack plug tip. -
Page 13: Control Operations
Control operations Control Operations 6.1 Channel In When the CHANNEL IN switch is in the out, non illuminated position, all DPR-522 functions are bypassed and the input is connected directly to the output with a high quality relay. This is the same condition that occurs when the power is off, and ensures that signal is passed through the unit in the case of a power or fuse failure. -
Page 14: Key Listen
Control operations This type of filter not only allows band-pass configurations, but also, by the appropriate setting of the KEY FILTER and WIDTH controls, the conventional low pass or high pass configurations can be easily realised. Experience will show that this approach gives considerable operational advantages for the user over the more simple separate low/high pass filter approach. -
Page 15: Key Level Meter
In normal use the threshold control is generally set so that wanted signal peaks are just able to trigger the gate, this gives the maximum protection from false triggering by undesired signals. 6.7 Key level meter The relationship between the actual trigger signal (as set by the threshold control) to the gate trigger point is displayed on the KEY LEVEL METER. -
Page 16: Attack
Control operations 6.9 Attack Once the key level exceeds the threshold, the gate will start to open. The time it takes to open is set with the ATTACK control. For conventional gating, fast attack settings are usually desired to ensure that the minimum wanted program is lost. -
Page 17: Hold
6.11 Hold After the attack time is completed, the DPR-522 keeps the gate fully open for a time determined by the HOLD control. Hold is required to avoid the DPR- 522 from starting another attack sequence if the key signal momentarily falls below the threshold level. -
Page 18: Duck Mode
Control operations 6.14 Duck mode Normally the DPR-522 would be configured as a gate, that is to say that the signal will be ‘cut off’ unless triggered, whereupon the signal will be passed through. DUCK MODE forces the opposite to happen; i.e. when there is NO trigger event (signal above threshold or DC/switch trigger) the DPR-522 will pass signals. -
Page 19: Gate Open Indicator
6.16 Gate open indicator If the gate is not passing program, the SHUT LED is illuminated. If it is passing program, the OPEN LED is illuminated. These LEDs fade from one to another during the attack and release times, their relative intensity gives a visual indication of the dynamic response of the gating action. -
Page 20: Key Send Connector
Control operations 6.17 Key send connector This is a ‘pseudo balanced’ output and carries a buffered version of the signal applied to the MAIN input. It may be used as such, or can be connected to the input of external equipment for further processing. Refer to section 5.1 for the wiring details of this connector. - Page 21 Pin 1 GATE OPEN Output An open collector output that goes LOW when the DPR-522 is passing signals. If an external pullup is used, limit the current passed by this pin to below 50mA at a voltage no higher than 25V. If desired this pin can be connected to an internal pullup on pin 4 to provide a signal that swings positive to +15V when the DPR-522 is not passing signals.
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Page 22: Beginners Guide
Beginners guide Beginners guide 7.1 What are gates Put simply, a noise gate is a device that blocks or switches off a signal if that signal falls below a certain preset level. Originally noise gates were used for for? just that, gating or removing noise from recordings. For example traffic rumble in studios, or electronic noise from old tape loop echo chambers. -
Page 23: Basic Operation
In operation, the DPR-522 can be considered as an automatic on-off switch that is placed into the program signal line, the actual operation of the switch being controlled by the loudness level of the signal. The simplest way to understand the basic operation is to connect one gate channel into a program source and operate the controls whilst listening to their effect. -
Page 24: General Applications
General applications General applications 8.1 Basic gating Rotate the THRESHOLD control to the OUT position, apply a signal to the MAIN input and observe that there is no output. Rotating the THRESHOLD control anticlockwise, you should see some indication on the KEY LEVEL meter. -
Page 25: Ducking
8.3 Ducking For this example, a DJ ‘talkover’ application will be described. Apply the program that you wish to ‘duck’ to the MAIN input. Apply the DJ program that you want to cause the ducking action to the KEY RETURN input. Remember that if you wish to use a microphone as this signal, it may need amplifying first. -
Page 26: Warranty Information
Warranty Info Warranty Information When sold to an end user by BSS Audio or a BSS Audio Authorised Reseller, this unit is warranted by the seller to the purchaser against defects in workmanship and the materials used in its manufacture for a period of one year from the date of sale. -
Page 27: Specifications
Specifications 10.0 Specifications General Input Impedance 10k ohm balanced or unbalanced Input Headroom >+20dBu Input CMRR >-50dB (30Hz-20kHz) Max Output level >+20dBu into 600 ohms or greater Output Impedance <50 Ohms unbalanced or unbalanced Frequency Response 10Hz-80kHz (+/-3dB) Noise -96dBu (22Hz to 22kHz) Dynamic Range >117dB Cross Talk >-85dB (20Hz to 20kHz) Distortion <0.005%THD (80kHz measurement BW) 20Hz-20kHz. -
Page 28: Glossary
Glossary 11.0 Glossary Active Active electronic circuits are those which are capable of voltage and power gain by using transistors and integrated circuits. A special BSS feature that can be used to impart a new leading edge transient on sounds to make them sound less 'gated' and more punchy. Amplitude Refers to the voltage level or intensity of a signal, and is usually measured in voltage or decibels. - Page 29 Drop-in A term used to describe the way in which new equipment, or a hitherto unused function of equipment already connected, can be switched into a live sound system without causing unwanted effects, i.e: without causing clicks or a noticable change in sound level. Duck The term given to a unit that attenuates the program when another signal exceeds a threshold level.
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Page 30: Index
Index Index Earthing Applications Basic gating using the Key filter as Ducking Ext key Frequency conscious gating Using the Key filter as EQ Attack Frequency conscious gating Audio connections Front Panel Inputs 10, 13, 22 Fuse rating Key return Key send Outputs Gate open Glossary... - Page 31 Rack space Range Rear Panel Release Specifications Stereo link Threshold Unpacking Voltage selection Warranty Width...
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Page 32: User Notes
User Notes... - Page 34 User Notes...
- Page 36 User Notes...
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