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DPR-901ii
User's Manual
This Manual is the COPYRIGHT of BSS Audio. All reproduction and copying, other than for the legal
owner's personal use, or disclosure of part or whole to a third party, without prior written authorisa-
tion, is in violation of the European Copyright Convention. BSS Audio 1995
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Table of Contents
Related Manuals for BSS Audio DPR-901ii
Summary of Contents for BSS Audio DPR-901ii
- Page 1 DPR-901ii User's Manual This Manual is the COPYRIGHT of BSS Audio. All reproduction and copying, other than for the legal owner's personal use, or disclosure of part or whole to a third party, without prior written authorisa- tion, is in violation of the European Copyright Convention. BSS Audio 1995...
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Page 2: Parametric Equalisation
DPR-901ii Welcome V1.1 9 August 1995 Welcome to the DPR-901ii Users Manual DPR-901ii ABOVE AND BELOW THRESHOLD DYNAMIC PARAMETRIC EQUALISATION. This manual is provided with the aim of assisting sound engineers, producers, musicians, system installers and consultants to fully under- stand the DPR-901ii, and to benefit from it’s maximum capability. -
Page 3: Table Of Contents
Table Of Contents Table Of Contents Introduction Features and Facilities Installation Unpacking Mechanical Installation Mains Power Voltage Setting Safety Earthing AC Power Fusing Audio Connections Ground Loop Control Controls Principle of operation Using the DPR-901ii Warranty Information Appendix A Chassis/0v Link Removal Input pin 1 to Chassis Connection Transient Suppressor Replacement Appendix B... -
Page 4: Introduction
DPR-901ii Introduction Introduction Congratulations!. Whether you’re a sound engineer, producer, consult- ant, installer or musician, you’ve just added a powerful new weapon to your audio armoury. The DPR-901ii is a new class of audio equaliser. Both subtle and power- ful, it builds on the established problem solving capabilities of paramet- ric equalisers. -
Page 5: Features And Facilities
! ! ! ! ! To correct for and/or guard against, bad microphone technique (by unskilled performers). And in common with other units in BSS Audio’s processor range, the DPR-901ii features: ! ! ! ! ! Friendly rotary control knobs for all parameter adjustments. -
Page 6: Installation
Mechanical Installation Installation 2.1 Unpacking As part of BSS AUDIO’s system of quality control, this product is carefully checked before packing, to ensure flawless appearance. After unpacking the unit, please inspect for any physical damage and retain the shipping carton and all relevant packing materials for use should the unit need returning. -
Page 7: Mains Power
Fig. 2.2 Mains Voltage Switch and Fuse MAINS SUPPLY 50/60Hz 40 WATTS MAINS POWER T250mA 230V FOR CONTINUED PROTECTION AGAINST FIRE T315mA 115V REPLACE ONLY WITH THE SAME TYPE OF FUSE SELECT VOLTAGE DESIGNED & MANUFACTURED BY BSS AUDIO Ltd. ENGLAND... -
Page 8: Voltage Setting
DPR-901ii Voltage Setting Safety Earthing AC Power Fusing 2.4 Voltage Setting The mains voltage selector switch provides a simple external adjustment to allow operation on all international AC power standards. The allow- able ranges for the supply voltage are: 96VAC up to 132VAC on the 115V position and 195VAC up to 264VAC on the 230V position. -
Page 9: Audio Connections
Audio Connections 2.7 Audio The DPR-901ii audio inputs are RFI filtered and electronically balanced, with the outputs electronically balanced and floating. They are designed Connections to operate at any signal level up to +20dBu and will drive into loads of 600 ohms or greater. -
Page 10: Ground Loop Control
DPR-901ii Ground Loop Control Strict adherence to the wiring conventions noted above within a fully 2.8 Ground Loop balanced signal system will yield the best possible results with none of Control the problems normally associated with interconnected audio equipment. Wherever possible, cable screens should not be connected to any signal pin, but rather left to perform a cable shielding function only. -
Page 11: Controls
Controls Controls When depressed, the processing is engaged and the LED (underneath) 1 EQ IN lights in confirmation. When released, processing is disabled; the LED is off and the incoming signal passes to the output unchanged and at unity gain (0dB). Note: As the DPR-901ii’s entire signal path is bypassed in this mode, signal will be passed to the output even if the AC power is discon- nected - or fails. - Page 12 DPR-901ii Controls When depressed, the band is operative. The LED underneath lights. 5 IN When released, the band is bypassed. This is useful for dropping out effects when they’re not needed (without disturbing the other settings), and for A/B comparisons. Turn to set the centre frequency of the dynamic activity.
- Page 13 Controls 9 FILTER/DEFEAT (Band two and band three only). Switches the EQ from a bell response to a flat (wide-band) response. With the bell response, the process sensitiv- ity is reduced symmetrically either side of the selected centre frequency. When the Defeat setting is selected by depressing the button, the af- fected band becomes EQ-less, like a conventional compressor/expander: it responds to all frequencies equally.
- Page 14 DPR-901ii Controls These horizontal LED displays give an instant, intuitive check on 11 Compression/ whether the process in each band is active, by how much, and whether Expansion Display it’s expansion or compression. The amount of expansion or compression is indicated by an easy-to-memorise 1-8 scale, with ‘8’ indicating maxi- mum (hard) compress or expand.
- Page 15 Controls 14 BELOW Threshold When the switch is released, the processing operates above threshold, that is with compression or expansion being applied only to signal levels that exceed the threshold. When the switch is depressed to select Below, the green led beneath the switch lights. The threshold’s sensitivity setting remains the same, but the processing is ‘turned on its head’...
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Page 16: Principle Of Operation
DPR-901ii Principle of Operation Principle of Operation The DPR-901ii is fundamentally different to ordinary de-essers, Dolby systems and the like because it uses subtractive techniques to control the degree of compression or expansion. This enables the VCA (gain control element) to be kept out of the direct signal path. As a result, the through- going signal is not subjected to the noise and distortion that’s intrinsic to even the best VCAs. - Page 17 Principle of Operation expand level control, whose function is similar to a ratio control on conventional dynamic processors. The DPR-901ii Dynamic Equaliser, with four separate sections of this processing, offers considerable processing performance by adding another variable dimension to con- ventional equalisation.
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Page 18: Using The Dpr-901Ii
DPR-901ii Using the DPR-901ii Using the DPR-901ii Refer to the block diagram in Fig 5.1opposite. We recommend you familiarise yourself with the normal above thresh- old mode of operation before exercising the below threshold configura- tion. The latter is more subtle in effect, and requires more precise adjust- ments of level, especially in expansion. - Page 19 Using the DPR-901ii 5.1 DPR-901ii Block Diagram...
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Page 20: Warranty Information
Warranty Information Warranty Information This unit is warranted by BSS Audio to the original end user purchaser against defects in workmanship and the materials used in its manufac- ture for a period of one year from the date of shipment to the end user. -
Page 21: Appendix A
Chassis/0V Link Removal Appendix A NOTE: A1 Chassis/0V Link Removal. Since both the audio inputs and outputs are wired fully balanced we would suggest that you fully recheck all audio wiring for correctness prior to proceeding. All DPR-901ii units are shipped with the signal 0v/ground connected to the metal chassis via a wire link, and an rf bypass capacitor on the main pcb. -
Page 22: A2 Input Pin 1 To Chassis Connection
DPR-901ii Input pin 1 to Chassis Connection Transient Suppressor Replacement A2 Input pin 1 to There are several options available on the connection between the input XLR pin 1, and the chassis, and the optimum configuration will depend Chassis Connection upon the installation, and the equipment it is connected to. -
Page 23: Technical Specifications
Specifications Appendix B Specifications Input Section 12kohm electronically balanced, +20dBu (+20dBv) maximum input level via a 3 pin male XLR cable plug. Common Mode rejection > -50dB, 20Hz to 20kHz. Electronically balanced and floating, capable of driving +20dBu (+20dBv) Output Section into 600ohms or greater via an XLR female cable plug. -
Page 24: Specifications
DPR-901ii Specifications Rear Panel Main input Main output Functions and Split input Facilities Split output Power AC 40VA, 50/60Hz, 115v/230V selectable externally. IEC mains input socket Size 482mm x 44mm x 292.1mm (19" x 1.75" [1U] x General 11.5" ) overall. Weight 5kg gross shipping. -
Page 25: Appendix C
Glossary Appendix C Glossary ACTIVE Active electronic circuits are those capable of voltage and power gain by using transistors and integrated circuits. Passive circuits are those which use only resistors, capacitors, transformers, etc. BALANCED Refers to a 3-wire connection in which two of the wires carry the signal, and the third acts as a shield, tied to chassis ground. - Page 26 DPR-901ii describe voltage levels, although strictly it only applies to 600 ohm circuits. We recommend you use dBu instead. dBu or dBv The addition of ‘u’ or ‘v’ after dB indicates an absolute scaling for the dB ratio. 0dBu (or 0dBv) = 778mV or 0.778 volts, and it has no regard to power or impedance.
- Page 27 LIMIT Limiting occurs when a compressor having a high ratio, generally 6:1 or more passes a signal that exceeds the equipment’s threshold setting. Large variations in peak signal level are ‘squashed’, typically fluctuating less than 3dB for a 20 to 30dB increase. See EXPAND’ (above)for an explanation of compression and thresholds.
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Page 28: User Notes
DPR-901ii User Notes... - Page 29 User Notes...
- Page 30 DPR-901ii...
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