Hardware Manual DSP-30 2.2 XLR Rack-mount, 2 Channel Digital Signal Processor *TD-000097-00* TD-000097-00 Rev.
WARNING! WHILE QSC HAS ENDEAVORED TO DEVELOP AND PRODUCE THE MOST DEPENDABLE AND ROBUST DIGITAL SIGNAL PROCESSOR (DSP) AUDIO PRODUCT FOR YOUR USE, DUE TO THE UNLIMITED AND POTENTIALLY DESTRUCTIVE (TO THE SOUND SYSTEM) CONFIGURATIONS THAT MAY BE APPLIED TO THE DSP BY THE USER, QSC CANNOT BE HELD RESPONSIBLE FOR DAMAGES RESULTING FROM ANY DEVIATION OR FAILURE BY THE USER TO STRICTLY FOLLOW THE RECOMMENDATIONS SET FORTH IN THE OWNER’S MANUAL FOR THE INTEGRATION OF THE DSP AND SIGNAL MANAGER SOFTWARE WITH YOUR
Table of Contents INTRODUCTION Product Overview..................................................................4 Front and Rear Panel Illustrations and Dimensions.................4 INSTALLATION Unpacking..................................................................................................6 What is Included...................................................................................6 Mounting............................................................................................
Introduction: Overview and Illustrations Overview The DSP-30 and Signal Manager software combine easy-touse, customizable, two-channel DSP with simple operatingmode selection that requires only two buttons to operate. It can be used with all amplifiers and is housed in a 1-RU , 19-inch rack-mount steel chassis. Sampling frequency is 48 kHz. with 24-bit resolution. Dynamic range is greater than 93dB.
Introduction: Illustrations and Dimensions Dimensions 5
Installation: Unpacking and Mounting Unpacking There are no special unpacking precautions. However, it is recommended you keep the original packing material for reuse in the rare event that service be required. If service is required and the original packing material is not available, ensure that the unit is adequately protected for shipment (strong box of appropriate size , sufficient packing material to prevent load-shifting or impact damage).
Installation: Balanced Audio Connections Connecting Audio Inputs and Outputs All audio connections should be balanced to ensure the best performance. Unbalanced signals may be used if necessary; follow the wiring guidelines below for recommended unbalanced termination. The audio input jacks are female 3-pin XLR /TRS “combo” connectors. They will accept male XLR plugs or TRS (tip-ring-sleeve) 1/4-inch phone plugs. The audio output jacks are male 3-pin XLR connectors.
Installation: Unbalanced Audio Connections Connecting Audio Inputs and Outputs All audio connections should be balanced to ensure the best performance. Unbalanced signals may be used if necessary; follow the wiring guidelines below for recommended unbalanced termination. The audio input jacks are female 3-pin XLR /TRS “combo” connectors. They will accept male XLR plugs or TRS (tip-ring-sleeve) 1/4-inch phone plugs. The audio output jacks are male 3-pin XLR connectors.
Installation: Connecting Audio Inputs and Outputs Audio Connections Once the input and output cables have been properly wired, they can be connected to the receptacles on the rear panel of the DSP-30. INPUTS- Input jacks are “combo” style. They accept either male XLR or 1/4-inch diameter TRS phone plugs. Plug line level audio source into the input jacks. Use balanced connections wherever Rear Panel Audio Connections possible. OUTPUTS- Output jacks are male XLR style. They accept female XLR plugs.
Installation: Connecting to the RS-232 Port Connecting to the RS-232 Port Connect to the RS-232 port using the 9-pin serial data cable (included in the shipping box). Orient the DB-9 plug correctly, insert the plug fully into the RS-232 port and finger-tighten the retaining screws. The cable length should be 25 feet or less. “Null-modem” type cables will NOT work.
Installation: System Requirements and Software Installation The DSP-30 relies on the Signal Manager software for its DSP signal chains or configurations. You must use the supplied software to design your configurations and then load those configurations into the DSP-30 using a simple RS-232 connection. The DSP-30, as shipped from the factory, is configured to pass audio signals from input to output unaffected for all 8 presets.
Use: Control, Indicator, and Connector Descriptions FRONT PANEL POWER switch- This rocker switch turns the unit on by pressing the top side of the switch. Turn off by pressing the bottom side of the switch. POWER indicator- This blue LED illuminates when the unit has power properly applied and the power switch is in the “On” position. CHANNELS- These green LED’s illuminate when the unit detects an input signal on each channel. Each channel’s indicator operates independently.
Use: Control, Indicator, and Connector Descriptions RS-232- This DB-9 female jack is for attaching the serial cable between the unit and the computer. Use this connection for loading your DSP configurations from the computer to the DSP and for “real-time” configuration tuning with Signal Manager software. PRESET SELECTIONS buttonsBROWSE- increments the Preset Memory and the Preset Number Display.
Use: General Use Guidelines and Preset Description IMPORTANT! Please read before operating this Digital Signal Processor with your audio system. General Use Guidelines This is a professional level DSP product that allows the user to produce virtually unlimited signal processor variations and configurations. Because of the infinite configuration possibilities of digital signal processing, it is possible to create configurations that may result in unwanted signals or uncontrollable output.
Use: Saving Presets Using QSC’s Signal Manager software Presets The DSP-30 must be loaded with your desired presets using the Signal Manager program before use. Test all new presets for expected behavior at low power levels to avoid inadvertently damaging speaker systems. The DSP-30 has eight Preset memories numbered 1 through 8. Presets are DSP configurations saved to memory in the DSP. Only one preset may be active at one time. The possible configurations of the presets are essentially limitless.
Use: How to Recall a Preset from the Front Panel TO RECALL A PRESET1- Press the BROWSE key until the desired preset number shows in the display. The selection display flashes until Step 2 (below) is completed. 2- Press the ACCEPT key to activate the selected preset in the DSP. Once the preset is active, the display will stop flashing. Note! The ACCEPT button must be pushed within 30 seconds of selecting the preset. If a longer time passes, the DSP-30 will revert to its original preset.
Use: LOCK OUT Feature TO LOCK THE FRONT PANEL BUTTONS (Browse and Accept pushbuttons)1- Press the Accept button and hold it down for at least three seconds. 2- The “lock” indicator will illuminate. 3- The Browse button is disabled. Press the Accept button and hold for three seconds to lock/unlock the preset selection. UNLOCKED LOCKED FRONT PANEL DISPLAYExample shows Preset 7 in “unlocked” and “locked” state.
Use: Contact Closure Feature Contact Closure Feature The contact closure feature is used to trigger gain changes All switched gain objects in a DSP configu- in the DSP. Any configuration that uses one or more ration will be triggered by the one contact switched gain objects (see Signal Manager software Help closure. It is not possible to trigger file ) can take advantage of this feature. The contact switched gain objects individually! closure will trigger all switched gain objects at once.
Use: RS-232 Pinout RS-232 Pinout: The diagram below shows the pin assignments for the female RS-232 connector on the DSP. Pin Signal Description 1 2 3 4 5 6 7 8 9 DCD TD RD DTR GND DSR RTS CTS Contact Closure *Note! Pin 9 is used for contact closure input. This pin is not normally used by RS232 devices.
Use: Application Example TRI-AMPED PA CABINETS WITH SUBWOOFER (refer to illustration at right) This is highly generalized, but shows the main idea in cre- limiting. DSP #3 (assigned to low frequency drivers) might ating larger systems. In this example, the audio source provide a 45 Hz to 1100 Hz bandpass with EQ to remove material is connected to the inputs of all four DSP’s. Take modal resonances of the listening environment.
Use: Application Example TRI-AMPED PA CABINETS WITH SUBWOOFER: Sample Application Diagram 21
Specifications Audio Converters 24 bit, 48 kHz. Frequency response 20 Hz–20 kHz ±0.4 dB at 1dB below full scale input voltage (all sensitivities) Distortion <0.007% THD+N @ 1dB below full scale output, all sensitivities, 20 Hz– 20 kHz Group Delay 1.00 milliseconds Dynamic range AES-17 -60dB method >95dB unweighted, 1.
Specifications Signal Processing Capabilities Compressor (RMS responding) 8 programmable presets Peak limiter (peak responding) RS-232 control Parametric equalization Signal splitter High and Low shelf Filter Signal polarity selection High and Low pass Filter (responses: Butterworth, Bessel, Linkwitz-Riley) Delay (910 millisecond max., all delay objects, 20.
Architect’s and Engineer’s Specification The Digital Signal Processor (DSP) shall provide two independent Compressor-- The DSP shall provide a signal compressor that is channels of DSP for signal delivery to all professional power assignable anywhere in the signal chain. It shall be based amplifiers. Input and output sensitivity shall be adjustable to upon the RMS signal level. The compressor shall be accommodate consumer and pro audio signal levels. capable of being bypassed.
Maintenance, Warranty & QSC Contact Information Cleaning Disclaimer The faceplate and chassis can be cleaned with a soft cloth and QSC Audio Products, Inc. is not liable for any damage to speakers, nonabrasive, mild cleaning solution. Products like Simple Green amplifiers, or any other equipment that is caused by negligence or and Windex work well. Do not use powders or scrubbing pads of any improper installation and/or use of this digital signal processor.
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