Electro-Voice DMC-2181A User's Manual
Contents
1. USED WITH DML 2181A SERIES SPEAKERS ONLY SYSTEM SPECIFICATIONS Frequency Response DMC 2181A with DML 2181A series Speaker One Watt into Sub Midband 2 00 Volts at 70 Hz on Axis in Anechoic Environment see Figure 1 36 100 Hz CONTROLLER SPECIFICATIONS General Functions Two way crossover subwoofer output includes frequency and time delay equalization 12 dB per octave infrasonic filter temperature excursion and amplifier clipping protection Channel Configuration Single channel monaural two way one sense channel subwoofer high frequency output unity gain above crossover frequency Crossover Frequency 100 Hz Crossover Filter 4th order Linkwitz Riley 24 dB per octave Gain 5 dB nominal equalized sub output Unity gain high output Signal Path Equalization subwoofer section 3 dB at 37 Hz 3 dB at 30 5 Hz Signal Delay subwoofer output 4 0 ms at crossover frequency Total Harmonic Distortion 20 20 000 Hz 0 03 typical 0 1 maximum Noise Each Output 20 20 000 Hz Band width Typical 86 dBu 1 See OML 2181A series enginesring data sheets for detailed speaker system specifications 2 0 dBu is 0 775 volts rms sine wave Signal Input Type Active differential Maximum Level 18 dBu Impedance 20 000 ohms and 0015 pf Common Mode Range 24 V CMRR Typical 55 dB Connector Female 3 pin XLR type Signal Outputs Type Transformer floating differential Maximum Le2. in order to facilitate adjustment of the crossover levels and provide easy visual inspection of the LED metering In this application signal return lines are needed to feed signal splits to the amplifiers The low source impedance will adequately drive long cable lengths A speaker sense line must be returned to each DMC 2181A controller from the amplifier location Grounding A widely accepted grounding scheme for audio systems is the star connection single point ground technique While the final configuration will be determined by the size of the system and the equipment used the star connection grounding scheme recom mended as a start Never lift the safety ground of the ac power cable as It protects against chassis shock hazard Ventilation In normal operation the controller generates some heat order to keep all components their operating range it is recommended that the electronics be mounted with adequate flow through ventilation front and back Do not place amplifiers or controllers in a sealed enclosure Leaving a single empty rack space between adjacent amplifiers and the controller preferably vented will provide a margin of safety for all devices Ambient temperature inside the enclosure should never exceed 60 degrees Centigrade 140 Security A security cover and mounting screws are supplied for protecting the user adjustable controls on the front panel of the controller CONN
3. 1 year from the date of original purchase Additional details are included in the Uniform Limited Warranty statement Service and repair address for this product Electro Voice Inc 600 Cecil Street Buchanan MI 49107 Specifications subject to change without notice ELECTRO VOICE INC 600 Cecil Street Buchanan Michigan 49107 MANUFACTURING PLANTS AT E BUCHANAN I NEWPORT TN 8 SEVIERVILLE TN OKLAHOMA CITY OK GANANOQUE ONT Elactro Voice inc 1992 E Litho in U S A Part Number 531934 221
4. a level capability of 18 dBu and a female XLR type connector The outputs shall be transformer isolated with a level capability of 18 dBu into 600 ohms and male 3 pin connectors There shall be two active differential sense inputs for speaker protec tion with binding post banana jack connec tors Front panel controls shall include sub and high level controls a sub amplifier calibration control and a switch to control the amplifier limit function all accessible with a screwdriver after removing the security cover There shall be a power switch on the front panel Front panel indicators shall include input level gain reduction output limits for amplifier excursion and temperature and power on The chassis shall be made of painted stee with a gray front panel and white graphics It shall be rack mountable a 19 inch EIA rack and be 4 45 cm 1 75 in high and 20 9 cm 8 25 in deep excluding connectors The unit shall weigh 3 6 kg 8 lb The unit shall an Electro Voice 2181 ELECTRO VOICE UNIFORM LIMITED WARRANTY STATEMENT Electro Voice products guaranteed against malfunction due to defects in materials or workmanship for a specified period as noted in the individual product line statement s below or in the individual product data sheet or owner s manual beginning with the date of original purchase If such malfunction occurs during the specified period the product will be repaired
5. 181A SERIES PRINCIPAL OF OPERATION Refer to block diagram in Figure 3 The signal path consists of an active differential input circuit which drives a fourth order Linkwitz Riley crossover section providing both high and low frequency adjustable outputs The high frequency split passes unaffected to its respective output The low frequency signal drives a VCA voltage controlled amplifier section which derives its control signal from a single amplifier linked sensing input after passing through a dual time constant compressor control circuit Following the VCA the low frequency signal enters a delay circuit for proper time phase alignment relative to other DeltaMax systems at crossover frequency and a frequency contouring equalizer to provide optimum flat response for the speaker system Additionally an underdamped second order high pass filter combined with a variation of a first order shelving low boost function provides optimum low frequency system rolloff Both outputs are transformer isolated with feedback for distortion reduc tion The primary dynamic action gain reduction of the compressor circuit is controlled by a dual time constant detection circuit driven by rectified audio sensed at the speaker terminals The compression ratio above the threshold is determined by modeling circuits which increases the compression ratio as required by detection of temperature and or amplifier clipping limits being passed
6. ECTIONS The DeltaMax controller has XLR type connectors for signal input and outputs Pin 1 is shield pin 2 is high and pin 3 is low The input is active differential and the outputs are transformer balanced differential When used in an unbalanced configuration pin 3 should be shorted to ground The SUB sense connection is a dual binding post banana jack five way binding post The sense input is active differential enabling connection to the output of mono bridged amplifiers and are high impedance allowing small gauge wire e g 22 AWG to be used for the sense connection Although current flow in the sense lines is negligible they must be capable of handling the high output voltages of the amplifiers AMPLIFIER REQUIREMENTS The DML 2181A cabinet contains two drivers With 4 pin Neutrik Speakon NL4MP R connector each driver may be accessed separately There are two ways these drivers may be wired 1 Each driver may be connected to its own separate amplifier channel Each amplifier channel should have a power rating of 400 600 watts into eight ohms The amplifier channels must be identical having the same voltage gain and power rating 2 The two drivers may be paralleled to one amplifier channel The speakers should be paralleled at the amplifier not at the cabinet The amplifier channel should a power rating of 800 1200 watts into four ohms NOTE DML 2181A cabinets may be paralleled in ei
7. In all modes the compressor gain transfer function has a gradually changing slope across its threshold This soft knee design reduces the audibility of the compression The ratio above the threshold can vary from 1 1 no effect to approximately 20 1 hard limiting depending on the signal source and the type of protec tion called for A dynamic frequency sensitive voltage limiter at the output of the low frequency band pro tects the speakers from excursion damage If the speakers approach their excursion limit the peak of the output waveform is clamped at a level above which excursion damage would occur FREQUENCY RESPONSE The frequency response of the DMC 2181A DML 2181A series combination shown Figure 1 was measured on axis in the far field of an anechoic environment using swept one third octave input and calculated to a one meter equivalent distance using the inverse square law Drive level was set at one watt of power 2 volts rms at 70 Hz delivered to the midband of the low frequency range INSTALLATION Mounting Location The unit is one rack space high 4 4 cm 1 75 in and fits a standard EIA 19 inch rack Mount the DMC controller in a rack cabinet near the power amplifiers to simplify wiring The controller is well shielded from magnetic and radio frequency interference It is possible to use the controller at a house mix location removed from the amplifier mounting location and near the mixing board
8. ckage size Additionally acoustic loading is improved yielding increased low frequency efficiency and reduced distortion over direct radiating and horn loaded cabinets The electronic circuitry in the DMC 2181A is designed to provide optimum audio perfor mance even when the audio drive level is increased beyond normally safe levels for maximum loudness A high quality low noise VCA is driven by speaker performance modeling circuitry to provide long term temperature protection and amplifier anticlip limiting Excursion protection is accomplished via voltage limiting circuitry which follows excursion frequency modeling parameters to control amplitude peaks before damage is incurred Front panel indicator lights show input level gain reduction and low frequency output limit thresholds for excursion temperature and amplifier clipping Operation of the protection functions is completely automatic The user adjustable clipping threshold calibration will work with any professional amplifier operating within the power and gain range stated in the Amplifier Requirements section IMPORTANT CAUTION Optimum performance and maximum protec tion of the DML 2181A series speaker systems can only be attained in conjunction with the DMC 2181A electronic controller DO NOT DRIVE THESE SPEAKERS WITH OTHER ELECTRONIC CROSSOVERS OR PROCESSORS DO NOT USE THE DMC 2181A CONTROLLER ON OTHER SPEAK ERS AS ALL PARAMETERS ARE SPECIFIC TO THE DML 2
9. ms intended for high level sound reinforcement and permanent installation applications The 2181 controller is intended to be used only with the DML 2181 A series low frequency speaker systems In addition to providing frequency SPL dB LT ET TP L ee 20 2 10000 20000 FREQUENCY HERTZ FIGURE 1 DML 2181A Series DMC 2181A Axial Frequency Response 1 watt 1 meter into LF midband RESPONSE IN dB PVN TT TAN LLELE E E PRH E H 200 1000 2000 10220 20000 FREQUENCY IN HERTZ FIGURE 2 DMC Frequency Response Crossover EQ Transfer Function etc 444 17 5 209 mm 8 25 in 483 mm 19 0 7 7 4 5 a 2 P s 44 FIGURE 3 Chassis Mechanical Drawing division time offset correction broad band equalization and high pass filtering the controller when placed in the signal path before the amplifier incorporates special speaker performance modeling circuitry to electronically protect the transducers against overexcursion voice coil overheating and amplifier clipping The result is maximum fidelity at extreme power outputs without sacrificing reliability The companion DML 2181A series speaker enclosures utilize two DL18MT low frequency reproducers and incorporate Electro Voice s Manifold Technology enclosure design This allows greater output over conventional vented boxes in a greatly reduced pa
10. or replaced at our option without charge The product will be returned to the customer prepaid Exclusions and Limitations The limited warranty does not apply to a exterior finish or appearance b certain specific items described in the individual product line statement s below or in the individual product data sheet or owner s manual c malfunction resulting from use or operation of the product other than as specified in the product data sheet owner s manual d malfunction resulting from misuse or abuse of the product or e malfunction occurring at any time after repairs have been made to the product by anyone other than Electro Voice or any of its authorized service representatives Obtaining Warranty Service To obtain warranty service a customer must deliver the product prepaid to Electro Voice or any of its authorized service representatives together with proof of purchase of the product in the form of a bill of sale or receipted invoice A list of authorized service representatives is available from Electro Voice at 600 Cecil Street Buchanan 49107 616 695 6831 and or Electro Voice West at 8234 Doe Avenue Visalia CA 93291 209 651 7777 Incidential and Consequential Damages Excluded Product repair or replacement and return to the customer are only remedies provided to the customer Electro Voice shall not be liable for any incidental or consequential MARK IV company damages Including withou
11. t limitation injury to persons or property or loss of use Some states do not allow the exclusion or limitation of incidental or consequential damages so the above limitation or exclusion may not apply to you Other Rights This warranty gives you specific legal rights and you may also have other rights which vary from state to state Electro Voice Electronics are guaranteed against malfunction due to defects in materials or workmanship for a period of three 3 years from the date of original purchase Additional details are included in the Uniform Limited Warranty statement Electro Voice Speakers and Speaker Systems are guaranteed against malfunction due to defects in materials and workmanship for a period of five 5 years from the date of original purchase The Limited Warranty does not apply to burned voice coils or malfunc tions such as cone and or coil damage resulting from an enclosure design inappropri ate for the program material Electro Voice flying hardware including enclosure mounted hardware and rigging accessories is guaranteed for one 1 year from the date of original purchase Electro Voice active electronics associated with the speaker systems are guaranteed for three 3 years from the date of original purchase Additional details are included in the Uniform Limited Warranty statement Electro Voice Accessories are guaranteed against malfunction due to defects in materials or workmanship for a period of one
12. ther of the above configura tions with other DML 2181A s if the amplifier is capable of delivering adequate power at the lower impedance The use of amplifiers with lower power ratings is acceptable however the DML 2181A will not realize its full power capabilities The use of amplifiers with significantly higher power ratings is wasteful and may endanger the loudspeakers it is not recommended The user is instructed to consult the DeltaMax Owner s Manual for details The manual is included with the DMC 2181A electronic controller ARCHITECTS AND ENGINEERS SPECIFICATIONS The controller shall consist of a crossover circuit with fourth order Linkwitz Riley filters a compression system with variable ratio and dual time constant detector a voltage clamping circuit for excursion protection speaker modeling circuits which control the compressor and clamp circuits to prevent destruction of the drivers due to excessive drive level Included in the signal path shall be special frequency equalization and signal delay to provide flat 3 dB on axis anechoic frequency response in the range of 36 Hz to 100 Hz The total harmonic distortion through the signal path shall be nominally 0 03 and no greater than 0 1 from 20 Hz to 20 kHz within the unit s passband The noise at the outputs measured with a 20 20 000 Hz equivalent noise bandwidih filter shall be typically 86 dBu The signal input shall be active differential with
13. vel 18 dBu Minimum Load Impedance for Full Level 600 ohms Protection Safe for short circuit or 25 volts de Connectors Male 3 pin XLR type Sense Inputs subwoofer only Type Active differential Maximum Level 145 volts rms Impedance 200 000 ohms differential Input Polarity Floating either side hot Connector Binding post banana jacks spaced 1 9 cm 0 75 in Electro Voice a MARK IV company DMC 2181A DeltaMax Electronic Controller for DML 2181A Series Low Frequency Sound Reinforcement Speaker Systems Controls all except power switch are screwdriver adjustable Output levels amplifier limit calibration amplifier clip limit switch power on off switch Indicators Three LED input level 20 0 and 16 dBu Three LED gain reduction 3 6 and 12 dB Three LED LF output protection temperature excursion clipping One LED power on Power Requirements 100 120 or 240 volts ac 50 60 Hz 13 watts Chassis Construction Painted steel Color Gray front panel and black chassis with white graphics Mounting and Dimensions EIA 19 inch rack mount 4 45 cm 1 75 in high 20 9 cm 8 25 in behind panel excluding connectors see Figure 3 supplied with front panel security cover for controls Net Weight 3 6 kg 8 Ib Shipping Weight 4 2 kg 9 lb 3 DESCRIPTION The Electro Voice DMC 2181A controller is part of the DeltaMax series of electronically controlled speaker syste
Download Pdf Manuals
Related Search