Electro-Voice DML-1122 User's Manual
Contents
1. 40 25 5 1 0 20 kHz median see Figure 8 19 3 12 8 7 3 1 0 20 kHz median see Figure 8 3 0 dB 1 3 dB 120 dB SPL see Figure 10 4 3 1 0 0 7 1 5 120 dB SPL see Figure 10 0 7 1 4 0 7 THE DELTAMAX SYSTEM SPEAKER SPECIFICATIONS Transducer Complement High Frequency Low Frequency Efficiency High Frequency Low Frequency Long Term Average Power Handling Capacity Per EIA Standard RS 426A High Frequency Low Frequency Short Term Power Handling Capacity 10 ms High Frequency Low Frequency Maximum Long Term Midband Acoustic Output High Frequency Low Frequency Nominal Impedance High Frequency Low Frequency Minimum Impedance High Frequency Low Frequency Dimensions Height Width Depth Net Weight Shipping Weight Enclosure Materials Structural Finish Grille Hanging DML 1122F and DML 1152F only faur DML 1122 DH1A variant compression driver 1 3 inch exit DL12X variant 12 inch woofer 25 4 5 75 watts 300 watts 300 watts 1 200 watts 18 8 watts 13 5 watts 8 ohms 8 ohms 6 0 ohms 8 4 ohms 58 4 cm 23 0 in 37 1 14 63 in 35 6 om 14 0 in 30 7 kg 68 Ib 33 9 kg 75 Ib 14 ply birch plywood Black textured paint Steel with charcoal gray foam 3 point flying system accepts Aeroquip 32326 and 32343 fittings Specifications DML 1152 DH1A compression driver 2 inch exi2. F Security A security cover and attachment screws are supplied to protect the control settings against uninvited adjustments O ns y P ws nm m _ sixteen
3. CHANNEL SHOWN FIGURE 14 DeltaMax Output Connection att THE DELTAMAX SYSTEM SENSE INPUTS HF LF Figure GAIN CONTROL BUS OUTPUT HF LF LF INPUT n PATCH di l SENSE OUTPUT HF OO OO POWER AMPLIFIER LEFT RIGHT LEFT DML COMPRESSION DRIVER RIGHT DML n COMPRESSION DRIVER i L lu OUTPUT LF POWER AMPLIFIER LEFT RIGHT LEFT DML WOOFER RIGHT DML U WOOFER mM CABLE LI INPUT LEFT RIGHT HF HF INPUT INPUT FIGURE 15 Interconnection for Two Channel Operation fourteen THE DELTAMAX SYSTEM Installation INSTALLATION continued DELTAMAX CONTROLLER INSTALLATION Operating Voltage Selection The DMC can be powered with line voltages other than 120 volts by altering the primary wiring of the power transformer CAUTION No user serviceable parts inside Hazardous voltage and currents may be encountered within the chassis To avoid electric shock do not perform any servicing unless you are qualified to do so The service information contained within this document is for use only by Electro Voice Inc authorized warranty stations and qualified service personnel To change the transformer primary wiring configuration use the following procedure 1 Disconnect the DMC from the ac power source 2 Remove the seven screws securing the top cover There are two screws on each side two screws on the
4. Raah I FIGURE 9 DML 1122 DMC 1122 Harmonic Distortion 115 dB SPL 1 meter using typical music frequency spectrum DIRECTIVITY INDEX Di dB Figures ATI A RAE z b Boll silk earn PAN ali CAN mun FREQUENCY Hz BEAMWIDTH IN DEGREES FIGURE 6 DML 1152 DMC 1152 Beamwidth vs Frequency Whole Space anechoic MO SPECIFIC Ra VALUES Ht DIRECTIVITY FACTOR Ra Q DIRECTIVITY INDEX Di dB FREQUENCY IN HERTZ FIGURE 8 DML 1152 DMC 1152 Directivity Factor and Directivity Index vs Frequency Whole Space anechoic TINN TIT unoamenrac LLLI TTT LT Co HE VH MN Mila LEE LE T TELE TE FETTE V BEL Se A se e LLIA Y AL UT LI d III AW EN SL T CMT LIL MIN 3rd HARMONIC s we 2o00 so 10000 2900 FREQUENCY IN HERTZ FIGURE 10 DML 1152 DMC 1152 Harmonic Distortion 120 dB SPL 1 meter using typical music frequency spectrum LEVEL IN dB Block Diagram THE DELTAMAX SYSTEM FUNCTIONAL BLOCK DIAGRAM SNOILO3NNOO 20914095 HOSS3tHdWOO H3Xv3dS i SINdNI 3SN3S SNB 1OHINOO NIVO Yals Id NV AON3nO3H4 CWILN3H344IO LEGER ten EV tHe DELTAMAX SYSTEM Operation OPERATION CALIBRATION To prevent amplifier clipping it is necessary to calibrate the DeltaMax Controller s internal amplifier limit
5. circuits to the actual clip level of the power amplifiers Before connecting ac power to the unit make sure that the unit is compatible with the available mains voltage Make Connections Connect the high and low frequency outputs of the DeltaMax controller to the designated high and low frequency inputs of the power amplifier See the Installation section for details The maximum power recommendation for the DMC 1122 is 600 watts per channel and for the DMC 1152 itis 800 watts per channel The suggested input cable configura tion is a balanced pair with a shield Connect the low frequency output of the power amplifier to the LF sense input of the DeltaMax Connect the high frequency output of the power amplifier to the HF sense input of the DeltaMax High quality dual banana plugs are recommended Shielded or unshielded cable may be used The inputs are high impedance floating differential Small gauge wire i e 22 gauge is acceptable but be sure the connections are secure and safe for the high voltages from the amplifier output See Figure 13 for a wiring diagram of a single DeltaMax Controller to a dual channel power amplifier BE SURE THE SPEAKERS ARE NOT CONNECTED TO THE AMPLIFIERS AT THIS TIME Front Panel Settings 1 Set the two output level controls to their center detent position The slots of the controls are aligned with the o mark when in the center detent position 2 Turn the amplifier calibr
6. present a nominal eight ohm load to the amplifer however the compression driver has a low frequency protection capacitor in series NOTE DML 1122 speakers may be paralleled with other DML 1122 speakers if the amplifier is capable of delivering adequate power at the lower impedance The same holds true for the DML 1152 speaker systems SPEAKER INSTALLATION Hanging The DML 1122F and DML 1152F are flying versions of the DML 1122 and DML 1152 CAUTION The DML 1122F and DML 1152F speaker systems should be suspended overhead only in accordance with the procedures and limitations specified in the DML 1122F DML 1152F Flying Manual which is packed with each flying speaker system Each cabinet has a total of six steel reinforced aircraft type pan fittings three on the top and three on the bottom This three point flying system makes maximum use of the trapezoidal cabinets permitting a wide range of angle adjustment and offering maximum flexibility in array design and implementa tion for both the touring sound company and the sound con tractor The pan fittings mate with the Aeroquip 32343 and 32326 stud fittings suala THE DELTAMAX SYSTEM Figure SENSE INPUTS HF DMC 1122 le DMC 1152 INPUT CABLE INPUTS QO oo AMPLIFIER HI LO CHANNEL CHANNEL CHANNEL CHANNEL TO DML COMPRESSION DRIVER TO DML WOOFER FIGURE 13 interconnections for Single Channel Operation DELTAMAX CONTROLLER OUTPUT ONE
7. E Eleciro Voice y THE DELTAMAX SYSTEM OWNER S MANUAL DMC 1122 DMC 1152 CONTROLLERS DML 1122 DML 1152 LOUDSPEAKERS THE DELTAMAX SYSTEM Table of Contents TABLE OF CONTENTS Page DESCRIPTION and FEATURES cinco vos SSE VAR ya RASS ances SPECIFICATIONS Gontroller DME rmm ITA EVIS KAN kas raa 3 DONSMAKSVEIOMI v 2 cue pu OKON es ES emia Pan Ee VON KOTAS 3 Dolta Max Eoudspeaker uQ ess js es sos stere sev uua enas 4 DML 1122 DMC 1122 Frequency Response 5 DML 1152 DMC 1152 Frequency Response 5 DMI 1 422 Polar osponse su e eso o VE antes EN ERR 5 6 DMI 1159 Poar Hesponee 7 8 DMI 1122 DMET52 Beamwldtft Se eru prr mnt SE pone 9 DME 1122 Directivity Factor index sere er metn mn tme 9 152 Directivity IBdOX ve eee reet ones sie e 9 DML 1122 1152 Harmonie Distortion se em es meme mre nns 9 FUNCTIONAL BEOCK DIAGRAM 25 ere ko minion nie KIS SS 10 OPERATION als su ura paras OF s Kn a e a daa earns 11 Eimit Indicalionig 2 5 sai sen SONS Sin ace Chee Garam 11 Amplifier Emil zs de vis tr rA IN E OA TKP 11 Exeuralon sus seson Us SLE UN kN Beet SA ASSI 11 Temperature iikuy occ v PERI e pE EE THING ER 12 INSTALLATION Amplifier Bedquiremieris urs nt ay apasaq cu pe e nca da eg 12 Connector and Cable 12 DeltaMax Speaker
8. Installation 12 Interconnections for Single Channel Operation 13 Delt Max Output Connections xis se ase u oe Heim laos aw ens 13 Interconnections for Two Channel Operation 14 DeltaMax Controller Installation rsss e ste mision samo niao tee 15 Operating Voltage Selecta uu sm ne unge aes 15 scm a tine T ek tu carer 16 Mic op TET ON T CET CTI 16 MONIIA ON sassa sue tajs wr excel c III SN 16 MAUNTENANGE ko eo okej nepero l sado 16 X RAY VIEW OF P C BOARDS Power Supply ies ESEO ON EX ENS He ISS 17 Man IBOBIO Ch peso scie ouest NNI EIN SX vB do ee 18 SCHEMATIC DIAGRAMS 1524 Im ems ats iae 19 28 SERVICE WARRANTY INFORMATION Shipping Damage sss sisi saa 858 alo klako alo ave Skemo gie 29 KMIOKIISGNVIOB c ero lL krm RE shoud Matias 29 Gontroller Power Inspection sesa us eis 4 su SIU lanan 29 Driver Replacement lon Y We tis Saa uo Siete 29 E OE a 29 WARNING TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE DeltaMax Loudspeaker DML DeltaMax Controller DMC The DML and DMC abbreviations are used quite frequently in the manual THE DELTAMAX SYSTEM Description DESCRIPTIO
9. N GENERAL The DeltaMax System consists of a 2 way biamped high performance speaker system and a companion electronic controller The DML 1122 and DML 1152 are full range loudspeaker systems intended for high level sound reinforce ment in touring sound and permanent installation applications The electronic protection technology incorporated into the DeltaMax System allows the loudspeakers to be operated at full capacity with maximum fidelity and reliability The trapezoidal cabinet shape allows tight cluster designs enabling maximum mutual coupling and single point source arrays The DML 1152 employs a 15 inch woofer for low frequency reproduction and a standard 2 inch exit DH1A compression driver The DML 1122 utilizes a 12 inch woofer and a 1 3 inch exit modified DH1A high frequency driver Both systems use flat front constant directivity high frequency horns which are based on the Electro Voice HP series Patent 4 685 532 and are geometrically optimized for performance from 1 250 Hz to 20 000 Hz The DeltaMax flying versions models DML 1122F and DML 1152F include three steel reinforced aircraft type pan fittings on the top and bottom of the enclosures to facilitate the hanging of multi cabinet arrays The DML 1122F DML 1152F Flying Manual is packed with each flying speaker system The electronic circuits are designed to provide optimum audio performance even when the audio drive level is increased for maximum loudne
10. Q WS Sa lt 1 Le MUN p 1 6 1 N A AS li SO 25 V 8 VI ano LOPE C Ne 3 2 ne X SN gt Z 2 V Lo lt ANE NS S KK LO 8 lli HORIZONTAL VERTICAL FIGURE 4 DML 1152 DMC 1152 Polar Response Vs octave pink noise 4 volts at 20 feet Figures EV THE DELTAMAX SYSTEM 22 KI SE A VN a Ri Cant fitim e Var SEPO KV E lt lt KRII 2 UNS Dee MIE P S S VERTICAL V3 octave pink noise 4 volts at 20 feet lt A 8 o c c ku a N To My 8 N z a e f u tc 2 6 Ev THE DELTAMAX SYSTEM BEAMWIDTH IN DEGREES 6 dB DIRECTIVITY FACTOR Rg Q FIGURE 7 DML 1122 DMC 1122 Directivity Er Noll Ghd oi hi k PT P AVAL aki FREQUENCY Hz FIGURE 5 DML 1122 DMC 1122 Beamwidth vs Frequency Whole Space anechoic LI mil Lib zm m eT L TIT TI TINTIN LL EH Factor and Directivity Index vs Frequency LEVEL IN dB Whole Space anechoic LUT Shape 1 renet A ic tru TRIS frequency spectrum NIU FILIA er eem T ELE ane Harmonie i NIN Ra E
11. at the maximum temperature will not be exceeded INSTALLATION AMPLIFIER REQUIREMENTS The DML 1122 and DML 1152 speaker systems require professional power amplifiers with the following ratings DML 1122 LF 300 600 watts continuous into eight onms HF 125 250 watts continuous into eight ohms DML 1152 LF 400 800 watts continuous into eight ohms HF 125 250 watts continuous into eight ohms The power amplifiers should have a voltage gain between 27 and 35 dB 32 dB is optimum The use of amplifiers with lower power ratings is acceptable however the full power capabilities of the DML speakers will not be realized The use of amplifiers with significantly higher power ratings is wasteful and may endanger the loudspeakers it is generally not recommended Under certain circumstances higher rated power amplifiers are acceptable It is acceptable to drive either the DML 1122 or DML 1152 speakers with a stereo power amp utilizing one chan nel to drive the low frequencies and the other channel to drive the high frequencies In this configuration the user should set the Amplifier Calibration level to the 125 250 watt range to limit excessively high power levels from reaching the compres sion driver The user is instructed to consult the Operation section of this manual for details of this procedure CONNECTOR AND CABLE REQUIREMENTS Controller The DeltaMax has XLR type connectors for signal input and output Pin 1 is ground re
12. ation control to full counter clockwise 3 Press the cal switch to its recessed position with a screw driver or other suitable tool 4 Set both amplifier gain controls for 32 dB gain or full clockwise 5 Connect an input signal with a 500 Hz test tone Music program may be used if necessary 6 Turn the LF output level control clockwise with a screw driver until the low frequency channel of the power amplifier begins to clip Clipping is noted by the clip indicator on the power amp or monitored with an oscilloscope 7 Turn the LF amplifier calibration control clockwise with a screwdriver until the LF amplifier limit light of the DeltaMax just comes on or to a lower predetermined power level A lower power level setting is desirable when the power rating of the amplifier is much greater than 250 watts It should light at or just before amplifier clipping 8 If using a test tone adjust the oscillator for a test signal of 5 kHz 9 Turn the HF output level control clockwise with a screw driver until the high frequency channel of the power amplifier begins to clip 10 Turn the HF amplifier calibration control clockwise with a screwdriver until the HF amplifier limit light of the DeltaMax just comes on Again the amplifier limit indicator should light at or just before amplifier clipping 11 Return the LF and HF output level controls to their center detent position and reset the cal switch to the Limit position o
13. d Spectrum Second Harmonic 100 Hz 800 Hz 2 000 Hz 5 000 Hz Distortion Indicated SPL at 1 Meter Shaped Spectrum Third Harmonic 100 Hz 800 Hz 2 000 Hz 5 006 Hz SENSE CHANNEL INPUTS Maximum Level LF 145 V RMS HF 145 V RMS Impedance 100 kilohms each side to ground Connector Two binding posts OUTPUTS LF and HF Type Transformer floating differential Maximum Level 18 dBu Minimum Load Impedance for Full Level 600 ohms Connectors Male 3 pin XLR type POWER REQUIREMENTS 100 120 220 240 V ac 50 60 Hz 13 W CHASSIS CONSTRUCTION Painted steel COLORS Gray front panel black chassis with white graphics MOUNTING EIA 19 rack mount 1 75 high 8 25 behind panel exciuding connectors Supplied with front pane security cover for controls DML 1122 DMC 1122 70 Hz 20 kHz see Figure 1 98 dB 123 dB 129 dB 1 250 Hz 1 0 20 kHz horizontal see Figure 5 809 259 20 3 8 20 kHz vertical see Figure 5 559 1259 59 1 0 20 kHz median see Figure 7 10 6 9 3 4 0 1 0 20 kHz median see Figure 7 3 2 dB 1 6 dB 115 dB SPL see Figure 9 4 5 0 8 0 7 1 6 115 dB SPL see Figure 9 0 9 1 8 0 9 1 6 DML 1152 DMC 1152 50 Hz 20 kHz see Figure 2 100 dB 126 dB 132 dB 1 250 Hz 1 2 20 kHz horizontal see Figure 6 60 25 5 1 2 20 kHz vertical see Figure 6
14. ession driver employ the best available technology for high power and accurate sound reproduction A state of the art flat front constant directivity horn is utilized for even coverage and flat response THE DELTAMAX SYSTEM Specifications CONTROLLER SPECIFICATIONS CHANNEL CONFIGURATIONS Monaural two way two sense channels FILTER TYPE 4th order Linkwitz Riley CROSSOVER FREQUENCY 1250 Hz GAIN 6 dB nominal equalized outputs TOTAL HARMONIC DISTORTION 20 20 000 Hz 0 03 typical 0 1 maximum NOISE EACH OUTPUT 20 20 000 Hz NBW TYPICAL 86 SIGNAL INPUT Maximum Level 18 dBu Impedance 20 000 ohms CMRR Typical 55 dB Connector Female 3 pin XLR type SYSTEM SPECIFICATIONS Frequency Response Measured In Farfield Calculated to One Meter on Axis Swept One Third Octave Pink Noise 2 83 V at 500 Hz Anecholc Environment 3 dB Sound Pressure Level at One Meter One Watt Input Power Anechoic Environment Band Limited Pink Noise Signal 400 1 200 Hz Typical Maximum Continuous Sound Pressure Levels at One Meter Anechoic Environment Typical Maximum Peak Sound Pressure Levels at One Meter Environment Crossover Frequency Dispersion Angle Included by 6 dB Down Points on Polar Responses Indicated One Third Octave Bands of Pink Noise Directivity Factor R Q Directivity Index Dj Distortion Indicated SPL at 1 Meter Shape
15. ference pin 2 is high and pin 3 is low The LF and HF sense connections are five way binding posts Figure 14 illustrates the preferred interconnect ing between the DMC and the power amplifier Two typical system configurations are illustrated in Figures 13 and 15 The gain control bus is accessed through a two conductor inch jack This feature is used when it is desired for the gain of two or more units to track Using a standard inch patch cable connect the jacks together For more than two units use Y connectors Speaker The DML 1122 and DML 1152 are equipped with ITT Cannon EP 4 connectors for electrical connection to the woofer and compression driver Each cabinet has two connectors one male EP 4 14 for input signal and one female EP 4 13 for paralle wiring for connecting additional DML loudspeakers The mating connectors for the cable ends are the EP 4 11 IC for the input connection and the EP 4 12 IC for the parallel connection Cables connectors and wiring accessories for the DML speakers are manufactured by Pro Co Sound Inc and Whirlwind Music Distributors Inc To find your local Pro Co or Whirlwind dealer contact Pro Co Sound Inc 135 E Kalamazoo Ave Kalamazoo MI 49007 Whirlwind Music Distributors Inc P O Box 1075 Rochester NY 14603 The pin connections are as follows Pin 1 LF Pin 2 LF Pin 3 HF Pin 4 HF Both the low frequency and high frequency inputs
16. ould be adjusted so that this indicator lights when the amplifier clips It then acts as an amplifier clip indicator With the switch in the Limit position the indicator shows the onset of DeltaMax limiting due to maximum amplifier power If this indicator lights frequently when properly calibrated then it may be desirable to use a larger power amplifier or turn down the system level See the section on Amplifier Requirements Excursion Limit This indicator lights when output voltage clamping is occurring due to the detection of high diaphragm excursion Excessive diaphragm excursion may occur in the lower frequency ranges of operation of the drivers during high level operation Selective THE DELTAMAX SYSTEM Operation Installation OPERATION continued equalization may be used to reduce the level of the frequency range that is causing the excessive excursion allowing higher overall levels to be achieved For example program material with heavy low frequency content played at high levels may activate the woofer protection circuitry limiting the overall sound pressure level attainable Reducing the levels of the frequency bands below 100 Hz with an equalizer might eliminate the excursion problems allowing the overall level to be turned up higher Temperature Limit This indicator lights when the temperature of the speaker voice coil approaches its maximum level Under this condition gain reduction will occur so th
17. rear and one screw in the front panel center top 3 Locate the voltage selection terminal strip mounted on the bottom of the chassis near the power transformer The transformer has six primary leads five of which are soldered to the terminal strip in the following order Position Wire Color 1 Black 2 Violet 3 Blue 4 Violet Blue 5 Blue White The sixth lead which is black white and two black leads from the fuse holder are attached to the terminal strip with solderless connectors Primary operating voltage selection is accomplished by moving these three wires to the appropriate location See Table for the correct wire loca tion for the selected mains voltage 100 V ac TABLE Primary Power Conversion Chart for 100 120 220 and 240 V 50 60 Hz Operation 120 V ac 4 Install the correct line fuse See values in Table Il 5 Plug the DMC into a variac and sweep the mains voltage from zero to full operating voltage while monitoring the voltage on the primary filter capacitors The measured voltage should be 29 volts See the PCB x ray view Figure 17 If the measured voltage is not within 10 of this value turn the unit off and verify the connections in step 3 6 Reinstall the top cover with the seven screws Line Fuse MDL Series Slo Blo 0 25 A 250 V 0 25 A 250 V 0 10 A 250 V Line Voltage 0 10 A 250 V TABLE li Main Fuse Selection Guide 240 V ac Ev rue DELTAMAX SYSTEM In
18. ss A high performance compressor is con trolled by special speaker modeling circuits to provide speaker excursion protection speaker temperature protection and amplifier anti clip limiting Optimum performance of these speakers can only be assured when used with their dedicated electronics Do not use with other electronic crossovers and or processors FEATURE SUMMARY Fourth order Linkwitz Riley crossover filters provide smooth accurate response through the crossover region Special equalization circuits allow flat wideband system response Sensing circuits for each driver control the compressor to prevent voice coil overheating and amplifier clipping Voltage clamp excursion protection does not alter program dynamios Multi time constant compressor circuit with variable compres sion ratio reduces peak and average levels as necessary while preserving relative program dynamics A connection to the control voltage is available through a jack on the back panel This allows precise gain tracking when more than one unit is used The front panel display shows drive signal level and com pressor gain reduction Sensing display for each sense channel shows amplifier limit excursion limit and temperature limit When its limit is approached each LED lights yellow i Speaker system is trapezoidal for compact arrays Flying versions feature integral steel reinforced fittings to facilitate hanging Both the woofer and the compr
19. stallation Maintenance INSTALLATION continued MAINTENANCE Mounting Use a soft damp cloth to clean the unit when it becomes dirty No other maintenance is required The unit is one rack space high 134 and fits a standard EIA 19 inch rack Mount the DMC in a rack cabinet near the power amplifier s to make wiring easy Grounding A widely accepted grounding technique for audio systems is the single point ground The final configuration will be deter mined by the size of the system and the equipment used in the system However the single point grounding system is recommended as a starting point The interconnecting cables of line level equipment such as the DeltaMax Controller should have the shields connected at one point only usually the receiving end of the signal transmis sion See Figure 14 Never lift the third wire safety ground of the ac power cable It protects against possible shock hazard When deciding how to best ground the DMC in a particular system note that the DMC s input and output XLR type connectors have pin 1 referenced to ground Circuit ground is tied to the chassis ground internally at one point The input to the DMC is active differential and the output is transformer isolated Ventiliation Adequate ventilation should be provided in the rack to main tain a reasonable operating temperature Under any conditions the ambient temperature inside the rack cabinet should not exceed 60 C or 140
20. t DL15X 15 inch woofer 25 5 0 75 watts 400 watts 300 watts 1 600 watts 18 8 watts 20 0 watts 8 ohms 8 ohms 6 5 ohms 7 9 ohms 75 9 cm 29 88 in 45 2 cm 17 78 in 41 4 cm 16 28 in 43 3 kg 96 Ib 47 4 kg 105 16 14 ply birch plywood Black textured paint Steel with charcoal gray foam 3 point flying system accepts Aeroquip 32326 and 32343 fittings THE DELTAMAX SYSTEM Figures COO II root TTT LE LTETIE TIME mma mda Sel LUMU LE TITT ITI TII IHH TE TEILE IIU LUE IIU LT LOL I TE TITEL TE Ti 2 s wo SPLindB _ FIGURE 1 DML 1122 DMC 1122 Axial Frequency FIGURE 2 DML 1152 DMC 1152 Axial Frequency Response 1 watt 1 meter into LF midband Response 1 watt 1 meter into LF midband FIGURE 3 DML 1122 DMC 1122 Polar Response HORIZONTAL octave pink noise 4 volts at 20 feet VERTICAL five Figures THE DELTAMAX SYSTEM Ex UEU MEN A E SEO i Aas lt 3 MENO k lt NS ANN E REZ SEBO VORTO v4 cl SS i Eom A X lt S Q SA m N NS SS OHH MUSO e VERTICAL FIGURE 3 continued DML 1122 DMC 1122 Polar Response HORIZONTAL Vs octave pink noise 4 volts at 20 feet six Figures THE DELTAMAX SYSTEM I y 4 H 7 g TA lt EPO E lt
21. ut NOTE Ifthe power amplifier has an internal limiter or if clip protection is not desired the user has the option to leave the Limit switch in the recessed Cal Clip position When left in the Cal Clip posi tion the Amplifier Output Limit lights on the front panel of the DeltaMax will indicate when the amplifier is self limiting or clipping After the calibration sequence has been completed connect the speaker cables to the output of the amplifier Make certain that the lows are wired to the woofer and that the highs are wired to the compression driver In addition be sure to observe polarity when making speaker connections DISPLAY CIRCUITS The display circuits indicate to the user what is actually happening in the DeltaMax Controller and the DeltaMax Loudspeaker Input Level These three indicators show the drive level at the input of the DeltaMax Controller They are calibrated in dBu 20 0 and 16 Gain Reduction These three indicators show how much attenuation is being imposed on the signal by the compressor They are calibrated in relative dB 3 6 and 12 and provide a good indication of how much compression is occurring NOTE Do not allow the 12 dB indicator to stay on continuously If this happens then reduce the input signal drive level Output Limits for each output Amplifier Limit With the switch in Cal Clip position the Amplifier Calibration control sh
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