Models 4650 and 4660
Contents
1. Instruments Div C Van R Inc 5 January 2005 This contact update page has been added to the Acrobat document you have downloaded Please disregard any contact information printed within the document Our Mailing and Shipping Address White Instruments Div C Van R Inc 1514 Ed Bluestein Blvd Suite 201 for U S Mail Austin TX 78721 U S A Phone 512 389 5358 Fax 512 301 3932 Main Email Address cvanr whiteinstruments com World Wide Web Site http www whiteinstruments com Note Repairs and packages should be shipped to Suite 202 V3 v lt Models 4650 and 4660 One Third Octave Active Equalizers 1 St rume nts featuring Slide Controls This document was generated from the original printed 4650 and 4660 Data Sheets Brochures and Users Manuals CONTENTS cc 1 Models 4650 and 4660 One Third Octave RC Active Equalizers 3 Photograph Model 4650 eoe terae teu ed tu an pe edi dius 3 Photograph Model4600 i pde qu Ud 3 Models 4650 and 4660 Specifications Edo Uto uade 6 Models 4650 and 4660 Users Manual 8 TN PRODUC THON a ket dee ect eee eee 8 WHAT Y OU RAUB FOR Riot td 8 JUMP START eee amp WARRANTY POLICY 4 55 onte DU EOM 102. AS 28 ONE THIRD OCTAVE FILTERS BI COLOR LED EO IN OUT SWITCH LED COLOR TRANSITION CONTROL OUTPUT GAIN CONTROL LED and LED COLOR TRANSITION CONTROL The Bi Color LED can indicate several conditions Power Signal Present Headroom and Clipping Its color transition from GREEN to RED depends upon the highest signal level at either the input or output of the equalizer and the setting of the LED Color Transition Control The transition circuit is peak detecting and nearly instantaneous 18 POWER Power is indicated by either a GREEN or RED light SIGNAL Signal Present is indicated by a RED light The signal must have a level above 20 dBu in order to be detected In order to detect a signal with a level of 20 dBu the LED Color Transition Control must be in the full counter clockwise CCW position As the control is turned clockwise CW the threshold at which the LED will change from GREEN to RED is raised above the 20 dBu minimum setting dBu 20 log V 775 dBm with 600 ohm load HEADROOM Headroom is the difference between clipping level and the average signal level The Model 4650 clips at approximately 20 dBu When the control is in its full CCW rotation a RED light would indicate approximately 40 dB of headroom When the control is in its full CW rotation a RED light would indicate approximately 2 dB of headroom If the control were set at 0 a RED light would indicate approximately 20 dB of hea
3. The Noise Specification We enjoy a worldwide reputation for being the noise performance kings of the equalizer business Low noise is and always has been our main circuit design criteria We specify our noise as worst case which in this instance is 80dB referenced to 0 775 volts Many equalizer manufacturers specify their noise with all filter controls set flat While these products might make fine line amplifiers their noise spec is seriously degraded the moment their one third octave filters are used White Instruments on the other hand has developed a unique filter summation network for our R C active equalizers which we are certain will be imitated in the near future This combined with operational amplifiers which have been hand selected for low noise and careful attention to construction details yields an extremely quiet graphic equalizer Feel free to use as much EQ as you like with the Model 4650 You will notice it is markedly quieter than any other graphic you may have used with the exception of one of our costlier L C active models Line Driving Capability A Signetics 5532 Operational Amplifier known for its current handling capability is used as the output buffer It will drive a 600 ohm load to 20dB so you can hang a substantial stack of power amps on the 4650 s output An optional transformer kit which balances and isolates both the input and output can be easily installed in ten minutes Con
4. The equalizer is constructed so that the audio circuit can be floated within the chassis by use of the shield lift switch The chassis is bonded to AC ground through the power cable AC ground is also available at a screw terminal on the rear panel of the equalizer between the connectors It is not the purpose of this manual to provide a dissertation on sound system interfacing shielding grounding and safety techniques However a few comments seem to be in order NEVER remove the grounding lug from the AC power cable To do so is dangerous and unlawful in most jurisdictions Further it is unnecessary since the audio processed by this unit can be isolated from AC ground by setting the shield lift switch to the LIFT position A good technical ground can and should be achieved through the proper design and installation of the AC system The shield should not be thought of as part of the audio circuit Rather it simply helps to protect the audio circuit from airborne electrostatic and RFI noise It is a generally accepted practice to connect the shield to AC ground at only ONE end of the audio cable The other end should be left open or connected to ground through a 01 mfd capacitor Interface cables whether purchased or made should be of the highest possible quality and treated with the same respect as any other fine audio component Audio System Polarity When a positive pressure is applied to the diaphragm of a microphone the
5. HOW TO OBTAIN WARRANTY REPAIRS reete 10 HOW TO OBTAIN OUT OF WARRANTY REPAIRS 10 UNPACKING quo deut dta p DIU n don 11 THE PAGKAGE SHOULD CONTAIN THE FOLLOWING 11 ACCESSORY INSTALLATION 55 11 ACCESSORY TRANSFORMER p n 4622 INSTALLATION 11 INSTALLATION PROCEDURE 55er tte nunt ise tenete enar eire eve dede 12 ELECTRICAL CONNECTIONS i etes ee eA 12 ACCESSORY SECURITY COVER P N 4623 INSTALLATION 13 INSTALLATION PROCEDURE ato enis fund ted tus 13 HOW TO RACK MOUNT THE amp SECURITY 14 CONNECTIONS TO THE SOUND esee nennen 14 UNBALANCED OPERATION focii i 15 BALANCED OPERA PION cie 16 MODEL 4650 SPEGCIBICT 16 ACPOWER and POWER SUPPLY ien tuta a d dois 17 MAINS VOLTAGE pai aee Misa ios 17 POWER SUPPIGY Sete dece m en ae cuu 17 FUSE T C 18 POWER CORD tt ride err UR 18 MUTERELAY bd oe Bie a ms 18 FRONT PANEL CONTROLS AND F
6. MOUNTING CORD GROUND LIFT TERMINAL HOLES MAINS VOLTAGE SWITCH INPUT REMOVABLE SWITCH CONNECTORS DUST PLUG MAINS VOLTAGE SWITCH CAUTION Always make certain of the AC line voltage you are connecting to If the switch is set on 115 VAC and the equalizer is connected to 230 VAC the unit will be damaged SHIELD GROUND LIFT SWITCH This switch is provided to disconnect the Shields pins no 1 of the XLR connectors and the sleeves of the 0 25 TRS connectors and circuit common of both the Input and Output interfaces from AC Ground When this switch is in the LIFT position pins no 1 of the XLR connectors the sleeves of the 0 25 TRS connectors and circuit common will be isolated from AC Ground When this switch is in the EARTH position Audio Common will be connected to AC Ground green wire and the chassis of the equalizer Please refer to the following manual sections UNBALANCED OPERATION BALANCED OPERATION and the CIRCUIT BLOCK DIAGRAM 21 You have three options for draining the shield conductor First You may leave it unconnected at the connectors and connect it directly to the Ground Terminal Second You may drain only through Audio Common by leaving the Shield Ground Lift Switch OPEN and connecting the shield conductor to the connectors Third You may drain through both Audio Common and AC ground by CLOSING the Shield Ground Lift Switch and connecting the shield conductor to the connectors SHIELDS are u
7. be created using all of the filters Like all White Instruments equalizers a great deal of care was taken in the design and implementation of the filters to assure that they would be symmetrical between boost and cut have uniform bandwidth and extremely tight frequency tolerances The family of filter s plot tells the story Two Adjacent Filters 12dB Response High and Low Pass Filters The Model 4650 is equipped with fixed 12dB Octave band limiting filters The High Pass low cut filter is set at 16 Hz the Low Pass high cut filter is set at 35k Hz The benefit is a linear roll off of subsonic and ultrasonic components in the signal which if present can rob the amplifiers of a substantial amount of power and cause distortion A Few Words About Phase Every filter manufactured by White Instruments for audio equalization applications is a Minimum Phase Filter In fact we have yet to run into a filter manufactured by anyone for this application which is not minimum phase Phase shift of an audio signal passed through a filter is a physical fact of life The amount of shift is mathematically predictable once the parameters of the filter are known The amount of phase shift will be identical through filters with identical responses regardless of whether the filter was derived actively passively or acoustically
8. circuit MODEL 4650 SPECIFIC When the Accessory Input Output Transformer Assembly P N 4622 is installed the input and output will be transformer isolated and balanced provided that the equalizer is connected to a balanced source and load The input will load at approximately 20k ohms and the output will present a source of approximately 350 ohms When the equalizer is loaded with 600 ohms the maximum rated output with the transformers installed will be approximately 3dB less due to insertion loss in the output transformer This loss all but disappears with loads of 10k ohms or higher It should be noted that audio common is internally connected to pins no 1 of the XLR connectors and the sleeves of the 0 25 TRS connectors This path for audio common completely bypasses the accessory transformer p n 4622 This allows bonding of circuit common in the equalizer with that of its load and the component driving it Further note that when the Shield Lift Switch is closed circuit common will be referenced to AC ground green wire pins no and the sleeves 16 Model 4650 XLR pin Schematic diagram of the input showing balanced operation XLR pin 10 PHONE TIPO PHONE RING SIGNAL COMMON PHONE SLEEVE AC GROUND SHIELD LIFT EARTH AC GROUND SCREW TERMINAL Model 4650 Schematic diagram of the output O XLR pin 3 showing balanced operation XLR pin 1 PHONE TIP SIGNAL COMMON AC GROUND O PH
9. loudspeaker should move outward Although a DIN standard exists for the wiring of XLR connectors many manufacturers for one reason or another still wire their XLR connectors contrary to the standard For this reason you need to be aware of the polarity of every XLR connector in the sound system White Instruments follows the DIN standard by assigning pin 2 as audio high or and pin P3 as audio low or 14 UNBALANCED OPERATION The input to the Model 4650 is unbalanced single ended and buffered It loads at approximately 20k ohms The input connection may be made through either the XLR female connector or the 0 25 TRS connector The output from the Model 4650 is unbalanced single ended and buffered It presents a source impedance of less than 100 ohms The output connection may be made through either the XLR male connector or the 0 25 TRS connector The following drawings illustrate the circuitry and pin assignments for the Model 4650 s connectors AEE Model 4650 XLR pin 3Q Schematic diagram of the input showing unbalanced operation XLR pin 10 PHONE TIPO SIGNAL PHONE RING SIGNAL COMMON PHONE SLEEVEQ O AC GROUND SHIELD LIFT EARTH AC GROUND SCREW TERMINAL Model 4650 Schematic diagram of the output showing unbalanced operation SIGNAL SIGNAL COMMON AC GROUND PHONE SLEEVE EARTH SHIELD LIFT AC GROUND SCREW TERMINAL A shield lift switch is provided on the rear panel of the equalizer to lift
10. pins 1 of both XLR connectors as well as the sleeves of both TRS connectors from the chassis and AC Ground In the LIFT position circuit common will also be isolated from AC Ground 15 BALANCED OPERATION What is a balanced audio transmission line A balanced audio transmission line is a system which like the shield provides protection to the line from airborne electrostatic disturbances or RFI noise Two assumptions are made The two audio conductors wires are in close proximity to each other This is often accomplished by tightly twisting them together Therefore it is assumed that the airborne electrostatic disturbance is imposed on both conductors equally Both audio legs audio or high and audio or low are referenced to a common point in the audio circuit If the disturbance in fact is equally imposed on both audio legs and both audio legs are equally referenced to the common point balanced then the disturbance component of the signal does not generate an output signal To some degree the disturbance is canceled The fact that the input and or output of an audio component is balanced is a function of its circuit design not the audio interface The audio interface wire and connectors can be configured to UNbalance a balanced circuit but an UNbalanced circuit can not be balanced with the audio interface alone An UNbalanced circuit driving or terminating a balanced circuit will UNbalance the balanced
11. 2 Input Output Transformer Assembly 4623C Clear Security Cover with two rack mounting screws 4623M Metal Security Cover with two rack mounting screws ACCESSORY INSTALLATION ACCESSORY TRANSFORMER p n 4622 INSTALLATION The Model 4650 Equalizer may have its input and output transformer isolated and balanced by installing the optional Accessory Transformer Assembly kit P N 4622 CAUTION This procedure should be referred to a qualified service technician as it requires opening the unit thereby exposing a possible shock hazard The Accessory Input Output Transformer kit P N 4622 consists of the following TRANSFORMER ASSEMBLY One sealed can containing one balanced input and one balanced output transformer Four 6 32 hex nuts and four P6 lock washers for mounting One set of instructions Duplicate of this section 11 INSTALLATION PROCEDURE The tools required are a 1 4 open end wrench and a flat blade screwdriver 1 Disconnect the equalizer from AC power 2 Disconnect the equalizer from the sound system 3 Remove the equalizer from the rack 4 Place the equalizer on a soft work surface 5 Remove the equalizer s top cover as follows A Remove four 6 32 slotted panhead screws from the top edge of the rear panel B Gently pry the top cover up and off with a small flat blade screwdriver or knife BE CAREFUL NOT TO SCRATCH THE PAINT 6 Press the plastic plug out of the transformer mounting hole from in
12. D OCTAVE FILTERS BI COLOR LED EO IN OUT SWITCH LED COLOR TRANSITION CONTROL OUTPUT GAIN CONTROL Photograph Model 4660 10 125 160 200 250 315 400 500 630 800 tk 125k 16k gt 315k 4k Sk 63 Bk 10k 125k 16k 1 Four screws hold the Control Module to 2 Removing the Control Module exposes the equalizer the Filter Board and every operational am 3 A complete Troubleshoot ing Guide in plifier all in sockets in the unit the User Manual literally points to the IC associated with the complaint Replace it and your equalizer is back on line Ultimate Field Serviceability The 4650 is designed to be quickly and easily serviced in the field Access to ALL operational amplifiers is obtained through the front panel WITHOUT removing the unit from the rack and WITHOUT disturbing the equalization settings Field service is as easy as ONE TWO THREE Ultimate Customer Support Although the 4650 s ICs are fairly common spare burned in and selected parts are always available from White Instruments Should you have a control problem we will lend you a Control Module while we repair yours 12 5 dB Plot Model 465075 Family of One Third Octave Filters Controls Set to Maximum Hi we re White Instruments from Austin Texas U S A You are about to read about our latest equalizer the Model 4650 which is truly a remarkable and elegant product if we do say so ourselves as it features some fresh new ideas in the des
13. EATURES eerte 18 FILTER CONTROLS wera tesserae PURA Ue ately oan 18 LED and LED COLOR TRANSITION CONTROL 18 19 SIGNAL 19 HEADROGONIS is s 19 CLEIPPING 5 eU 19 OUIPUTUAIN CONTRODL eia ton 19 EO IN OUT S WITCH ise ut e pi ted niae 21 REAR PANEL CONTROLS AND FEATURES 21 MAINS VOLTAGE SWITCH onsite qoe p ves vios ius 21 SHIELD GROUND LIFT SWITCH 21 GROUND TERMINALE e sive Posies 22 aee Me Optat ae ml tu dta se 22 HIGH and LOW PASS FILTERS s sssccsseisesssessagesdccasenscvstagseversvszsataagesdveanevasavsaceseids 22 ONE THIRD OCTAVE FILTERS 23 Component Diasram c ce 24 Block Diagram ode tec poete cue dee qnd 25 Models 4650 and 4660 One Third Octave RC Active Equalizers Photograph Model 4650 Nous 315 40 9 63 9 100 125 160 200 250 315 400 500 630 800 1 1258 16k 2 25k 315k 4k Sk 63k E emet 12 1 m 28 ONE THIR
14. ONE SLEEVE EARTH SHIELD LIFT Y AC GROUND SCREW TERMINAL AC POWER and POWER SUPPLY MAINS VOLTAGE The Model 4650 s power transformer has dual windings which are selected by a switch located on its rear panel The switch has two positions marked 115 and 230 In the 115 position the operating range is 90 130 V A C 50 60 Hz In the 230 position the operating range is 180 260 V A C 50 60 Hz POWER SUPPLY The power supply produces regulated 18 V D C rails 17 FUSE CAUTION Use ONLY the specified Fuse The fuse is a 0 25 AMP SLO BLO for either voltage range The size is 1 25 313 or 3AG POWER CORD The equalizer is equipped with a captive 6 power cord with a NEMA 5 15P plug molded on the end This connector may be changed for operation outside of the United States MUTE RELAY An audio mute relay closes to pass the audio signal when the power supply has had time to stabilize on power up It opens to interrupt the audio signal on power down before the power supply has had time to decay FRONT PANEL CONTROLS AND FEATURES FILTER CONTROLS The 28 One Third Octave Filters are adjusted via 60mm linear potentiometers located on the front panel Each filter control has a specified range of 24dB 12dB The zero position of each linear control is marked with a detent 315 40 50 63 80 10 125 160 200 20 315 400 500 630 800 ik 1258 16k 2k 25k 315k 4k Sk 63k Sk 10k 125k 16k
15. QUALITER Riem 106 120 A instruments A seamos or C CAUTION T or I on mock 00 Models 4650 and 4660 Specifications Frequency Range Recommended Operating Level Maximum Operating Level Noise Distortion Filter Type Filter Control Centers Filter Center Frequency Tolerance Filter Controls Filter Control Range EQ In Out Switch High Pass Filter 20Hz 2dB through 20kHz 14 typical 1 3 octave filters set at center detents OdBu 0 775 volts RMS 20dBu into 600 ohms re 0 775 volts Better than 88dBu re 0 775 volts at unity gain 20kHz bandwidth Worst case Less than 0 05 THD into 600 ohms 20kHz bandwidth R C active single pole pair 28 one third octave filters on I S O standard frequency centers from 31 5Hz through 16kHz 5 60mm linear potentiometers with center detents and integral dust covers 12dB at center frequency Detent at OdB 0 5dB Front panel mounted Bypasses 1 3 octave filters only 4660 12dB octave response Continuously variable between 17Hz and 180Hz 4650 Fixed at 17Hz Low Pass Filter Gain Power Signal Headroom Clip Indicator Connectors Shield Lift Switch Input Output Circuits Input Impedance Output Impedance Power Requirements Mute Relay Dimensions and Weight Finish Ac
16. SS JUN s FILTER FILTER MUTE RELAY XLR amp PHONE 28 1 3 Oct AUDIO gt gt a gt ys 12 dB Oct 3 4 7 2 gt gt gt at 35kHz W3 1 AUDIO SS peak DETECTOR W3 2 PEAK 2 000 DETECTOR boo SHIELD y LED COLOR COMPARATOR TRANSITION INVHO9VIG 520 18 LEVEL e e cap INDICATOR e e 2 OPTIONAL OPTIONAL 3 TRANSFORMER TRANSFORMER P N 4622 P N 4822 en POWER TRANSFORMER RECTIFIER 18 VOLT REGULATOR CIRCUIT COMMON 4650 BLOCK DIAGRAM
17. This INSTALLATION NOTE is intended to help you get your new equalizer installed and working Please fill out and return the User s Service Card packed with your equalizer Your comments are always appreciated Recording your ownership of this product with us could help you recover it in the event it is lost or stolen WHAT YOU PAID FOR By choosing our product over our competition s you have made a direct contribution to the livelihood of everyone at White Instruments In all likelihood your new equalizer will be installed in a system upon which you or others depend for a living We believe we must continue to earn your trust White Instruments has manufactured your new equalizer to the highest possible quality standards within the given realm of economic reason We want you to be happy with your purchase over the long term We want you to continue to purchase and recommend our products We believe we have built our reputation and business on customer satisfaction by offering quality products personalized service instant response to field problems and no hype You our customer are the most important person in the world to us as a company If you have any problems with this product or if you have any questions please remember that we are as near as your telephone JUMP START For our customers who would like to get their new equalizer into service without reading the entire manual 1 Check to determine that you received everything you ha
18. cessories 4660 12dB octave response Continuously variable between 5 3kHz and 26kHz 4650 Fixed at 26kHz OdB to 10dB Continuously variable Two color LED Monitors input and output Lights green for power and signal below threshold Lights red for signal above threshold Threshold is continuously adjustable between 20dBu and 18dBu via front panel control XLR and redundant 0 25 TRS jacks Rear panel mounted slide switch lifts both input and output shields from AC ground Single ended buffers Optional balancing transformer assembly p n 4622 balances both input and output 20k ohms Less than 100 ohms 350 ohms with optional transformer assembly p n 4622 90 130 180 260 volts 50 60Hz AC User selectable on rear panel Mutes audio on power up and power down 3 5 8 9 cm X 19 48 3 cm rack mount x 5 12 7 cm Approximately 7 165 15 6 kg Black painted brushed aluminum White nomenclature Input output balancing transformer kit p n 4622 Matching metal security cover p n 4623M Clear plastic security cover p n 4623C We reserve the right to improve our products and to change features and specifications without notice Models 4650 and 4660 Users Manual NOTE ALL REFERENCES TO 4650 IN THIS MANUAL ARE CORRECT FOR 4660 UNLESS OTHERWISE INDICATED INTRODUCTION CONGRATULATIONS You have purchased one of the finest One Third Octave Graphic Equalizers that money can buy
19. droom CLIPPING If the control is set in its full CW rotation and the light is RED the equalizer is clipping OUTPUT GAIN CONTROL Up to 10 dB of GAIN can be added to the output signal in addition to the gain realized from boost equalization In the 0 position the equalizer is set for UNITY GAIN That is with all of the one third octave filters set to their detents the output signal will approximately equal the input signal in level Again with all of the one third octave filters set on their detents and the Output Gain Control set on 10 the output signal will be approximately 10 dB greater than the input signal During the equalization process using the one third octave filters gain is added or lost through the spectrum covered by the filters used A great deal of care should be taken when using additional output gain It is quite easy to use too much and clip the equalizer This is even more likely when a great deal of boost EQ is used 19 20 EQ IN OUT SWITCH In the OUT position the EQ In Out Switch connects the Input Buffer to the Output Buffer through the fixed High and Low Pass Filters and the variable gain stage thus by passing the One Third Octave Filters Since the EQ is by passed a level change might be noticed when using this control This depends entirely upon the settings of the One Third Octave Filters REAR PANEL CONTROLS AND FEATURES SERIAL OUTPUT AC NUMBER SHIELD CONNECTORS GROUND
20. ign and construction of a One Third Octave Graphic Equalizer Model 4650 A Professional Tool The Model 4650 is a tool for audio professionals By definition it will be installed in a system upon which someone will depend for their livelihood As a tool it will be used constantly and sometimes abused Another way of putting it is that upon installation it will have entered a contest with its owner to see who survives From a manufacturer s viewpoint if he cares there is only one way to hedge this bet Build in quality from the ground up and build in serviceability We care The task begins with a clear understanding of the product s applications features and performance necessary to match the need Single Filter 12dB Response One Third Octave Filters The Model 4650 s 28 One Third Octave Filters sum together without ripple That is to say their individual bandwidth was engineered to be sufficiently wide that when two adjacent filters are adjusted to cause a boost or cut response with an amplitude of 12dB its frequency will be centered between the two adjacent filters There will not be a significant return lobe the new response will have a smooth top or bottom For that matter a shelving response at 12dB 12dB which looks like it was drawn with a straight edge can
21. in five working days of receipt of the unit Your equalizer will be returned to you via best surface freight prepaid If you instruct us to return your equalizer via air freight it will be shipped with freight charges collect HOW TO OBTAIN OUT OF WARRANTY REPAIRS Should the required repairs not be covered by our warranty you will be charged for parts and the labor required to repair the unit Should you require an estimate of charges prior to repairing the unit you should notify White Instruments of this when returning the unit Every effort will be made to complete the repair within five working days The unit will be returned C O D unless other arrangements have been made AS a service to our customers we do not consider our Repair Department to be a profit center 10 UNPACKING Carefully unpack and inspect your new equalizer for damage Save the packing materials to assure safe transit to us in the event your equalizer should ever need factory service Immediately report any damage to the carrier Your equalizer was shipped with full insurance unless we were instructed otherwise Although White Instruments is not responsible for damage in shipping we will assist you in quickly obtaining parts and or repairs THE PAGKAGE SHOULD CONTAIN THE FOLLOWING One Model 4650 Equalizer This Manual Four Rack Mounting Screws One User Service Card ALSO ANY ORDERED ACCESSORIES WHICH MAY OR MAY NOT BE FACTORY INSTALLED 462
22. me it is possible for the equalizer to shift out of square This would make the reassembly difficult 2 Remove the rack mounting ear by removing the four 6 32 slotted panhead screws 3 Align the ear according to the following drawing LEFT SIDE PANEL RIGHT SIDE PANEL 0 Hj LJ 2 n z amp 74 I7 uw o 4 1 CD FLusH FRONT 1 2 a 2 z 2 74 2 5 a 0 RECESSED FRONT 0 RECESSED FRONT FRONT PANEL Qs FRONT NOT USED 0 UNIT FRONT gt UNIT 4 Reinstall the four 6 32 screws as shown in the drawing One drop of LOCTITE on each screw is suggested 5 Tighten the screws before removing the other rack mounting ear 6 Repeat the procedure for the other rack mounting ear 13 HOW TO RACK MOUNT THE EQ amp SECURITY COVER 1 Install the equalizer in the rack using the four screws in the four corners of the rack mounting ears 2 Install the security cover using two screws in the middle of each rack mounting ear CONNECTIONS TO THE SOUND SYSTEM The Model 4650 is connected to the sound system via two XLR connectors or two redundant 0 25 TRS connectors Interface wiring to the equalizer should be high quality two conductor shielded cable terminated with the appropriate connectors
23. nectors XLR with redundant 0 25 TRS Jacks are wired according to the DIN Standard Pin 2 High Internal Power Supply The internal power supply will operate on 115 or 230 VAC 50 60 Hz It is switched on the rear panel Gain Up to 10dB of gain is available and controlled from the front panel You will find this to be a handy feature when you use a great deal of cut equalization LED Indicator One Light Metering This idea came right out of Rock N Roll A single two color LED green red indicates the level status of the input or the output of the 4650 whichever is greater The transition from green to red is controlled by a single rotary pot from the front panel The color transition may be set to occur at a level from 20dB to 18dB depending on your particular setup and what you desire to monitor One glance at a stack of equalizers in the monitor rack for instance indicates a go or no go condition instantly Quality Components and Construction Great electrical performance would be a moot point without components and construction of equal quality Here are some of the features you will be depending on Circuit Boards Well Supported G 10 Glass Epoxy Wave Soldered Solder Masked Cleaned Integrated Circuits In Sockets 50 Hour Incoming Burn In Tested and Hand Selected 50 Hour Burn In of Finished Unit Before Final Inspection Resistors Precision Metal Film and Laser Trimmed Thick Film Linear Contr
24. ng inserting input output cables 8 Connect the equalizer to AC power WARRANTY POLICY Your White Instruments Equalizer is Warranted against defects in manufacturing workmanship and original components for a period of ONE YEAR from the date of purchase During this period White Instruments will repair or replace the equalizer at our option so long as it has not been subjected to abuse Abuse may be physical and or electrical in nature White Instruments will be the sole judge of this criteria White Instruments is the only warranty repair facility in the United States Outside of the United States White Instruments Distributors are authorized to make Warranty Repairs HOW TO OBTAIN WARRANTY REPAIRS The equalizer should be securely packed and shipped prepaid to White Instruments or one of its Authorized Offshore Distributors A return authorization is not required Our U S A shipping address may be found on our web site Contact the factory for the name and address of the Offshore Distributor nearest you A copy of your sales receipt should be included to establish the warranty date Without it we will have to rely on the serial number which indicates when we originally shipped the equalizer to a dealer A completed trouble report or letter detailing the equalizer s malfunction must be included Your name shipping address and telephone number must be included Every effort will be made to complete warranty repairs with
25. ols 60mm longest control you can get into a 3 5 package Dust Shield Custom Taper Center Detent Chassis High Quality Aluminum Alloy Precision Fabricated For Square and Fit Captive Threaded Fasteners no sheet metal screws Fasteners Treated to Resist Corrosion Brushed to Deburr Outside and Inside Primed and Painted with Catalytic Acrylic Resin Burn In and Final Inspection The semi assembled equalizer is burned in for at least 50 hours with a pink noise signal applied and a load A technician then checks every filter every function and every connection When satisfied that the unit meets specs he assembles the rack mounting ears and covers He then turns the unit over to shipping who give it a final cosmetic check before packing D O A s from White Instruments are practically nonexistent After The Sale The Model 4650 carries a One Year limited parts and service Warranty A very small percentage of our customers has ever had to use our warranty Because we realize that your livelihood depends in part on the continuing performance of our product and that our livelihood depends a great deal upon your satisfaction and repeat business we stand ready to respond instantly if we can to service or field problems related to our products A very small percentage of our customers has ever had to call our hand on this point Those who did were more than satisfied with the results TMVAC WVAC MODEL 4650 A GRAPHIC E
26. rd of an octave If this were not the case adjacent filters would not sum together gracefully This would make ripple free shelving responses for example impossible to achieve The bandwidth of the filters was selected as follows Single Filter Two Adjacent Filters 12dB Response 12dB Response When two adjacent filters were adjusted to create a response centered between them at an amplitude of 12 dB there would be less than 0 25 dB of ripple 23 a 0 2 Js 1 97 9939 1 IL JoJo JC Cee i xac p ca eae o 5 UE a 00 102 C24 Ove PUER u7 524 H H Eo UE LU a ON oz7 EF mme rs FREQ Hz DESIGNATOR DEVICE PART No SOURCE MOUNTING Dual Op Amps NE5532 Signetics Socket Quad Op Amps HA4741 Harris Socket Voltage Regulator 7818 Solder Volage Regulator 7918 Solder Bi color LED 521 9177 Dialight Solder i1 INVHOVIG LNSANOdNOO INPUT EQUAUZER pass EQUAUZER LOW PA
27. side the rear panel 7 Mount the transformer assembly as follows A Feed the transformer assembly s pigtail through the mounting hole from the outside of the equalizer B Align the transformer assembly for the printed label to read same as back panel Insert into back panel C Secure the transformer assembly with the four supplied 6 32 hex nuts and lock washers ELECTRICAL CONNECTIONS 1 Note that the keyed MOLEX connectors will only mate correctly 2 Disconnect the cable between the equalizer s filter board and input out put connectors 3 Connect the transformer s pigtail to input output connectors pigtail 4 Connect the filter board s pigtail to the transformer s pigtail 5 Install the top cover 12 ACCESSORY SECURITY COVER P N 4623 INSTALLATION The Model 4650 is normally supplied with its front panel flush with its rack mounting ears The Accessory Security Cover P N 4623 is designed to mount over the rack mounting ears flush with the front of the rack The rack mounting ears must be moved forward in order to recess the equalizer s front panel before installing the security cover INSTALLATION PROCEDURE 1 Place the equalizer on a FLAT surface CAUTION Do NOT lift the equalizer off of this surface until BOTH rack mounting ears have been reinstalled also REMOVE ONLY ONE RACK MOUNTING EAR AT A TIME The rack mounting ears hold the equalizer together If both are removed at the same ti
28. sually connected at inputs and left open at outputs GROUND TERMINAL The Ground Terminal screw terminal located between the connectors is bonded directly to the Chassis and the Ground Wire of the AC Cord green wire It is not connected through the Shield Ground Lift Switch This terminal provides a handy facility for bonding the chassis of the equalizer to those of other components in the sound system When doing this however care should be taken to avoid ground loops between chassis bonding to ground and the internal bonding to AC ground FILTERS HIGH and LOW PASS FILTERS The Model 4650 is bandlimited by a fixed High and Low Pass filter These filters attenuate unwanted subsonic and ultrasonic signals which would otherwise be amplified The response of each filter is 12 dB per Octave The 3 dB point of the High Pass Filter is set at approximately16 Hz and the 3 dB point of the Low Pass Filter is set at approximately 35 kHz Model 4650 Band 22 ONE THIRD OCTAVE FILTERS The Equalizer features twenty eight filters on I S O International Standards Organization One Third Octave Frequency Centers from 31 5 Hz through 16k Hz The range of control for each filter is 24dB 124 125dB H 1 1 Plot Model 4650 s Family of One Third Octave Filters Controls Set to Maximum Although the filters are centered on one third octave frequencies their actual bandwidth is considerably greater than one thi
29. ve paid for and that nothing appears to be damaged 2 Check the setting of the AC Mains Voltage Switch on the rear panel 3 Mount the equalizer in the rack 4 We suggest that the front panel Gain Control be initially set to unity full CCW and that the LED Color Transition Control be set somewhere near the center We also suggest the filters be set to their flat position 5 Refer to the following drawings to become familiar with the equalizer s input and output circuits and their polarity Model 4650 XLR pin Schematic diagram the input showing unbalanced operation XLR pin 10 PHONE TIPO SIGNAL PHONE RING SIGNAL COMMON PHONE GROUND EARTH AC GRHUND SCREW TERMINAL Model 4650 AER pe Schematic diagram of the output XLR pin 3 showing unbalanced operation XLR pin 1 PHONE TIP SIGNAL COMMON PHONE RING AC GROUND PHONE SLEEVE EARTH SHIELD LIFT AC GROUND SCREW TERMINAL 6 Purchase or construct the appropriate input and output interface cables Connect them to the equalizer 7 Be advised that the equalizer is not equipped with a power switch It is powered up whenever the appropriate AC is connected to its Mains Cable The equalizer is however equipped with a mute relay which prevents it from passing a signal until the power supply is up and stable It is advised that the power amplifiers be turned off or down before connecting the equalizer to AC power or removi
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