Model 740 Spectral Processor User`s Manual
Contents
1. Note shield connected at one end only Since both the inputs and outputs of the Spectral Processor are floating and the unit maintains the polarity of the input signal it is unimportant which XLR wiring convention is used In the interests of international standardization we recommend that the current IEC convention pin 2 high hot pin 3 low cold is used For Unbalanced Systems Model 740 Spectral Processor Mixing Console N O Ground 2 3 1 LI OY NZ SA Note shield connected at one end only The outputs of the Spectral processor are both floating and balanced and behave similarly to a transformer output stage For use in unbalanced systems the output signal should be taken from either pin 2 and pin 3 grounded or taken from pin 3 with pin 2 grounded It is immaterial which of these two methods is used provided the same convention is used for all inputs and outputs Note Connecting an unbalanced system between either pin 2 or 3 and using pin 1 as ground will appear to work correctly but will give a reduced signal to noise ratio and an incorrect frequency response Operating level Set the line level switch located on the rear of the unit to the appropriate setting for your installation If you use standard 4 dBm 0 VU line levels set the switch to the high 4 position If you use 10 line levels use the low 6 position Some2. C Side Chain Coin E Clip Ae ao ASTA alb muy Input cip gt lt 3 NY Filters a Xe VAS gt Z S gt EY Ak A Eq m 200 8K Z N Se 2 S Os dB Low e High chan 100 4K CHANNEL When the right area of the spectrum is located re adjust the Threshold for best effect then switch the EQ mode switch to In and adjust the Mid control appropriately 22 Bringing Out Ambience Reverberation and ambience tend to have most audible effect at mid frequencies The crossover controls on the Spectral Processor will allow the width of the Mid band to be adjusted and this can be used very successfully to amplify any ambience present on a track THRESHOLD EQUALIZATION SOURCE NR OUTPUT CO mm IL mit Side Chain in 5 mer EE E x r IN Y A Xe Filters 2 re 2 EN MET s REN JA e 1 Q Sy gt ONG SS 12 200 8K CE dB In dB 14 dB 6 jou 75 ES k ap Low He Ma die 100 CHANNEL The settings shown above cover a broad range useful in enhancing ambience Adjusting the spectral balance between Mid and High allows the color of the ambience to be altered The Threshold adjustment is important in order to differentiate between lower level ambience and higher level direct sound Switching to Side Chain mode can help in locating which parts of the ambience are being boosted
3. Notice that because of the way the Spectral Processor works the ambience will only tend to be brought up when there are no other spectral components masking it In this way more ambience is perceived on the track yet the intelligibility of vocals or the clarity of the instruments is not smeared by that ambience Using the Source NR Section With low level tracks solo acoustic instruments woodwind quiet vocals there may be little or no useful detail at the extremes of the spectrum In such cases when the High or Low bands are turned up low level background hiss or rumble may become audible This unwanted low level information can be reduced in two distinct ways Low frequency and high frequency filters can be switched in to band limit the signal entering the low level processing stage so that the unwanted signals are not boosted Note that these filters do not affect the original audio signal which is passed to the output without filtering When the unwanted noise is similar in frequency to wanted low level details the Source NR control is a better solution The source NR circuit is a program dependent sliding filter that moves down the signal spectrum reducing noise when there is no signal but sliding out of the way when low level information is present The Source NR can be used irrespective of the settings of the Equalizer section To use this section as a stand alone noise reducer switch the EQ mode switch to In and
4. THRESHOLD The threshold may be set from 60 dB to 40 dB below 0 VU A setting of 50 dB means that signals We below 50 dB will be boosted by 20 dB signals above 50 dB will receive progressively less boost EY reaching unity gain at around 10 dB Turning the si control in a clockwise direction raises the threshold i e more of the signal will be fully boosted and the 60 4 Spectral Processor will have more effect on the sound CHANNEL A Above the threshold control is a 5 LED meter Normally the threshold control should be adjusted so that the center green LED is lit most often If the left orange LED is lit most often then the signal level in the processor is too low both high level and low level signals will be boosted by the processor which makes it act like a fixed gain equalizer If a signal is constantly in the high portion of the meter right side the processor will provide little boost to either low level or high level signals The red Input Clip indicator will light if the input signal level from the console is too high The signal level should be reduced by turning down the console send level to the Spectral Processor If the console send level looks reasonable then the line level switch on the rear of the Spectral processor may be incorrectly set to the low position EQUALIZATION Section EQUALIZATION L i Side Cha
5. The Spectral Processor works by adding low level signals boosted by the processing stage to the original untreated signal The Eq mode switch selects three different processing modes In Out and Side Chain IN OUT SIDE CHAIN Spectral Processing is IN and active The green IN LED will light at the upper left corner of the section The output of the unit will be the sum of the original signal and the boosted low level signals selected by the EQUALIZATION section Spectral Processing is bypassed and the signal is passed unchanged No LEDs in the equalization section are lit in this mode Only the boosted low level information from the processor the side chain signal is passed to the output This allows the addition of the original signal and the boosted low level information to be performed externally at the mixing console to allow further processing such as equalization to be used on the side chain You can also use this mode to hear what the side chain is doing which may help when adjusting the processor in the normal IN mode The red SIDE CHAIN LED will light when this mode is activated SOURCE NR Section The Spectral Processor boosts low level signals while leaving high level signals relatively unchanged It can be thought of as an audio magnifying glass which magnifies detail in selectable areas of the spectrum A side effect of this magnification is that some of the details that are magnified may
6. This SOURCE NR section uses a sliding band technique that can reduce noise present in the input signal by up to 12 dB Selectable high frequency and low frequency side chain filters are also provided to prevent unwanted signals from entering the low level processing stage SOURCE NOISE REDUCTION SIDECHAIN OUTPUT Audio Path Control Path SPECTRAL PROCESSOR BLOCK DIAGRAM ONE CHANNEL SECTION 2 SPECIFICATIONS Specifications Layout 1 U high unit containing two independent channels of Spectral Processing Stereo link switch for use with stereo material Operating levels Switch on rear of unit selects between High 4 dBu and Low 6 dBu line level operation Maximum input levels High 24 dBu Low 14 dBu Maximum output levels High 26 dBu Low 20 dBu Input and output clip LEDs indicate when maximum levels have been exceeded Inputs 3 pin female XLR connector Balanced floating 10 kohm approx Outputs 3 pin male XLR connector Balanced floating 20 ohm approx Since both the inputs and outputs of the Spectral Processor are floating and the unit maintains the polarity of the input signal it is unimportant which XLR wiring convention is used In the interests of international standardization we recommend that the current IEC convention pin 2 high hot pin 3 low cold is used Threshold Processing threshold adjustable between 60 dB and 40 dB below the
7. at low levels to unity gain at high levels This combination not only doubles the processing effect but also doubles the steepness of the filter slopes where the signal requires it improving the discrimination between boosted and non boosted areas of the spectrum Three band EQUALIZATION Control The processor stage in the Spectral Processor boosts all low level signals across the entire audio spectrum The equalization section divides the low level spectrum into three variable bands allowing the user to select which parts of the low level signal they wish to enhance The selected signals then pass on to the summing stage where they are added to the original untreated signal The EQUALIZATION section is similar to a three way loudspeaker crossover network Low Mid and High controls set the amount of boost in their respective bands while two crossover controls set the crossover frequencies between the Low Mid and High bands Source Noise Reduction The Spectral Processor boosts low level signals while leaving high level signals relatively unchanged It can be thought of as an audio magnifying glass which magnifies detail in selectable areas of the spectrum A side effect of this magnification is that some of the details that are magnified may be undesirable the most common unwanted detail which may be revealed is noise For this reason each channel contains a source noise reduction or SOURCE NR section
8. be undesirable the most common unwanted detail which may be revealed is noise For this reason each channel contains a source noise reduction or SOURCE NR section which provides two methods for reducing these undesirable effects SOURCE NF The SOURCE NR control allows adjustment of maximum noise reduction effect from 0 dB up to 12 dB and it switches the circuit OUT when the control is fully counter clockwise The green IN LED will light to indicate the circuit is in the signal path 7 Out dB 12 Filter Switches Certain unwanted signal components can also become audible when they are boosted yet they may be close in frequency to a wanted signal For this reason adjustable filters are provided in the side chain to prevent unwanted components from being boosted by the Spectral Processor These filters are effective at reducing LF rumble and mic handling noise or HF hiss on signals which do not have a significant high frequency component Note that these filters are located at the input of the processing stage and thus prevent these high and low frequency signals from entering the side chain They have no effect on the frequency response of the main path signal 16 These 3 position toggle switches control the operation of the side chain filters The LF filter is a two pole high pass Elte filter that limits the amount of low frequency boost below 100 or 200 Hz The HF filt
9. channel B Stereo Link THRESHOLD EQUALIZATION SOURCE NR OUTPUT Side Chain In Clip Active 10 10 c i9 lors dl 7 st LA 0 Input Clip 5 2 ES G Gli Sr RES i Out 32 200 SK og om 60 0 500 Hz 8k Side CHANNEL e sete BE Dos UM SD y O Ally ET High chain 100 4K Dolby Dolby Laboratories USA UK 100 Potrero Avenue Wootton Bassett San Francisco CA 94103 4813 Wiltshire SN4 8QJ Telephone 415 558 0200 Telephone 44 1793 842100 Facsimile 415 863 1373 Facsimile 44 1793 842101 Web www dolby com
10. mixing consoles that have 4 inputs and outputs may use 10 line levels for auxiliary sends returns so it may be necessary to experiment to find the best setting for your installation If you have selected the low line level setting and the Input Clip LED flashes frequently try selecting the high 4 setting If you have selected the high setting and find that you have to operate with the THRESHOLD control fully clockwise all the time try selecting the low 6 position 12 SECTION 4 FRONT PANEL CONTROLS Controls The controls on the Spectral Processor affect the operation of the signal processing section and are used to control when in terms of signal level processing effects begin and end and where in terms of frequency the effects will be heard The Model 740 Spectral Processor has two channels of processing that may be used independently or as a stereo pair Each channel is divided into four sections THRESHOLD EQUALIZATION SOURCE NR and OUTPUT THRESHOLD EQUALIZATION SOURCE NR OUTPUT OCO Jin _ Side Chain Coin E Clip Active _ a 10 3 nre Eg AS N ANY A V 2 go Je NA ih A 150 45 600 A Za 1k IR S Du A Ea 200 NA dB p NZ We p A Da en Low 100 CHANNEL A THRESHOLD Section The THRESHOLD control is used to control the level at which processing effects begin
11. nominal operating level Five LED meter indicates processor activity Equalization section Three band filter section with adjustable cross over frequencies between sections Low Mid crossover adjustable from 75 Hz to 1 kHz Mid High 500 Hz to 8 kHz Maximum boost of low level signals in each section greater than 20 dB crossover controls set to 300 Hz and 2 kHz Source NR Sliding band noise reduction section reduces noise present in the input signal by up to 12 dB Selectable high and low frequency side chain filters prevent unwanted signals from entering the low level processing stage Output Overall channel gain with processing out adjustable from 14 dB to 6 dB Output noise CCIR ARM relative to operating level EQ section out High Less than 88 dB Low Less than 82 dB EQ controls set to maximum High Less than 60 dB Low Less than 60 dB Dynamic Range Greater than 108 dB Total Harmonic Distortion 20 dB above operating level 20 Hz 20 kHz EQ out Source NR out Less than 0 1 EQ in Source NR out Less than 0 5 Dimensions 44 x 483 mm rack mounting 1 75 x 19 Maximum projection behind mounting surface 248 mm 9 76 plus a further 65 mm 2 5 for the connectors Power Required User selected voltage 50 60 Hz AC single phase nominally 100 120 220 240 V covering ranges 85 110 102 132 187 242 and 204 264 V Consumption 35 W maximum Weight 5 3 kg 11 6 lbs approx Operatin
12. the processor on a particular track Get some interesting and worthwhile results instantly 20 Extending the frequency response The Spectral Processor can be used to brighten or deepen an audio track THRESHOLD EQUALIZATION SOURCE NR OUTPUT COME min sie chan Cin O Clip Active LS lt lt AMA T rd VY 300 DE Fiere Pa Ne v lte T ENLAZA 5 i Ye e do 1 7 Do x 2 EN k gt 200 ak aA in NA WZ 500 60 0 B XM h out k Side Chain CHANNEL Set the Threshold so that the center and left green LEDs are lit and use only the High band as you would a shelf equalizer This will put a very clean very high top on a sound For example putting air around vocals without bringing up sibilants or bringing acoustic instruments closer THRESHOLD EQUALIZATION SOURCE NR OUTPUT L J Side Chain In e Active 10 10 6 MESES sa E pio x ZN L 72 A lt Pa 24 Filters dp E all ANA a AN 7 m m u TS NR lant 600 2 EY Ak AA SIN Fa gt 200 8K NI NW J dB 6 dB C N dB ja ZA Ne out Jel Low 100 4K CHANNEL Alternatively with the Threshold control set to light predominantly the center green LED use the Low band only to add depth to the sound this is excellent for making the rhythm track fatte
13. DO Dolby Model 740 Spectral Processor EQUALIZATION in m Side Chain Ne 272 A 2 7 v 150 Users Manual Users Manual For Model 740 Spectral Processor Dolby Laboratories Incorporated U S A 100 Potrero Avenue San Francisco CA 94103 Tel 415 558 0200 Fax 415 863 1373 U K Wootton Bassett Wiltshire SN4 8QJ Tel 44 1793 842100 Fax 44 1793 842101 Web www dolby com WARRANTY INFORMATION USA warranty on the product covered by this manual is subject to the limitations and disclaimers set forth in the warranty disclaimer originally shipped with the product and also printed on the back of the invoice All requests for repairs or information should include the unit serial number to assure rapid service Dolby and the double D are registered trademarks of Dolby Laboratories 1997 Dolby Laboratories ISSUE 3 S97 9575 11640 Part No 91291 TABLE OF CONTENTS Section 1 How it works 1 Low level Processing a new idea 1 The Gain Elements rann ror rn nan 2 Combining Fixed and Sliding Bands 2 Multi level Processing 2 Three band EQUALIZATION Control 2 Source Noise Reduction 3 Section 2 Specifications Specifications 5 Section 3 Installati
14. ad O La unidad debe ser puesta a tierra conect ndola a un conector de red correctamente cableado y puesto a tierra O El cable de red suministrado con esta unidad debe ser cableado como sigue Vivo Marr n Neutro Azul Tierra Verde Amarillo 9 VIKTIGA S KERHETS TG RDER Denna enhet uppfyller sakerhetsstandard IEC65 F r att garantera s kerheten och gardera mot eventuell elchock eller brandrisk m ste f ljande observeras Kontrollera att sp nningsv ljaren r inst lld p korrekt n tsp nning Konrollera att s kringarna r av r tt typ och f r r tt str mstyrka s som anvisningarna p enheten f reskriver Enheten m ste vara jordad genom anslutning till ett korrekt kopplat och jordat el uttag El sladden som medf ljer denna enhet m ste kopplas enligt foljande Fas Brun Neutral Bl Jord Gr n Gul 32 ND BELANGRIJK VEILIGHEIDS VOORSCHRIFT Deze unit voldoet aan de IEC65 veiligheids standaards Voor een veilig gebruik en om het gevaar van electrische schokken en het risico van brand te vermijden dienen de volgende regels in acht te worden genomen O Controleer of de spanningscaroussel op het juiste Voltage staat o Gebruik alleen zekeringen van de aangegeven typen en waarden o Aansluiting van de unit alleen aan een geaarde wandcontactdoos De netkabel die met de unit wordt geleverd moet als volgt worden aangesloten Fase Bruin Nul Blauw Aarde Groen Geel __ channel A
15. ctral Processor is a unique two channel dynamic equalizer that allows the creative recording engineer to bring out the low level detail without affecting louder signals or transients At the heart of the Spectral Processor is a complex multi band processor though the unit itself is very easy to use Refer to the block diagram located at the end of this Section Low level Processing a new idea The Spectral Processor works by boosting all low level information using a sophisticated processing stage This boosted signal is then passed to a three band equalizer section to allow the user to select the appropriate parts of the spectrum The output of the equalizer is then added to the original untreated signal as shown below so that the output of the Spectral Processor consists of a signal where the low level detail is enhanced but high level signals remain unaltered Boosted low level signals Bis SWS Shee nee PROCESSOR EQUALIZATION Boosts all low level signals High High level signals attenuated INPUT Original untreated signal The key to producing a signal that sounds quite natural even though the low level signals have been increased by up to 20 dB is in the design of the processing stage There are 3 notable aspects to this processing stage e The gain elements fixed and sliding bands e How these elements are combined e multi level approach The Gain Elements fixed ba
16. d the power outlet SEE SECTION 6 APPENDIX A FOR IMPORTANT INFORMATION ON WIRING CONVENTIONS Note For some markets the unit is supplied with a three wire power cord with a three pin polarized plug for connection to a power source and a safety ground earth The ground terminal of the plug is directly connected to the chassis of the model 740 For continued protection against electric shock a three pin power receptacle MUST be used and the ground wire MUST always be connected DO NOT use a ground lifting adaptor and NEVER cut the ground pin of a three pin plug Connections For the United Kingdom WARNING THIS APPARATUS MUST BE EARTHED As the colours of the cores in the mains lead may not correspond with the coloured markings identifying the terminals in your plug proceed as follows The core which is coloured green and yellow must be connected to the terminal in the plug which is marked with the letter E or by the earth symbol or coloured green or green and yellow e core which is coloured blue must be connected to the terminal which is marked with the letter N or coloured black core which is coloured brown must be connected to the terminal which is marked with the letter L or coloured red 10 Audio Connections Input and output connection to the Spectral Processor are made by three pin XLR connectors For Balanced Systems Model 740 Mixing Console Spectral Processor Ground
17. er is a two pole low pass filter 200 limits the amount of boost above 4 kHz or 8 kHz The filters operate independently from the SOURCE NR control and be switched or out of circuit regardless of the 100 setting of the SOURCE NR control OUTPUT Level Control OUTPUT Allows adjustment of the output level of the Spectral ci Processor to match other equipment The red Clip LED will light to indicate clipping in the output stage Turn down the OUTPUT control to prevent clipping in this case kt dm 14 0 1 a eR b ITM dB Stereo Link Switch lolby Processor 740 Stereo Link 40 The STEREO LINK switch allows the Spectral Processor to be used on stereo programs without dynamically shifting the left right balance of the material In this mode the higher control signal in each band of the multi band processor will control that band in both channels If it is more desirable to force one channel to be slaved to the other adjust the THRESHOLD control of the channel you wish to be the slave so that it is fully clockwise Note that the STEREO LINK switch only affects the operation of the low level processing stage The EQUALIZATION and SOURCE NR controls are not affected and are still independent and must be set manually Power LED 000 Spectral P Model Power The POWER LED provides operational status for the unit as fol
18. g Temp Range 0 to 40 degrees C Power Status A green LED indicates status constant brightness indicates that all power supply rails are present flashing indicates a fault Note 0 dBu is defined as 0 775 V without regard to impedance SECTION 3 INSTALLATION Installation Unpack the unit from its box and check for any damage Be sure to check the packing material for the power line cord and spare fuses Before mounting the unit in a rack or flight case check the setting of the voltage selector and that the appropriate fuse is fitted to the unit as follows Step 1 Using a small flat bladed screwdriver lever open the voltage selector fuse holder compartment door in the power supply input connector Rotate the voltage selector drum until it reads the correct voltage for the installation The drum may also be removed from the housing and replaced with the correct voltage displayed it will only fit one way round wt 4 OCTAGONAL PEG i 7 ROUND PEG VOLTAGE SELECTOR WHEEL SPARE FUSE LOWER FUSE A2F4037 Step 2 Check that the correct value fuse is fitted WARNING To reduce the risk of fire use the correct rating and type of fuse For 100 110V use 500 mA 4 x 174 slow blow fuse For 220 240 V use T200 mA 5 x 20 mm time lag Close the compartment door making sure that it clicks firmly into place Power Connections Connect the power cable between the model 740 Spectral Processor an
19. in 10 10 DS E vul m gt lt RS O 300 2k s 7 150 600 1k Ak 7 Eq 0 20 0 20 0 20 dB dB dB In z z N Out 75 1k 500 8k Side Low NE Mid im High chain Low Mid and High controls set the amount of boost applied to low level signals in each of the three frequency bands When a control is fully counter clockwise no boost will be applied to the low level signals in that band If the control is fully clockwise low level signals in that band will be boosted by 20 dB The Low Mid and High bands have center frequencies of 80 Hz 800 Hz and 8 kHz respectively when the crossover controls are in the center detent position Crossover Control These two controls set the crossover frequencies between the High Mid and Low bands similar to the crossovers in a three way loudspeaker system With the controls at their center detent position the crossover between the Low and Mid bands is at 300 Hz and the crossover between the Mid and High is at 2 kHz Note that the three bands always cover the whole audio spectrum such that for example making the Mid band wider will simultaneously make the Low and High 14 bands narrower For this reason these controls are most effective when the Low Mid and High bands are set differently If all bands are at similar boost settings the Crossover controls will be less effective EQUALIZATION Mode Switch
20. lows OFF no power is applied to the unit or there is a complete power supply failure ON normal operation FLASH there is a power supply malfunction or an error in the installation of one of the internal processor boards Check to see that the voltage selector switch near the power cord input has been set correctly for your line voltage before returning your unit for service 18 SECTION 5 GETTING STARTED The Dolby Spectral Processor is a unique dynamic equalizer It unlocks new possibilities in audio sweetening with effects ranging from very subtle to very obvious It acts like an equalizer that works on signal details boosting the low level information present in the original signal The Spectral Processor acts only on low level signals those below a certain Threshold Adjusting the Threshold control is possibly the best way to appreciate how the Spectral Processor will affect sounds Switching the EQ to the Side Chain position can be particularly helpful here as the processed low level signals are sent directly to the output enabling the user to hear very clearly where the processing is being applied THRESHOLD EQUALIZATION SOURCE NR OUTPUT CIE En sn Ein Clip Active Kay un C 10 Su I RRO TX N o E TY zl JE 2k TY JE Filters JE BN js 1 2 JE E AUS IN N A A JN NS AS 1 DT SX IN 3 x A VE 7 ZNE AA QE
21. nds and sliding bands The processing stage actually contains eight processors that partition the incoming signal in terms of both frequency and level These processors work in pairs of one fixed band stage and one sliding band stage The sliding bands provide a constant amount of boost in a frequency band that can slide up and down the audio spectrum while the fixed bands provide a variable amount of boost in bands which are fixed in frequency The optimum boost for some signals may be provided by a sliding band processor whereas for another signal a fixed band processor may be better Combining Fixed and Sliding Bands The key to the processing is how these bands work together their outputs are combined in a unique way to gain the benefits of both approaches without the drawbacks of either For any part of the spectrum the output of the band that provides the most boost is used resulting in great flexibility in boosting low level elements Multi level Processing There are four of these fixed band sliding band pairs two for high frequencies and two for low frequencies Within each frequency range the pairs of bands are arranged so that one pair boosts low level signals reducing its gain to unity at medium levels where the second pair takes over providing boost for low level and medium level signals gradually reducing its gain to unity at around 0 VU The two pairs of bands combine to create a smooth transition from a gain of more than 20 dB
22. oh PE 200 4 AZE T A NZ B e S 60 40 75 1k 50 yp M 2 Hz Mid He High chan 100 T n CHANNEL Switch to Side Chain set the crossover controls to their detent position of 300 Hz and 2 kHz and set the Low Mid and High level controls to 10 Now sweep the Threshold control up and down and listen to how the low level details change The audible signal in this mode is the effect that will be mixed with the original input when the EQ mode switch is switched to IN THRESHOLD EQUALIZATION SOURCE NR OUTPUT SOD sce cin PR P Im z Dep Active Ee E a CS gt TY X Ne Filters P SE is N E gt E SX ar Q x a A de Low n E di 100 CHANNEL To get an understanding of the crossover controls try the following example While still in the Side Chain mode listen to just one frequency band by turning down the levels in the other two Alter the Crossover frequencies to see how they affect each band Note that the Mid band is affected by both upper and lower Crossovers Now switch between EQ In and EQ Out to hear the effect of adding this Low level detail to the main signal to create spectrally processed audio Some General Techniques The settings given in the following section are intended as a starting point from which new users should be able to Develop a feel for how best to use
23. on installati ns naine 9 Power Connections 10 Audio Connections 11 For Balanced Systems 11 For Unbalanced Systems 11 Operating level 12 Section 4 Front panel Controls Cont anneer ote eoe len 13 Threshold Section ss 13 Equalization Section anne 14 Crossover 14 Equalization Mode Switch rr ra 15 Source NR Section 16 Filter SWITGheS ses 16 Output Level Control 17 Stereo Link Switch ee ee ee usus s 18 POWERED toro gran 18 Section 5 Getting Started Some General Techniques 20 Extending the frequency response 21 Emphasizing Mid Range Frequencies 22 Bringing Out 23 Using the Source NR Section 24 Using the Side Chain Output 25 Section 6 Appendix A Safely A veut ve e ayasa yaya 27 Sheets for recording control settings 34 SECTION 1 HOW IT WORKS Introduction The Dolby Model 740 Spe
24. r or to restore the LF to a bass guitar that has lost something after being recorded at 30 ips Using both of the above techniques at the same time on a finished stereo mix can extend the perceived frequency response and is capable of adding sparkle and depth to just about any track working as an intelligent HiFi Loudness button Emphasizing Mid Range Frequencies When detail is buried within a track a useful technique is to use the Mid band alone sweeping the spectrum using the two crossover controls together to locate the signal you want to boost THRESHOLD EQUALIZATION SOURCE NR OUTPUT OOM Millie ran Cin clip Active i 6 se TER o 50 zt DEMO 2 J Filters A gt 5 HS ZAK WAN P 20 2 47 20 gg 12 200 7 AZ o SY NA ocg Oel 75 500 ge Low Mid High chan 100 4K CHANNEL Adjust the Threshold so that the center green LED is lit most of the time and set the Mid level control to 10 Switch the EQ mode switch to Side Chain and sweep the two crossover controls up and down together keeping them at roughly the same angle Though this may seem to give a broad Mid frequency range you will find that the Spectral Processor selectively boosts only those details in that area which are below the threshold THRESHOLD EQUALIZATION SOURCE NR OUTPUT CIC
25. rt mit den Angaben au f dem Ger t bereinstimmen o Die Erdung des Ger tes mu Uber eine geerdete Steckdose gewahrleistet sein o Das mitgelieferte Netzkabel muB wie folgt verdrahtet werden Phase braun Nulleiter blau Erde gr n gelb QD NORME DI SICUREZZA IMPORTANTE Questa apparecchiatura stata costruita in accordo alle norme di sicurezza IEC 65 Per una perfetta sicurezza ed al fine di evitare eventuali rischi di scossa lettrica o d incendio vanno osservate le seguenti misure di sicurezza O Assicurarsi che il selettore di cambio tensione sia posizionato sul valore corretto o Assicurarsi che la portata ed il tipo di fusibili siano quelli prescritti dalla casa costruttrice O L apparecchiatura deve avere un collegamento di messa a terra ben eseguito anche la connessione rete deve avere un collegamento a terra II cavo di alimentazione a corredo dell apparecchiatura deve essere collegato come segue Filo tensione Marrone Neutro Blu Massa Verde Giallo 30 AVISO IMPORTANTE DE SEGURIDAD Esta unidad cumple con la norma de seguridad IEC65 Para asegurarse un funcionamiento seguro y prevenir cualquier posible peligro de descarga o riesgo de incendio se han de observar las siguientes precauciones O Asegurese que el selector de tensi n est ajustado a la tensi n correcta para su alimentaci n Asegurese que los fusibles colocados son del tipo valor correctos tal como se marca en la unid
26. selector ensure that it is set to the correct mains voltage for your supply If there is no voltage selector ensure that your supply is in the correct range for the input requirement of the unit O Ensure fuses fitted are the correct rating and type as marked on the unit O The unit must be earthed by connecting to a correctly wired and earthed power outlet o The power cord supplied with this unit must be wired as follows Live Brown Neutral Blue Earth Green Yellow CE IMPORTANT NOTE DE SECURITE Ce materiel est conforme la norme IEC65 Pour vous assurer d un fonctionnement sans danger et de pr venir tout choc lectrique ou tout risque d incendie veillez a observer les recommandations suivantes O Le selecteur de tension doit tre plac sur la valeur correspondante votre alimentation r seau O Les fusibles doivent correspondre a la valeur indiqu e sur le materiel O Le materiel doit amp tre correctement reli a la terre O Le cordon secteur livr avec le materiel doit tre cabl de la mani re suivante Phase Brun Neutre Bleu Terre Vert Jaune 28 WICHTIGER SICHERHEITSHINWEIS Dieses Ger t entspricht der Sicherheitsnorm IEC65 F r das sichere Funktionieren des Ger tes und zur Unfallverh tung elektrischer Schlag Feuer sind die folgenden Regeln unbedingt einzuhalten o Der Spannungswahler mu auf Ihre Netzspannung eingestellt sein o Die Sicherungen m ssen in Type und Stromwe
27. set the Low Mid and High controls to minimum 24 Using the Side Chain Output Normally the Spectral Processor will be used in line or switched into the signal path using channel inserts It is also possible however to use the Spectral Processor on an Aux send Use the Side Chain mode and mix the return from the Spectral Processor with the original signal just as would be done for reverb units A graphic equalizer or a Hi Q parametric could be used for example in addition to the High Mid and Low controls to bring out a very specific portion of the spectrum Spectral Processor Aux Return Send or line input Outboard EQ optional Console EQ Console EQ Input Typical set up to use the Spectral Processor in Side Chain mode either with an external EQ or using the console EQ This concludes the Getting Started section of the manual At the end of this manual you will find some recall sheets that can be used to record the control settings of the Spectral Processor for future use More detailed information on how the Spectral Processor works can be found in section 1 How it Works and section 4 Front panel Controls SECTION 6 APPENDIX A IMPORTANT SAFETY NOTICE This unit complies with the safety standard IEC65 To ensure safe operation and to guard against potential shock hazard or risk of fire the following must be observed O If the unit has a voltage
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