Voice Channel
Contents
1. GAIN REDUCTION dB Exp Gate Thresh LI TUBE EO EO PAD INVERT VOLTAGE pou POSITION BYPASS normal na IJ xw L o f m m ym yon 3 a TOS AAT m MID 1 FREQ MID 2 FREQ 1 TA KO HIGH e OPTICAL FREOUENCY ds rm OUTPUT sou MN Sg LOW FREQUENCY 008 PHANTOM LOW THREHOLD DE ESSER POWER CUT EXPANDER Me asi ua me mwe D ou Voi SAMPLE RATEOITHER A oice a Channe A en zak m OUTPUT LEVEL nan Oa w by Com EXPANDER GATE IMPEDANCE ATTACKIMSEC RELEASESEC DE ESSERFREO THRESHOLD 208 368 12K 15 L A 0 1 kid LA 2248 248 I LI LI LI 1248 1248 Volce Channel Tube Channel Strip with Digital Connectivity USER S GUIDE APPLIED RESEARCH AND TECHNOLOGY IMPORTANT SAFETY INSTRUCTIONS READ FIRST CAUTION RISK OF ELECTRIC SHOCK A A ATTENTION RISQUE DE CHOC ELECTRIQUE NE PAS OUVRIR This symbol wherever it appears This symbol wherever it appears alerts alerts you to the presence of uninsulated you to important operating and maintenance dangerous voltage inside the enclosure Voltage instructions in the accompanying literature that may be sufficient to constitute a risk of shock Please read manual Read instructions Retain these safety and operating instructions for future reference Heed all warnings printed here and on the equipment Follow the operating instructions printed in this user guide Do not open Aside from one vacuum tube there are no use2. Wordclock Input and Thru Jacks The WORDCLOCK INPUT is used to externally sync the Voice Channel to a master clock source The BNC WORDCLOCK INPUT jack is connected directly to the BNC WORDCLOCK THRU jack providing the ability to loop through the Voice Channel and connect other devices to the wordclock sync source saving the use of a BNC T adapter The input is high impedance thus leaving the wordclock connection unterminated A 75 Ohm BNC terminator should be used on the WORDCLOCK THRU jack if the WORDCLOCK INPUT jack is used only by itself Select the EXT 16 or EXT 24 sample rate setting on the front panel to utilize External Wordclock mode Refer to FIGURE 7 for wordclock termination examples FROM 3 75 Ohm SOURCE OF TERMINATOR WORDCLOCK PLUG SIGNAL WORD WORD CLOCK CLOCK INPUT THRU Voice Channel Wordclock connection for a single unit FROM TO SOURCE OF NEXT WORDCLOCK UNIT SIGNAL WORD WORD CLOCK CLOCK INPUT THRU Voice Channel Wordclock connection for multiple units FIGURE 7 Wordclock Termination ADAT Input Jack The optical ADAT input allows the Voice Channel A D converter to synchronize to systems using ADAT optical connections The Voice Channel inserts its output in channels 1 and 2 of the ADAT stream while passing through channels 3 thru 8 Select ADAT 16 or ADAT 24 with the Sample Rate control on the front panel to enable this mode Optical Output Jack The OPTICAL OUTPUT jack works in
3. 8 Expander Gate Witch eii eu kisa sea Tenis pa cain ye UR Y KAR TOK Tan a SR Aa ON A Du Ra a pe n KA Ng Poko FAS De GG EE DAYE ER RAY Be le CRIN 8 Expander Gate Threshold Control HERE RR PEER RE H EE EEEE ESEE EEEE 8 S miParametriC EO cid 9 EQ Position SW C ner HC aa ca Da tk ess 9 EQ Bypass Sic ddei der Z a u ta aku Meade AU ego dada nn ele dt 9 Output level Control re MR sled ca cd AE pada der AN re be RUE oi 10 Output Level Met rs srl ieee arte en Wedo A chody Ye Fydd Tu We dr sr alee eee 10 Sample Rate Dither Control aan usec cee ben a DANFON nn i sonn 11 Optical OU put SW POOL PA TY pra z pan Ba ANYA n S n kk ao r babe bip aaa 11 REAR PANEL CONNECTIONS nn nn nn nn nn nn n n nn nn n n nn nn n n nn n n n nn annan nannan enan enan nen ennan nannan nannan annan 12 Mic lEineInput EAEE Me Y NN Y cee eae m n A ank kk ca Abc AF O te de 12 Mic Preamp Output ui uydin de pese aveti dv vo DYNA deo wild DA yode tee nies ed CL de deyo a D a de D dd AD NL a D did vd de D dde da ed vee 12 InsertInp t see ys ien rimes ao I LI A SO GO obi DAR Poe MN a ne Yo ooo u nn dubu Es ao Baten de a 12 Balanced RON i putita its cla to kk ana 12 A D Main Insert and A D CH21lns amp rtiuu ieu pibon bann bak Cg Re m ka a kb eddu a O ge be ko pen ek a is en tise on 12 Word lo k Input and TAruJACKS Ki E se ada 12 ADAT Input Jak viii ka aie de irene W e YL ee nen nee FEDDU K declan alana nee 13 Optical Output Jackson ei cem ee nn k
4. pre amp The rear combo jack s 1 4 T R S balanced input is lower impedance and is part of the mic pre amp The rear jack is not intended to be used with high impedance microphones or instruments NOTE When using the INSTRUMENT INPUT the PAD switch is disabled and does NOT affect the gain Gain Control This control adjusts both the mic pre amp gain as well as the instrument input gain The gain marked applies to the mic pre amp without the PAD switch depressed The instrument input gain markings are on the right side of the slash Refer to the APPLICATIONS section to learn how to optimize the gain control for low noise operation Impedance Control This knob sets the load impedance at the front and rear panel XLR inputs of the Voice Channel Use the IMPEDANCE CONTROL to subtly tune the sound of your microphone Various microphones will change their sound at differing load impedances The correct setting is subjective Adjust this control to personal taste Pad Switch This switch reduces the mic pre amp gain by up to 20dB to prevent clipping when high level mic or line level signals are applied to the balanced XLR or 1 4 T R S inputs This switch does NOT affect the 1 4 T S front panel INSTRUMENT INPUT Phantom Power The switch safely applies 48Volt phantom power to the XLR inputs Use phantom power only when the microphone that you are using requires it Doing so will extend the life of the Voice Channel as well as red
5. shorted Max gain A weighted Maximum Input Level MICRO kk kaa A 18 dBu balanced with PAD OSUNA CWYD WYW Nyd 15 dBu Maximum Gain Mic 70 dB XLR to balanced output 40 dB 1 4 to balanced output Maximum Output level Balanced ic GWNEI GY EGIN ze NT ist t s 20 dBu WnbalanCed sitas hwdi eee bean yddyd r da idad dada na DH 20 dBu Output Level At Meter O VU eee ee eee eee eee nee n nn 4 dBu Preamp 0 dB to 60 dB f3 dB to 40 dB Microphone Gain Instrument Gain Low Cut i iio A A AAA 100 Hz 1 pole 6 dB Octave EQ Boost CUT Hs de YY gr op raku ap Seaia O aaia 12 dB on each band 50 150 Hz Selectable 100 Hz to 3 KHz continuously variable 500 Hz to 15 KHz continuously variable Low Freq Tuning MID 1 Freq Tuning MID 2 Freq Tuning High Freq Tuning EEE LR ER RS AY ids Bhat nate ae 5K 15 KHz Selectable Compressor Limiter Attack TIME tk iva ER RA tt ae PB aa dana AdAS 250 uSec to 100 mSec Release Time era dua ewo dne n Jenez ik yok oak LAND gent DD UYD IWY 100 mSec to 3 Sec De esser Tuning Compression Ratio 2 5 KHz to 15 KHz continuously variable 1 1 to 20 1 11 5 Expander Slope Digital section Wordelock Range wi uy Gy YN nantes nn DIAU 30 KHz to 204 KHz Sample Rates cian ii DWY GT FF t 44 1 KHz 48 KHz 88 2 KHz 96 KHz 176 KHz 192 KHz AID Dynamic Range ee doeau ac LC Gyd nia 106 dB A weighted USB A D Dyn
6. amic Range eee ee eee eee 94 dB A weighted DIMENSIONS remota crear etree 3 50 H x 19 0 W x 9 17 D Wells 10 5 lbs Power Requirements EF FN COTE ECO M om no AOS USA 105 to 125 VAC 60 Hz Export units configured for country of destination USB Minimum System Requirements USB 1 1 compliant Windows 98SE or newer Mac OS 9 1 or newer Note 0 dBu 0 775 VRMS 0 dBV 1 VRMS ART maintains a policy of constant product improvement ART reserves the right to make changes in design or make additions to or improvements upon this product without any obligation to install same on products previously manufactured Therefore specifications are subject to change without notice 17 NOTES A R T APPLIED RESEARCH AND TECHNOLOGY www artproaudio com E mail support artproaudio com O 2006 Applied Research 8 Technology 165 5004 103 19
7. conjunction with the front panel OPTICAL OUTPUT switch to output either an ADAT formatted signal ora TOS formatted signal The front panel SAMPLE RATE DITHER control sets the sample rate dither and sync source for this output S PDIF Output Jack This connector provides S PDIF formatted digital outputs from the left and right A D converters The front panel SAMPLE RATE DITHER control sets the sample rate dither and sync source for this output AES EBU Output Jack This connector provides AES EBU signal level digital outputs from the left and right A D converters The front panel SAMPLE RATE DITHER control sets the sample rate dither and sync source for this output USB Jack The USB jack provides the output of the Voice Channel to a direct computer USB connection The Voice Channel will be recognized as a standard audio device on the PC or Mac The sample rate and bit depth of this interface is set by the computer and is independent of the front panel settings The audio data formats are limited to 32 KHz 44 1 KHz 48 KHz 16 or 24 bit encoding 13 APPLICATIONS Bypassing Components Of The Voice Channel To bypass the vacuum tube microphone preamp Use the preamp INSERT INPUT jack To bypass the Compressor Limiter Set the RATIO control fully counterclockwise to 1 1 To bypass the Expander Gate Set the EXPANDER GATE THRESHOLD control fully counterclockwise to OFF To bypass the EQ Use the EQ by
8. ding and computer audio interface needs Our second generation discrete Class A microphone preamp provides clean guiet gain while maintaining incredible transparency A powerful dynamics processor subtly controls transients and noise of the most demanding sources The ART Voice Channel s semi parametric EO offers wide tune ability and can be patched before OR after the dynamics processor Separate insertion jacks allow you to use your favorite external signal processing gear immediately after the Mic preamp and before the EG and dynamics processor Another patch point exists just before the A D converters Choose between a wide range of outputs including balanced analog output 44 1 KHz to 192 KHz AES EBU S PDIF ADAT and USB Both analog and digital meters provide a detailed indication of audio levels INSTALLATION The ART Voice ChannelTM may be used in a wide variety of applications and environments In a rack mountable all steel enclosure the unit is designed for continuous professional use Mounting location is not critical however for greater performance reliability we recommend that you not place the unit on top of power amps or other sources of heat and or strong magnetic fields The tube circuitry needs about a minute to warm up and stabilize from a cold power up AC Power Hookup The ART Voice Channel has an internal power supply Only connect the unit to mains power of the type marked on the rear panel The power source must pr
9. direct signal from the microphone preamplifier ahead of the EQ and dynamics processors This output can be used in conjunction with the INSERT INPUT jack to insert external signal processors between the main preamp section and the EQ and dynamics processing of the Voice Channel Insert Input This 1 4 T S unbalanced jack is an input to the EQ and dynamics processing sections This input can be used in conjunction with the MIC PREAMP OUTPUT jack to insert external signal processors between the main preamp section and the EQ and dynamics processing of the Voice Channel M Balanced Output The analog output of the Voice Channel is available on both a 1 4 TRS balanced jack and an XLR jack This output is active balanced and will adjust to balanced or unbalanced termination without gain change The LED and analog meter monitor the level present at this output O VU on the analog meter corresponds with 4dBu about 1 2 Volts RMS AID Main Insert and A D CH2 Insert Signal processing can be added between the analog output of the Voice Channel and the left and right channels of the A D converter by using the A D MAIN INSERT and the A D CH2 INSERT respectively Use a 1 4 T R S stereo cable The Ring is the output of the preamp and the Tip is the input to the A D converter In order to use just the A D converter and not the Voice Channel preamp simply plug a standard 1 4 T S phone cable into either A D insertion jack
10. e Mb gets dodd gd FY oun David ndd ddad Du Ne as DE nn pt by bis Risk pa o AN 13 S PDIF Output Jack dss giessen aia ananta didacticas 13 AES EBU Output Jack citar a a a n 13 USB SACK P EE Eee 13 APPLICATIONS mmmmmmmmnmnnnnn anne m en nn nn nn nn nn m nn EE en 14 Bypassing Components Of The Voice Channel eee eee nn Rene E KKK KE EK R HK RER KR EK E R KR E RER R KKK 14 Optimizing The Preamp For Lowest NoiSe isei iian teatea k spo nan bs n m bird LA b pd kaka ns Punk ske ss bon ET Ynn 14 UtiliZing Pre Post Compr ssion EQ ne senk anan eat bed nr a kk e pe kode ke p d Fok nt 14 WARRANTY INFORMATION nn nn nn nn nn nn nn n n nn nn n n nn a 15 SERVICE Lt tett tn ene 16 SPECIFICATIONS n nn nn HEHE nen 17 LIST OF FIGURES FIGURE 1 Preamp section occ n nn m n n n a n nn nn anan an annan anana eee 6 FIGURE 2 Dynamics Section tann n nn nn n nn n n n n n n n n n n n n n n n n n n n n n n n n n n n n nn n n nn enan anan an anan anana annan 6 FIGURE 3 Equalizer Section sanznnnnnnnnn n n n n n n nn n n nn nn nannan nannan anan anan nen RR nannan 9 FIGURE 4 Signal Flow Block Diagram 0 tata tenn tn n nn nn nn n n n n n n n n n n nn 10 FIGURE 5 Output Section s0nnnnnnn HEHE nee 11 FIGURE 6 Rear Panel ah tate tenten nn nn nn nn HE nen 11 FIGURE 7 Wordclock Termination kte et etann n nn nn nn nn n HEHE 13 INTRODUCTION The ART Voice Channel is the answer to your recor
11. ger back to the OFF state The Expander slope is about 1 1 5 This is subtle enough to maintain the decay envelope of the source material and still lower the noise as the input signal drops The EXPANDER GATE THRESH LED will light dimly for the first 5dB of gain reduction and then glow brightly as the attenuation increases above this level The Gate function has an intelligent detector with a fast attack and release coupled with a program dependant hold The hold time is longer for sustained passages and shorter for transients As the input drops below the threshold and the input signal is muted the EXPANDER GATE THRESH LED lights brightly You can turn off the Expander Gate function by setting the THRESHOLD control fully counterclockwise to OFF gt Breathing is the sound of the Compressor Limiter turning up the gain so quickly you can hear breathing noises between words during vocal processing Semi Parametric EQ The ART Voice Channel offers a four band semi parametric equalizer The EQ can be bypassed as well as positioned before or after the dynamics processing section Each band has 15dB of control range The High and Low EQ bands are shelving type with a switch selectable turnover point The two Mid bands can be continuously tuned over a five octave range EQ EQ POSITION BYPASS st pre po A comp CO comp active C bypass m MT m LOW MID 1 FREQ MID 2 FREQ HIGH FREQUENCY OT AA n
12. i FREQUENCY 50Hz 150Hz 5KHz 15KHz 00 3K 1 500 15K LOW MID 1 MID 2 HIGH 6aB 26aB 6aB 26aB 6aB 2 648 6aB 6dB 12dB 12dB 12dB 12dB 12dB 12dB 12dB 12dB FIGURE 3 Equalizer Section EQ Position Switch The EQ POSITION switch allows you to connect the EQ before or after the dynamics processing block This is useful in cases where the input signal needs a great deal of EQ before the Compressor Limiter processes it One example of using the EQ in the PRE position is using the LOW EQ control as a tunable low frequency cut supplementing the LOW CUT filter switch Refer to Figure 4 for the block diagram of the Tube Channel Note that the Mic preamp insert jack function is located before the EQ position switch EQ Bypass Switch This switch allows you to instantly set the EQ completely flat without loosing the current EQ settings MIC PREAMP INSERT OUTPUT INPUT PRE POST la M J X 1 Y H PRE i TEN 107 J 2 ay ata TUBE y VOLTAGE A LEFT A D S PDIF geU omerer gt AES EBU gt ADAT OUTPUTS Instrument pre amp Voice Channel 2 signal flow 4 INSERT FIGURE 4 Signal Flow Block Diagram Output Level Control The OUTPUT LEVEL control provides gain or attenuation to adjust for a variety of system operating levels This control affects the levels sent to the A D converter and to the balanced analog OUTPUT jacks Output Level Meters The ART Voice Channel provides bo
13. ill also increase the apparent reverberation and at extreme gain reduction settings lead to breathing artifacts Gain Reduction LED Meter The GAIN REDUCTION meter displays the Compressor Limiter s attenuation action The meter covers a very large range while offering high resolution The large yellow LED at the right hand end of the meter indicates Expander or Gate action The brightness of the LED indicates the amount of gain reduction for the Expander function Since the Gate is either ON or OFF there is no brightness variation Expander Gate Switch This switch allows the selection of the Expander or the Gate functions Both are useful in reducing unwanted background noise in the audio signal In the OUT position the Expander function is selected Use this mode to gradually reduce background noise and maintain some of the input dynamics This is useful for instruments with gradually decaying amplitude envelopes Depress this switch to select the Gate mode This mode quickly cuts off the noise as the input signal drops Expander Gate Threshold Control The Expander Gate action begins below the level indicated by the EXPANDER GATE THRESHOLD control The EXPANDER GATE THRESH LED in the GAIN REDUCTION display will light when the Expander or Gate attenuates the input signal The Expander Gate Threshold detector has built in hysteresis which causes the unit to trigger ON at a higher level than the level required to trig
14. ntrol signal overshoots to the A D converters as well One example is a vocal where the performer microphone combination produces a popping sound and when compressed the Compressor Limiter pumps Sometimes the use of the LOW CUT filter in the preamp section does not cut enough of this out or cuts too much of the lower midrange out of the signal to be useful Here the EQ can surgically remove this information and better optimize the overall sound WARRANTY INFORMATION Limited Warranty Applied Research and Technology will provide warranty and service for this unit in accordance with the following warrants Applied Research and Technology A R T warrants to the original purchaser that this product and the components thereof will be free from defects in workmanship and materials for a period of three years from the date of purchase Applied Research and Technology will without charge repair or replace at its option defective product or component parts upon prepaid delivery to the factory service department or authorized service center accompanied by proof of purchase date in the form ofa valid sales receipt Exclusions This warranty does not apply in the event of misuse or abuse of the product or as a result of unauthorized alterations or repairs This warranty is void if the serial number is altered defaced or removed ART reserves the right to make changes in design or make additions to or improvements upon this pr
15. oduct without any obligation to install the same on products previously manufactured ART shall not be liable for any consequential damages including without limitation damages resulting from loss of use Some states do not allow limitations of incidental or consequential damages so the above limitation or exclusion may not apply to you This warranty gives you specific rights and you may have other rights which vary from state to state For units purchased outside the United States an authorized distributor of Applied Research and Technology will provide service 15 SERVICE The following information is provided in the unlikely event that your unit requires service 1 Be sure that the unit is the cause of the problem Check to make sure the unit has the proper power supplied all cables are connected correctly and the cables themselves are in working condition 2 If you find the unit to be at fault write down a complete description of the problem including how and when the problem occurs 3 Contact our Customer Service Department at 716 297 2920 for your Return Authorization number or questions regarding technical assistance or repairs Customer Service hours are 9 00 AM to 5 00 PM Eastern Time Monday through Friday 4 Pack the unit in its original carton or a reasonable substitute The packing box is not recommended as a shipping carton Put the packaged unit in another box for shipping Print the RA number clearly on the out
16. oice Channel dynamics section consists of an above threshold Compressor Limiter with De esser plus a selectable Expander Gate The attack and release controls allow a wide range of adjustment while the complex detector assures fast response without distortion The De esser is frequency tunable Threshold Control This control sets the level above which the Compressor Limiter in the Voice Channel starts to act on the input signal As the control is turned clockwise more input signal is required to begin reducing gain The compression action can be seen in the Gain Reduction LED meter Ratio Control The RATIO control sets the amount of gain reduction that takes place based on how far the input signal is over the threshold level set by the THRESHOLD control When the control is fully counterclockwise the Compressor Limiter is OFF A good starting point for vocals is 2 5 1 To have the unit act as a limiter set the RATIO control to 20 1 De esser Control The DE ESSER control sets how much more the gain is reduced at high frequencies when using the Compressor Limiter The most common application is reducing sibilance when compressing vocals When fully counterclockwise the De esser function is OFF As the control is turned clockwise high frequency material is compressed more than mid and low frequency material De esser Freq Control This control selects which high frequencies the DE ESSER acts upon Turned fully counterclockwise
17. ovide a good ground connection and the ground pin on the mains plug should never be defeated Analog Audio Connections Audio connections to and from the Voice Channel are Front panel balanced combo input XLR Pin 2 Hot Pin 3 Cold Pin 1 Ground 1 4 Tip Hot Sleeve Ground Rear panel balanced combo input XLR Pin 2 Hot Pin 3 Cold Pin 1 Ground 1 4 Tip Hot Ring Cold Sleeve Ground Rear panel balanced 1 4 output Tip Hot Ring Cold Sleeve Ground Rear panel 1 4 insert input Tip Hot Sleeve Ground Mic Preamp Output Tip Hot Sleeve Ground A D Main 8 A D CH2 Inserts Tip Input Ring Output Sleeve Ground FRONT PANEL CONTROLS and JACKS Mic Preamp Controls The Voice Channel input consists of a discrete Class A differential preamp The circuit is optimized for low impedance microphones as well as line level signals Up to 60dB of gain is available from this stage The output can be inverted using the INVERT switch The impedance of the front and rear XLR inputs is continuously variable for fine tuning the preamp to a wide variety of mics Phantom power is available on the XLR inputs as well A selectable low cut filter removes rumble wind noise and pops thereby increasing clarity Instrument Input The 1 4 T S jack on the front panel provides a high impedance unbalanced input and when used automatically switches off the mic
18. pass switch Optimizing The Preamp For Lowest Noise The preamp of the ART Voice Channel can be optimized for low noise by combining use of the PAD and Input GAIN control for mic and line level signals NOTE The PAD control has no effect on the INSTRUMENT INPUT Front panel 1 4 input of the INPUT combo jack First bypass the Compressor Limiter Expander Gate and EQ Next center the OUTPUT LEVEL control to O dB of gain The OUTPUT LEVEL LED meter can now be used to correctly indicate the clip level of the input stage Second start with the PAD in the OUT position and the GAIN control centered Refer to the OUTPUT LEVEL LED meter s peak hold function Make sure that this meter never indicates clipping the red LED is held on after a transient The peak hold indicator can be in the yellow range or in the 5dB range of levels If the signal level is too high depress the PAD switch Third adjust the GAIN control to keep the peak levels in the 5dB range of the OUTPUT LEVEL LED meter Utilizing Pre Post Compression EQ The Equalizer section of the Voice Channel can be applied either before OR after the Compressor Limiter This function is useful in getting the best performance out of the unit Setting the Equalizer to PRE COMP is useful when the input signal contains too much low or high frequency information Compressors in general work best when the audio is equalized first This can also serve to better co
19. r serviceable parts inside Refer any service work to qualified technical personnel only Power sources Only connect the unit to mains power of the type marked on the rear panel The power source must provide a good ground connection Power cord Use the power cord with sealed mains plug appropriate for your local mains supply as provided with the equipment If the provided plug does not fit into your outlet consult your service agent Route the power cord so that it is not likely to be walked on stretched or pinched by items placed upon or against Grounding Do not defeat the grounding and polarization means of the power cord plug Do not remove or tamper with the ground connection on the power cord Ventilation Do not obstruct the ventilation slots or position the unit where the air required for ventilation is impeded If the unit is to be operated in a rack case or other furniture ensure that it is constructed to allow adequate ventilation Moisture To reduce the risk of fire or electrical shock do not expose the unit to rain moisture or use in damp or wet conditions Do not place a container of liquid on it which may spill into any openings Heat Do not locate the unit in a place close to excessive heat or direct sunlight as this could be a fire hazard Locate the unit away from any equipment which produces heat such as power supplies power amplifiers and heaters Environment Protect from excessive dirt dust heat and
20. side of the shipping box Print your return shipping address on the outside of the box 5 Include with your unit a return shipping address we cannot ship to a P O Box a copy of your purchase receipt a daytime phone number and a description of the problem 6 Ship your unit keep your manual to Yorkville Sound 4625 Witmer Industrial Estates Niagara Falls New York 14305 ATTEN REPAIR DEPARTMENT RA Fill in the following information for your reference Date of purchase Purchased from Serial number SPECIFICATIONS Input Impedance MiG Zan WD I RY dale a ad on hl a ei ie Es 150 to 3 4K Ohms variable 20K Ohms Instrument 2 5M Ohms Preamp Insert 7 5K Ohms A O Va Ara 10K Ohms Output Impedance Balanced Outputs 200 Ohms balanced Preamp Output 100 Ohms ADOS Sia kaa a dok a ad kan a da Oda 510 Ohms Frequency Response Analog In to Analog Out 12 Hz to 100 KHz 0 1 dB Analog In to Digital Out 12 Hz to 20 KHz 0 1 dB 44 1 KHz sample rate os TR coe TA ee YL Hetero YN GT FE An er GT FA RA GT Ton 16 Hz to 42 KHz 0 1 dB 96 KHz sample rate THD UKR Zea Y GT An vi ian YG Gu lt 015 typical 2010 20 KHZ cisco de ao rn lint a taba ygyd n d n lt 033 typical Equivalent Input Noise ME D ka ot ss Mae a aerated camel a 130 dBu Input shorted Max gain A weighted Instrument y 2212558 reves ou den nap gute cos even ess ddyd YA NN nee a DWYF 105 dBu Input
21. th analog and digital output meters The meters monitor the signal level just after the output control This signal is sent to both the analog and digital outputs O VU on the analog VU meter corresponds to 4dBu on the balanced outputs and about 20dB on the LED bargraph meter The LED bargraph meter indicates peak levels as well as average levels Average levels are indicated by a continuous string of LEDs being lit Peak levels are indicated by a single LED and are held for about 2 seconds The last LED in the meter is marked Clip and it indicates that the output level is set too high The A D Clip indicator LEDs act independent of the OUTPUT LEVEL meter This provides an accurate indication of A D converter clipping This is useful when using the A D insertion jacks since the level at the converters will not be indicated on the main meters when these inputs are used 10 96K 16 TOS ADAT 96K 24 a m a OPTICAL Ps aan OUTPUT ma SAMPLE RATE DITHER A APPLIED RESEARCH AN OUTPUT LEVEL dB OUTPUT LEVEL 2dB y 2dB POWER 10dB 5 MY FIGURE 5 Output Section Sample Rate Dither Control The SAMPLE RATE DITHER knob selects the sample rate for the AES EBU S PDIF and optical outputs It also selects the dither applied Set the switch appropriately to match up with 16 or 24 bit encoding NOTE This control does NOT affect the USB output Optical O
22. the DE ESSER acts on the upper mid range When set fully clockwise only the highest frequencies are reduced more during de essing compression Center the DE ESSER FREQ control as a starting point for vocal work Attack Control The ATTACK control sets the time it takes the Compressor Limiter to respond to increases in signal level by reducing gain You can use this control to shape the front end of the dynamics envelope One example is to listen to a snare hit and adjust the attack control A short attack makes the snare sound thin As the attacks go longer and the knob is turned clockwise you should hear more of the thump in the compressed snare The downside is that this creates an overshoot a large transient the length of which is the time set by the ATTACK control Overshoots less than 1 msec are very hard to hear even when they are clipped If the attack is set too fast the gain may be reduced too much and thereby create a pumping sound One way to eliminate this is to use the LOW CUT filter to remove plosive sounds in vocals that can make the detector overreact Pumping in a Compressor Limiter sounds like the signal is muted when it shouldn t be 7 Release Control The RELEASE control sets the time the Compressor Limiter takes to increase the gain after the input level drops Longer settings maintain the dynamics of the input signal while shorter settings reduce the dynamics Shorter settings w
23. tt kann nn n nn nn nn nn nn n n nn n n nn nn nn nannan anan nen en annan anana enan annan annan nannan 5 Mic Preamp Controls vu kek key nette tire DELYN ee een sl nee Ae ele O nn clans 5 Instrument INPUT ba oo nn ia Ga deba yn Dnd A vise ia NI polu etn ee ee Ns 5 Gain Control PR A E a PE EE FFURF n 5 Impedance Control bade ii god ot yi pk ok e kd kok yd n n ni kn on HF Pa KA Da Ta kb de L pain an kan FCP kn ande ed tte 5 Pad Switch es a Gan to e ti e as e ap ka Kai pe e R N kap R K nu GUS dence No 5 Phantom Power te vi Yu Wr NA di A WYL FYNY Te de NF Y FE TG DDYN ab bea AF Pe ae ae YF HC mn ei int 5 Invert SWitCh ee iets Minna defo an dded sid pics 5 low CUES WICH iii aa tees ages ts DE FN PE ET NN FFF taa 5 Tube Voltage With k pini eee Lo ches Sache hate a ca dea TT a Saag te Tok aed Soca ee ko Motte ke coca a al wate ddi Oud 6 Dynamic Processor Controls rateira i aeii oeddan vad fa a e S dan Pal bina aa Pere 7 Threshold Control scree eny dO ected a at De Yd YS sott FN YU NF EGWAN FD Y OYN vo test ee 7 Ratio Controls te goth an dik oo rel ne TN Fd gwo ap NU I nn ie state 7 De 65ser Control aie kant a ene a k kife bi kk ka FO FF DAFN kk a E ba p kk kk padan CYFF NE ke an 7 D f ss r Ereg Control ito a ve ti A uu SR ME YI ha M ke re 7 Attack CONTO iii pe pre M latte a ot nn rer idee cies 7 Release Controla ici use Meu labe koki n ta od Me ap o O tentes hr NG EY A Ba i edhe 8 Gain Reduction LED Meter 2ss aaea nine eee ei
24. ucing the possibility of shock hazard Invert Switch This switch selects the output phase of the Voice Channel There is a 180 degree phase shift through the Voice Channel when lit Low Cut Switch This switch inserts a 100Hz 6dB Oct Low Cut filter into the signal path The filter is designed to remove rumble pops and wind noise yet still sound natural AR ay 18d 60 40dB PHANTOM LOW GAN POWER ki c O OICE Channe Tube Channel Strip w Digital Connectivity IMPEDANCE 3688 1 2K ZE 150 3K FIGURE 1 Preamp section Tube Voltage Switch The vacuum tube preamp section can be adjusted to run at two different plate voltages Refer to Figure 2 for the location of the switch Choose the NORMAL setting for adding warmth to the input signal This setting has an increased amount of tube saturation at higher signal levels Choose the HIGH setting to increase overall gain headroom and bandwidth NOTE The change between tube voltage modes is gradual taking 10 to 20 seconds to be fully activated GAIN REDUCTION dB Exp Gate Thresh TUBE VOLTAGE normal TE high THREHOLD eS ESSER EXPANDER 22dB 7 248 IGATE Ke roz 40dB 20dB 1 1 OFI pak EXPANDER GATE gi saye DE ESSER o jan i ES F 0 25 100 OFF 20dB FIGURE 2 Dynamics Section 6 Dynamic Processor Controls The ART V
25. utput Switch The OPTICAL OUTPUT switch sets the signal format of the rear panel OPTICAL OUTPUT connector In ADAT mode channels 1 and 2 are the left and right A D outputs of the Voice Channel respectively NOTE If the A D insertion jacks are not being used both channels 1 and 2 carry the same signal If the ADAT INPUT is also being used channels 3 thru 8 are passed through along with channels 1 and 2 of the ART Voice Channel A D CH2 A D MAIN OUTPUT OUTPUT INSERT MIC PREAMP Mie Line INPUT Balanced INSERT INSERT Balonced INPUT OUTPUT TIP RIGHT INPUT TIP LEFT INPUT RING OUTPUT RING OUTPUT EME Lt Ff A A Ak 7 D 44 E ki ai s Ka J A AA SEZA AES EBU OUTPUT WORD CLOCK ADAT OPTICAL S PDIF USB RU INPUT TH INPUT OUTPUT OUTPUT Te Computer DI FIGURE 6 Rear Panel 11 REAR PANEL CONNECTIONS Mic Line Input This combo jack provides balanced inputs to the microphone preamplifier The XLR connection is in parallel with the front input jack XLR The input impedance of both XLR connections is variable by the front panel Impedance knob The rear 1 4 input of the combo jack overrides the front panel XLR input when used This input s impedance is NOT affected by the front panel Impedance control and is fixed at 20K Ohms The Front panel Instrument input overrides the rear jack when it is used Mic Preamp Output This 1 4 T S unbalanced jack provides a
26. vibration when operating and storing Avoid tobacco ash drink spillage and smoke especially that associated with smoke machines Handling To prevent damage to the controls and cosmetics avoid rough handling and excessive vibration Protect the controls from damage during transit Use adequate padding if you need to ship the unit To avoid injury to yourself or damage to the equipment take care when lifting moving or carrying the unit Servicing Switch off the equipment and unplug the power cord immediately if it is exposed to moisture spilled liquid objects fallen into opening or the power cord or plug becomes damaged during a lightning storm or if smoke odor or noise is noted Refer servicing to qualified technical personnel only Installation Install the unit in accordance with the instructions printed in the user guide 1 Voice Channel Tube Channel Strip with Digital Connectivity IMPORTANT SAFETY INSTRUCTIONS READ FIRST mmmanennnnnennnnnnennnnnmnmnnenmmmnnnnmmmennnnnnnnnnnnns 1 INTRODUCTION n n nn nn nent een nn men EEE UE nn mn n nn mn nn nn mn n n e a a nna anan nn nn nn nn nn nn nn anan anan nannan 4 INSTALLATION nn nn nn n n n n n nn n n nn nn nn n n n eee 4 AC Power HOOKUP is A hs cabot os tate do ba kib n k k kab TS 4 Analog Audio Connections datar me kd kte Ske ewes kk e pe a k io lo S an ooo ka ea ako ab Ye od e osadu DYT WY SA pe Re fan a 4 FRONT PANEL CONTROLS and JACKS 0 kt tt
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