EUREKA - Instrumentos
Contents
1. of a vocal and improve the overall clarity Phase Reverse Reverses the polarity of the signal Use the phase reverse when recording with more than one open microphone to combat phase cancellation between microphones INSTRUMENT 1 TS connector When an instrument is plugged into the instrument input the microphone preamplifier is bypassed and the Eureka becomes an active instrument preamplifier 2 3 COMPRESSOR lone one Q 40 dBi O Nso ox RATIO Q LOW FAST ATTACK RELEASE SIDECHAIN 10 CONTROLS amp CONNECTIONS THRESHOLD Sets the level at which compression begins The below and above LED s over the Threshold knob indicate whether the input signal is below or above the Threshold setting When the signal is above the Threshold setting it becomes eligible for compression Basically as you turn the Threshold knob counter clockwise the input signal is compressed If you have a ratio setting of greater than 1 1 RATIO Sets the compression slope This is defined as the output level versus the input level For example if you have the Ratio set to 2 1 any signal level above the Threshold setting will be compressed at a compression ratio of 2 1 This simple means that that for every 1dB of level increase into the compressor the output will only increase 12 dB thus producing a compression Gain reduction of 0 5 db As you increase the Ratio the compressor gradually becomes a limiter2. It functions as a master fader for the entire processing strip It is useful for adjusting the overall output level up or down to match the optimum input level of a recorder mixer etc GR TO METER When pushed the VU meter reads Gain Reduction of the Compressor When not pushed the VU meter reads output level 2 4 BACK PANEL BASIC LAYOUT 13 CONTROLS amp CONNECTIONS Connectors 4 TRS XLR RETURN SEND LINE MICROPHONE All Input and Output connectors are servo balanced XLR or 14 TRS with the following wiring standard XLR TRS PIN1 Sleeve GND PIN 2 Tip High PIN 3 Ring INSERT Return and Send connectors are provided for use in conjunction with audio process devices such as reverbs delays de essers etc NOTE The LINE IN jack does not work unless the LINE button on the front of the unit is pushed in 2 7 POWER SUPPLY CONTROLS amp CONNECTIONS The Power Jack on your EUREKA accepts a standard IEC cord like those found on most computers and professional recorders The Power button on the Eureka is located next to the Power Jack Note The input power voltage is set at the factory to correspond with the country in which it was shipped 15 3 OPERATION 3 1 MICROPHONES The Eureka works great with all types of microphones including dynamic ribbon and condenser microphones Dynamic microphones and ribbon microphones are generally lower o
3. 6 Va TS Instrument Input Impedance 2 242 44246eeeeseeesenennnine 1 Meg Ohm Send Connector 1 4 TRS Balanced Unbalanced 333 1 1 51 Ohms Return Connector 42eeeeeeeeennnnnnen 1 4 TRS Balanced Unbalanced Return 6 10K Ohms Metering S LED 1 0 20dBu OdBu Clip Line input switchable 7 TRS 10k Ohm Input Impedance Phantom Power Switchable 2 48V Pin 1 Pin 2 XLR Pad nia aii eis 0dB 20dB Phase 0 1 0 180 Hi pass Filter Switchable 222 esseieonnn 3dB shelf at 80Hz Compressor Threshold variable eeeeeeeeeisnennnniinnne 40dBu to 20dBu Ratio variable nasaia N 1 10 1 1 2 1 Attack 0 1 200 Release 2333 223 3233 1 0 05 35 Output 2222 6 20dB to 20dB TECHNICAL
4. A limiter is defined as a processor that limits the level of signal to the setting of the Threshold For example if you have the Threshold knob set at 0 dB and the Ratio turned fully clockwise the Compressor acts as a Limiter at 0 dB This means the signal will be limited to an output of 0 dB regardless of the input signal ATTACK Sets the speed at which the compressor acts on the input signal A slow attack time fully clockwise allows the beginning envelope of a signal commonly referred to as the initial transient to pass through the compressor uncompressed whereas a fast attack time fully counterclockwise immediately subjects the signal to the Ratio and Threshold settings of the compressor RELEASE Sets the length of time the compressor takes to return the Gain reduction back to zero no gain reduction Very short Release times can produce a very choppy or jittery sound especially in low frequency instruments such as bass guitar Very long Release times can result in an overly compressed signal sometimes referred to as squashing the sound All ranges of Release can be useful at different times however and you should experiment to become familiar with the different sound possibilities Refer to the applications section of this manual for some ideas SOFT selects Soft Knee and Hard Knee compression curves When this button is pushed in Soft knee compression curves are used otherwise hard knee compression curves
5. High Pass Sidechain Filter variable 2 222 6 10Hz to 10kHz Analog VU Gain Reduction Output Level Equalizer 1 2 20Hz 300Hz Mid iBand 4 00B seinen 2 200Hz to 3kHz High Band 100B ccccceeeececeeeeeeceeeeeeeneeeeeeeeaeeeeseeeeeeees 2kHz 20kHz Q variable all bands Q 0 4 to 2 3 octave to 2 3 octave Master 8 ana 700B to 10dB Output Connectors XLR Balanced and 1 4 TRS Balanced Unbalanced Output Impedance 4222 510hms Metering Output level 22 2 eeaseennens Analog VU 20dBu 6dBu Metering Gain reduction 222 886 Analog VU 20dB 0dB Output m Ste IKO AD werk ce 22dBu Physical Power Supply 2222esseesscennninnnnnnnnen Internally Regulated Linear Type Power Requirements factory configure 100 120VAC 200 240VAC DIZ6 anh Sols Gna cana aa 1U Rack 19 x 1 75 x 7 ME ER PS TO OO TN a 8 lbs 24 TECHNICAL As a commitmen
6. Out Wide 4 40 n a 0 na Wide 2 20k 22 4 TECHNICAL EUREKA SPECIFICATIONS GNANMEIS tet tte Bea tec ee ray tense AU eee eal at ity Mena ONE Dynamic Range nein gt 115dB 29 1 7 7 7 77 71 7 7 22dBu 111 10Hz to 50kHz Internal Operating 2 22 6 OdBu 0 8 Microphone 1 Preamplifier Gail 3 3 3 1333 111 12dB to 52dB NOISERIOOR SS aches ciate atte de ete ates 112dBu 12dB gain 11 aea wn 127dB THD Noise 0 Saturation 22 2 4442eeeeeeesiceeneinnnnn lt 0 005 THD Noise Full Saturation 22 eeeseceeeeenninnnnnnnee lt 0 5 Microphone Input Connector 22422eeeeeeeeeneenennnnnnnnnnninnnnen XLR Mic Input Impedance selectable 2 5K 1 5K 600 150 50 Ohms Instrument Input 0 6 6 2000
7. are used With Hard knee compression the gain reduction applied to the signal occurs as soon as the signal exceeds the level set by the threshold With Soft knee compression the onset of gain 11 CONTROLS amp CONNECTIONS reduction occurs gradually after the signal has exceeded the Threshold producing a more musical response to some folks 2 4 EQUALIZER PARAMETRIC EQUALIZER ORG 130 HIGH 65k 22k 12k r Se o re 1 dB 2 20 Hz Q 2 Hz 206 4 7 GAIN 5 OR y O 2 6k 8 Q 1i GAI n O O RE o O The EQ is divided into three sections or bands Low Mid and High Each band has the following controls GAIN Controls the amount of cut or boost of the corresponding frequency Each gain control offers 10dB of attenuation FREQUENCY Selects the center frequency of equalization If the gain is set to 0 this control will have no effect Q Bandwidth Controls the width of the frequency being adjusted Q is defined as the ratio of the center frequency divided by bandwidth If the gain is set to O this control will have no effect The Q on the Eureka ranges from 0 4 wide to 2 0 narrow In octaves the Q on the Eureka ranges from 3 octaves to 2 3 octaves BYPASS When pushed in the EQ is no longer equalizing the signal 12 CONTROLS amp CONNECTIONS 2 5 MASTER TRANSFORMER COUPLED CLASS A PREAMPLIFIER MASTER LEVEL This control adjusts the output level of the EUREKA
8. the EUREKA The final processed signal will be available at the EUREKA output connector The Send and Return signal will be inserted after the microphone preamplifier before the compressor 3 3 192K 24 BIT DIGITAL OUTPUT CARD OPTIONAL A 192K 24 BIT Digital Output Card is available as an option for the PreSonus EUREKA It has AES EBU and SPDIF output connectors as well as an auxiliary 1 4 TRS analog Line input connector The card has a selectable sample rate of 192kHz 96kHz 48kHz and 44 1kHz The A D converters provide psycho acoustic dithering for improved BIT resolution when conversion from 24 BIT to 16 BIT sampling is necessary The 4 TRS Line input will provide the benefit of allowing two EUREKA s to share one Digital Output Card and in so doing share both sides of the A D converter 17 OPERATION 3 4 APPLICATION SETTINGS The following are application settings to get you started in using your Eureka Feel free to experiment by pushing any and all buttons and tuming knobs to their extreme values remember there are no rules when creating music Let your imagination and ear guide and direct the way you set your Eureka Note that the application settings do not include the main preamplifier controls GAIN IMPEDANCE and SATURATE Set these preamplifier controls with the compressor and EQ in bypass for initial levels and tonal quality Use the 80Hz hi pass filter to roll off low frequency rumble and muddiness O
9. will let you fine tune the sound to suit your taste with exacting precision Bypass Switch A bypass switch is provided to audition the signal in an equalized version as compared to a direct unaffected signal Variable Q Adjusts the width of the frequency band between wide and narrow during equalization EQ COMP Switches the order of the signal chain putting EQ before the Compressor Master Section Gain Reduction to Meter Shows gain reduction on the meter implemented by the compressor Level The output of the EUREKA is adjusted by the Level control and is useful for compensating for gain loss due to compression or to decrease output signal that boosting frequencies with the Equalizer section may have caused The output is variable from 80 dB to 10 dB VU Meter The VU meter provides an accurate reading of the output level and a reference of signal presence It can also be switched to monitor gain reduction when using the compressor 2 CONTROLS amp CONNECTIONS 2 1 FRONT PANEL BASIC LAYOUT BRE courteD RY COMPRESSOR 5 C OO Q 8 OQ Sk TO Ye The front panel of the EUREKA is divided into four sections Preamplifier Compressor Equalizer and Master Preamplifier section Pe 6 Gain Control Impedance Control Saturation Control 48 Volt Switch 20db Pad Ph
10. 00 The 0 position passes a pure signal As the control is rotated to the 100 position the signal s even harmonic series is boosted giving the signal warmth very much like a vacuum tube or similar to the sound of analog tape saturation This remarkable effect gives you the sound of a tube without the headache of uneven performance often encountered with vacuum tube devices no tube to pick up RF or to age and become microphonic Variable Microphone Input Impedance This feature enables you to tune your microphone by matching the output impedance of your microphone with your microphone preamplifier This works especially well for ribbon microphones Changing the input impedance is also effective for dynamic and condenser microphones and can be the perfect solution for a given recording application Phase Reverse Use the phase reverse switch to combat phase cancellation with other open microphones Full Featured Compressor with High Pass Filter The EUREKA is equipped with a Compressor with a high pass side chain filter designed especially for frequency specific processing Soft Knee Compression Soft Knee Compression causes the compression to set in gradually producing a more musical response Bypass The Bypass switch lets you compare the compressed sound quickly to the uncompressed sound OVERVIEW 3 Band Parametric Equalizer Total tonal control is what the Equalizer section provides The EQ
11. EUREKA MICROPHONE PREAMPLIFIER COMPRESSOR PARAMETRIC EQUALIZER USER S MANUAL version 1 0 2003 PreSonus Audio Electronics Incorporated All rights reserved WARRANTY PreSonus Limited Warranty PreSonus Audio Electronics Inc warrants this product to be free of defects in material and workmanship for a period of one year from the date of original retail purchase This warranty is enforceable only by the original retail purchaser To be protected by this warranty the purchaser must complete and return the enclosed warranty card within 14 days of purchase During the warranty period PreSonus shall at its sole and absolute option either repair or replace free of charge any product that proves to be defective on inspection by PreSonus or its authorized service representative To obtain warranty service the purchaser must first call or write PreSonus at the address and telephone number printed below to obtain a Return Authorization Number and instructions of where to return the unit for service All inquiries must be accompanied by a description of the problem All authorized returns must be sent to the PreSonus repair facility postage prepaid insured and properly packaged PreSonus reserves the right to update any unit returned for repair PreSonus reserves the right to change or improve the design of the product at any time without prior notice This warranty does not cover claims for damage due to abuse neglect alteration or
12. IGH EQ gt Comp Q Gain Freq Q Gain Freq Q Gain Freq Out Wide 6 85 MN 3 2 2k na 0 n a MN Medium Narrow MW Medium Wide 5 Keyboards Compressor settings Thresh Ratio Gain Soft Bypass Attack Release SC HP 22 4 4 Out Out MF MS 60 Equalizer settings LOW MID HIGH 20 OPERATION EQ gt Comp Q Gain Freq Q Gain Freq Q Gain Freq Out Wide 3 20 MN 4 2 2k Wide 3 6 5k MN Medium Narrow 6 Kick Drum Compressor settings Thresh Ratio Gain Soft Bypass Attack Release SC HP 18 5 2 Out Out MF MF 80 Equalizer settings LOW MID HIGH EQ gt Comp Q Gain Freq Q Gain Freq Q Gain Freq In Wide 8 60 Nar 8 400 Wide 6 2 5k 7 Snare Compressor settings Thresh Ratio Gain Soft Bypass Attack Release SC HP 22 6 4 In Out Med Med 10 Equalizer settings LOW MID HIGH 21 OPERATION EQ gt Comp Q Gain Freq Q Gain Freq Q Gain Freq Out n a 0 na Med 2 1k Wide 2 20k 8 Drum Overheads Compressor settings Thresh Ratio Gain Soft Bypass Attack Release SC HP 22 5 Fast Out Out Fast Med 400 Equalizer settings LOW MID HIGH EQ gt Comp Q Gain Freq Q Gain Freq Q Gain Freq
13. ase Reverse Button 80Hz Filter Line Input Select Button LED Input Meter CONTROLS amp CONNECTIONS Compressor Section f Level Control Attack Release Ratio Threshold Gain Soft Knee Switch Bypass Switch Hi pass Sidechain Filter Equalizer Section 3Band Parametric 80 Hz Filter Switch Bypass Switch Master Section Level Control Gain Reduction to Meter Button CONTROLS amp CONNECTIONS 2 2 PREAMPLIFIER TRANSFORMER COUPLED PR 6 OdB OC LINE 48V 20dB O OO PreSonus ES 4 Q audio electronics O O iO GAIN Provides 52dB of gain for the microphone input and 44dB of gain for the instrument input IMPEDANCE SELECTOR Selects the amount of resistance that is applied to the microphone input This selector allows you to match or intentionally mismatch the input impedance of the Eureka with the impedance of your microphone As the Eureka s impedance is lowered different filtering effects can result delivering a tailored sound for a particular application SATURATION CONTROL Selects the amount of increase 0 to 100 applied to the even harmonic series of the signal being amplified by the EUREKA The effect of manipulating the harmonic distortion is of increasing or decreasing the apparent wamith of the signal This feature is derived from manipulating the drain current of the FET input buffer of th
14. attempted repair by unauthorized personnel and is limited to failures arising during normal use that are due to defects in material or workmanship in the product Any implied warranties including implied warranties of merchantability and fitness for a particular purpose are limited in duration to the length of this limited warranty Some states do not allow limitations on how long an implied warranty lasts so the above limitation may not apply to you In no event will PreSonus be liable for incidental consequential or other damages resulting from the breach of any express or implied warranty including among other things damage to property damage based on inconvenience or on loss of use of the product and to the extent permitted by law damages for personal injury Some states do not allow the exclusion of limitation of incidental or consequential damages so the above limitation or exclusion may not apply to you This warranty gives you specific legal rights and you may also have other rights which vary form state to state This warranty only applies to products sold and used in the United States of America For warranty information in all other countries please refer to your local distributor PreSonus Audio Electronics Inc 7257 Florida Blvd Baton Rouge LA 70806 225 216 7887 800 750 0323 www presonus com 2003 PreSonus Audio Electronics Incorporated All rights reserved TABLE OF CONTENTS 1 Overview 1 1 Intro
15. duction 1 2 Features 2 Controls amp Connections 2 1 Front Panel Basic Layout 2 2 Preamplifier 2 3 Compressor 2 4 Equalizer 2 5 Master 2 6 Back Panel 2 7 Power Supply 3 Operation 3 1 Microphones 3 2 Send and Return 3 3 192k 24 Bit Digital Output Card 3 4 Application Settings 4 Technical 3 5 Specifications 10 12 13 13 14 15 15 16 17 22 1 OVERVIEW 1 1 INTRODUCTION Thank you for purchasing the PreSonus EUREKA PreSonus Audio Electronics has designed the EUREKA utilizing high grade components to insure optimum performance for an infinite period of time We believe the EUREKA to be an exceptional sounding unit and an exceptional value We encourage you to contact us at 1 800 750 0323 with any questions or comments you may have regarding your PreSonus equipment PreSonus Audio Electronics is committed to constant product improvement and we value your suggestions highly We believe the best way to achieve our goal of constant product improvement is by listening to the real experts our valued customers We appreciate the support you have shown us through the purchase of this product Please pay close attention to how you connect your EUREKA to your system Improper grounding is the most common cause of noise problems found in studio or live sound environments We would like to suggest that you use this manual to familiarize yourself with the features applications and correct connection procedur
16. e for your EUREKA before trying to hook it up to your system Thank you once again for buying our product and may we wish you Good Luck and enjoy your EUREKA 1 2 FEATURES The following information is a summary of your EUREKA s features Microphone Pre Amplifier Your EUREKA contains a Class A discrete input buffer followed by a dual servo gain stage This arrangement results in ultra low noise and wide gain control allowing the EUREKA user to boost desirable signal without increasing unwanted background noise 48 Volt Phantom Power The EUREKA has 48V Phantom power available This assures optimum performance of your condenser microphones that require Phantom power and that the power supplied will be free of noise or distortion Pad A 20dB pad is available for reducing the in coming signal level This pad provides a more manageable signal from high output devices giving 4 OVERVIEW greater control over the in coming signal and a much reduced chance of over driving the input and avoiding distortion 22dBu Headroom The EUREKA mic pre has 22 dBu of headroom This feature gives you wide dynamic range and excellent transient response characteristics Saturation Control The EUREKA offers a very high quality transformer and features an SATURATION control this control adjusts the drain current on the input FET amplifier altering the even harmonic levels of the signal being passed with an adjustment range of 0 to 1
17. e Mic Preamp Experiment with the SATURATION control and see what type of sounds you can get from your present microphone selection LINE Selects the line input on the back as the input in use When using the Line input the microphone preamplifier stage is bypassed and thus the GAIN IMPEDANCE and SATURATE controls are inactive 48V The 48 volts supplied by way of the XLR connector provides power for condenser mics and any other devices requiring continuous phantom power through the XLR input This power is supplied at a constant level to prevent any degradation 9 CONTROLS amp CONNECTIONS of audio quality XLR connector wiring for Phantom Power Pin 1 GND Pin 2 48V Pin3 48V PAD Engaging the Pad switch provides 20dB of attenuation with the push of a button This is a very useful feature for rapidly reducing the level coming into the EUREKA and thus preventing the input signal from over driving distorting the input This may occur due to high output level from a microphone or other device Padding the input serves to provide increased headroom for the operator while lessening the likelihood of input signal overload 80Hz The 80Hz button is a low end roll off filter When pushed in the 80Hz button causes all frequencies below 80Hz to be attenuated dropped by 12dB This filter can be handy in live and studio applications For example the 80Hz filter can help to reduce the boominess or muddiness
18. nce you get a sound that you like go back to the IMPEDANCE and SATURATE controls to further tailor your sound 1 Vocal Compressor Settings Thresh Ratio Gain Soft Bypass Attack Release SC HP 18 6 2 In Out Mid Mid 10 Equalizer Settings LOW MID HIGH EQ gt Comp Q Gain Freq Q Gain Freq Q Gain Freq Out na 0 na Mid 2 2 2k Wide 4 20k 18 OPERATION 2 Acoustic Guitar Compressor settings Thresh Ratio Gain Soft Bypass Attack Release SC HP 20 3 2 In Out Mid Fast 10 Equalizer settings LOW MID HIGH EQ gt Comp Q Gain Freq Q Gain Freq Gain Freq Out n a 0 na Nar 2 3k Wide 3 18 5k Nar Narrow Q 3 Electric Guitar Compressor settings Thresh Ratio Gain Soft Bypass Attack Release SC HP 18 5 1 In Out Fast Mid 10 Equalizer settings LOW MID HIGH EQ gt Comp Q Gain Freq Q Gain Freq Gain Freq 19 OPERATION Out n a 0 na Mid 2 2 2k Wide 4 9k 4 Bass Guitar Compressor settings Thresh Ratio Gain Soft Bypass Attack Release SC HP 15 7 4 In Out MF MS 10 Equalizer settings LOW MID H
19. t to constant improvement PreSonus Audio Electronics Inc reserves the right to change any specification stated herein at any time in the future without notification 25
20. utput devices and require no external power source Condenser microphones are generally more sensitive than dynamic and ribbon microphones and typically require external 48V phantom power Microphone Input Impedance You can adjust the input impedance on the Eureka to match or tune a particular microphone to achieve a desired sound Most microphone preamplifiers have a fixed microphone input impedance of 1000 to 2000 ohms The Eureka has five different impedance values to select from 50 150 600 1500 and 2500 Refer to your microphone specifications to find the microphone output impedance and experiment with matching the Eureka s input impedance with the microphone s output impedance As the impedance on the Eureka is lowered a resistive load is put on the microphone This will not damage a microphone However lowering or raising the impedance can create subtle coloring and filtering effects and can be a perfect solution for a particular application 3 2 SEND AND RETURN RETURN SEND The EUREKA features 14 TRS balanced Send and Return jacks These connectors allow the use of external processors such as reverbs de essers limiters EQ s etc Simply connect the send jack balanced or unbalanced to the input of the extemal processor Then connect the EUREKA s retum jack to the output of the extemal 16 OPERATION processor The signal is now routed out of the EUREKA into the extemal processor then back into
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