4e280e01569aaaudio_root_upre_user_manual.
Contents
1. AUDIOROOT gt uPRE Portable battery powered stereo microphone preamp with M S decoding Thank you for buying our PRE microphone preamp We hope our device will become an essential companion for your sound recordings This preamp has been designed and manufactured on the basis of extensive and detailed technical and audio considerations The Audioroot uPRE is a high quality microphone preamplifier of yet very simple use This unit benefits from the best components available in a very small package The uPRE has excellent technical and audio characteristics that make it compatible with the best microphones available The UPRE was specially designed to be used as an add on to your favorite analog mixer digital audio recorder or any other pro audio equipement The uPRE is an autonomous device that can be powered using 2 x 9V batteries or an external power source wall adapter or external Audioroot eSmart Lithium battery Warning Do not try to repair this product or replace any of it s elements if this user manual does not give specific instructions on how to do so This equipement was built with surface mount components and needs special tooling for repair The removal of the electronic PCB needs special technical skills Identification and warranty The unit s serial number is written on the silver sticker at the bottom of the battery compartment Never modify remove or damage this sticker The unit has a one year warranty from d2. V phantom power on 2 Low cut filter selection switch Py Aay e er ie HP position filter in line sz o Left position filter off line UPRE x 7 be 3 Push button link selection switch o Switch engaged button link is not active each potentiometer controls the preamplification level of each mic input o Switch disengaged button link is active the right potentiometer controls the audio level of both mic inputs The left potentiometer is disactivated 4 Low battery level LED indicator This LED turns on when the battery level is too low The user Should then replace the batteries as soon as possible The low voltage threshold is set to 13V 2 x 6 5V This threshold is compatible with iPOWERUS 9V rechargeable Lipo batteries The LED will also turn on if an external power source with a voltage lower than 13 5V is applied to the external DC IN power input jack 5 Audio modulation LED indicators The LEDs luminosity is proportionnal to the audio level 6 Batteries compartment This compartment is designed to receive 9V 6LR61 or PP3 batteries Audioroot recommends using alcaline or high power rechargeable lipo batteries Please respect the and polarities Never leave batteries in the unit during storage Use only first choice alcaline or rechargeable batteries 7 Left input gain level adjustement potentiometer Gain can be adjusted from 50dB to 65dB This potentiometer is desactivated when
3. ate of purchase Only officially appointed dealers or Audioroot are allowed to warranty repair of Audioroot products Any damage caused by tampering misuse or dismantling of the instrument will not be covered by the warranty and could be considered a reason for rendering the warranty null and void Return shipping fees are allways at the customer s charge UNPACKING AND INSPECTION The uPRE preamplifier products are carefully checked for good condition before being shipped from the factory Despite the protective carton and rugged design shipping may damage the unit Check for possible carton damage when unpacking the unit Please save the carton for return shipment if required AUDIOROOT does not warrant against damage caused by returning products in other cartons than the original ones or improperly packing the products If shipping damage is evident notify the transportation company immediately Only the consignee can file a claim with the carrier for shipping damage AUDIOROOT will fully co operate in such an event Be sure to save the carton for the shipper to inspect http www audioroot fr audioroot audioroot fr Ce document est la propri t d AUDIOROOT et ne peut tre repdroduit ou communiqu sans autorisation UNIT CONNECTIONS AND CONTROLS 1 Power supply selection switch o Central position power off 5 o On position to the right preamp on 48V phantom power off o P position to the left preamp on 48
4. ical specifications e Input impedance 5Kohms e Distorsion lt 0 1 0 01 typical e Equivalent input noise EIN 127 7dB with Zsource 2000hms e Max gain Zsource 600R Zload 100K 63 6dB e Max gain Zsource 50R Zload 100K 66 6dB e Audio bandwidth 0 5dB 10Hz 75Khz e Maximum output level Zload 100K Vin 15V 13dBU e Maximum output level Zload 600R Vin 15V OdBU http www audioroot fr audioroot audioroot fr Ce document est la propri t d AUDIOROOT et ne peut tre repdroduit ou communiqu sans autorisation
5. on switches to the left no matrixing takes place on the input signals it is then possible to record either a conventional stereo signal or to record M S sources as they are e In on position switches to the right the M S signal is decoded and converted to conventional L R stereo With M S decoding on the PRE outputs on its left channel a mixed signal of both microphones 1 2 or M S and a substraction of both microphones on the right channel 1 2 or M S TIP 2 switches are volontary used to enable M S decoding By switching only the S channel the UPRE will output a mix of microphones 1 and 2 on the left channel but will still output microphone 2 on the right channel This setup is very usefull when a mono mix of both channels is required 13 AUTONOMY The autonomy of the AUDIOROOT wuPRE depends directly from the power source battery type and microphones connected to the unit Typical autonomy with 2 iPOWERUS 520mAh lithium polymer batteries and 2 SCHOEPS CMC64Ug microphones is 5 hours This autonomy rises with dynamic microphones alcaline batteries or an external power source AUDIO INPUTS AND OUTPUTS The 2 LEFT and RIGHT mini XLR input connectors are disposed at the rear of the unit These inputs are transformer balanced with an input impedance of 5Kohms Equipement with asymetrical outputs can be connected to the uPRE by bridging pins 1 and 3 and connecting them to ground The preamp s stereo
6. output is also disposed at the rear end of the UPRE This output is asymetrical and is directly compatible with many stereo asymetrical inputs such as those found on small handheld flash recorders The user can connect this stereo output to any symmetrical input by using the stereo XLR output cable provided with each uPRE Each microphone preamp is provided with 1 PRE CABLE KIT which includes the following cables e 2 XLR mic input cables e 1 stereo XLR ouput cable e 1 stereo mini jack output cable http www audioroot fr audioroot audioroot fr Ce document est la propri t d AUDIOROOT et ne peut tre repdroduit ou communiqu sans autorisation Main specifications e 2 transformer balanced microphone inputs Lundahl LL1587 on Switchcraft mini XLR connectors e True phantom powering on both mic inputs e Second order low cut active filter on both channels 80 Hz 12dB Oct e Very large gain range 50dB a 62dB e Stereo link e M S decoding e Asymetrical outputs on one Switchcraft mini XLR connector e LED audio level indicator per channel e Low battery voltage LED indicator 13V threshold e Battery operated 2 x 9V or external DC power source 12 to 18V e Typical5 hours battery autonomy with 2 Schoeps CMC6Ug microphones e 10 hours typical battery autonomy with dynamic microphones e Compatible with iPOWERUS lipo 9V rechargeable batteries e Universal 100 240 V wall adapter available e 110 x 65 x 30mm 300 grammes Techn
7. the link push button is engaged 3 8 Right input gain level adjustement potentiometer Gain can be adjusted from 50dB to 65dB This potentiometer also controls the gain level of the left input when the link function is activated for stereo operation 3 Audioroot uPRE Cable Pinout 9 Left mic input connector This connector has the following pinout 1 ground 2 hot signal 3 cold signal Mating connector Switchcraft TA3F 10 Right mic input connector This connector has the following pinout 1 ground 2 hot signal 3 cold signal Mating connector Switchcraft TA3F 2 Hot 11 Asymetrical stereo output connector This connector has the following pinout 1 ground 2 left 3 right Mating connector Switchcraft TASF http www audioroot fr audioroot audioroot fr Ce document est la propri t d AUDIOROOT et ne peut tre repdroduit ou communiqu sans autorisation 12 External power DC input jack The mating connector reference is Switchcraft 760K The UPRE can be powered via this connector with an external voltage of 12 to 18V Batteries are automatically disconnected when a power jack is inserted into the DC input connector Connector polarity inner outer The DC IN input is protected against polarity reversal 13 M S decoding selection switches These 2 switches are purposely difficult to access they optionally insert an M S decoder on the path to the unbalanced stereo output e In off positi
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4e280e01569aaaudio_root_upre_user_manual.