Sound Devices - USBPre 2 User Guide and
Contents
1. SOUNDS DEVICES 49 28 M 20 16 12 8 i E J 4 tad x e A a4 U 2 2 48V PH USBPre 2 User Guide and Technical Information Sound Devices LLC 300 Wengel Drive Reedsburg WI USA 1 608 524 0625 fax 1 608 524 0655 Toll Free 800 505 0625 www sounddevices com support sounddevices com USBPre 2 User Guide and Technical Information iv Features and specifications are subject to change Visit www sounddevices com for the latest documentation Table of Contents Table of Contents cass mesi did ooa xao doi 1 Computer System Requirements 2 Quick Start Guide 3 Sound Card Connection 0 0 0 c eee sess 3 Front Panel Descriptions 5 Input and Output Panel Descriptions 6 Back Panel Descriptions 6 DIP Switch Options Luusese 7 Mac OS Installation and Connection 8 OS X Audio MIDI Setup 0c eee eee 8 Adjusting Sample Rate in OS X 00 cece eee eee 8 Windows Installation and Connection 9 Windows 7 and Vista Sound Control Panel 9 Adjusting Sample Rate in Windows 7 and Vista 10 Windows XP Sound Control Panel 005 11 l f T 12 Input Source Selection 0 cece eee eens 12 Microphone InputS 00 cece eee eens 12 Phantom POWEI s utsos aids exie reiros2. SOUND DEVICES LLC DISCLAIMS ALL OTHER WARRANTIES EXPRESS OR IMPLIED INCLUDING WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE SOUND DEVICES LLC IS NOT RESPONSIBLE FOR SPECIAL INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING FROM ANY BREACH OF WARRANTY OR UNDER ANY OTHER LEGAL THEORY Because some jurisdictions do not permit the exclusion or limitations set forth above they may not apply in all cases For all service including warranty repair please contact Sound Devices for an RMA return mer chandise authorization before sending your unit in for repair Product returned without an RMA number may experience delays in repair When sending a unit for repair please do not include accesso ries including carry cases cables or adapters unless instructed by Sound Devices Sound Devices LLC Service Repair RMA XXXXX 300 Wengel Drive Reedsburg WI 53959 USA telephone 608 524 0625 Technical Support Bug Reports For technical support and bug reporting on all Sound Devices products contact Sound Devices LLC E mail support sounddevices com web www sounddevices com support Telephone 1 608 524 0625 Toll Free in the U S A 800 505 0625 Fax 1 608 524 0655 ED Features and specifications are subject to change Visit www sounddevices com for the latest documentation USBPre 2 User Guide and Technical Information CE Declaration of Conformity According to ISO IEC Guide 22 Sound Devices LLC 3
3. 2 User Guide and Technical Information High Performance Playback The USBPre 2 can provide high quality audio output from a computer to reference monitors in a studio control room or a home stereo system Depending on the connectivity of the monitors the bal anced XLR outputs unbalanced RCA outputs or digital S PDIF outputs can be used to send com puter audio to the monitors Monitors E RIGHT Power amplifier input Power amplifier SOUND DEVICES USBPre 2 User Guide and Technical Information Block Diagram eene Interface mode Stand Alone mode Digital Mic gt B Line A D Converter ie AUX ee ToPC l i wes From PC LOOP etn CH2 Only CH1 Left signal D A Headphone Monitor Converter Output Mix Knob Mono Stereo O AUX Main lt OX DIP B6 DIP B3 Q Output 4 amp e Digital Output Hi Features and specifications are subject to change Visit www sounddevices com for the latest documentation Specifications Frequency Response reference 1 kHz at 96 kHz Sample Rate THD N 22 Hz 22 kHz measurement band width E I N MIC inputs Input Clipping Level 1 THD Input Sensitivity typical for 0 dBFS Input Impedance actual Input Limiter Threshold Low Cut Output Clipping Level 1 THD PC controlled output levels at max Output Impedance S PDIF Digital A D Converter D A Converter Analog Gain Sample Rates Bit Depths Master Clock
4. baisde ii pabon 12 Cw OUt PiE 20 vies aipeoniseesdibeanhecsaihes 204 12 INOUE P OU acccanisosatheseiersaseeausges EU eea 13 INDUL LIMMMGIS cess Cox eciseEkkxrreirsrwiaresrsbemQis 13 WSN m 13 AUX INDUS a ia ope doaa BEER OERR ER Edd edP dE Rd 13 Baleli ne U SERRET E EEE E aus 13 Input 2 Loop Source 623456 eiiis wn 3 P poro 04 8 65 13 Outputs and Monitoring LL 14 Headphone Output 0 cece eee ees 14 Main QUIDUISs oi2s0 heneeeeeeeseesadsteeoicacans 14 Digital OUPS Ec cm 14 cg P rcP 14 Stand Alone Mode uuuseess 15 Sample Rate cece cece cece eee eee enes 15 Locking Sample Rate to External Sources 15 Setup Examples ssluseeeeese 16 Test and Measurement 00 cece eee 16 High Performance Playback sssssssss A7 Block Diagral siccmetiwbriewrumiweR PW 18 Specifications us oaa Ped brun 2e sad ed cdd 19 Warranty and Technical Support 20 CE Declaration of Conformity 21 SOUND DEVICES USBPre 2 User Guide and Technical Information USBPre 2 User Guide and Technical Information Copyright and Release All rights reserved No part of this publication may be reproduced stored in a retrieval system or transmitted in any form or by any means electronic mechanical photocopying recording or otherwise without the expressed written permission of SOUND DEVICES LLC SOUND DEVICES is
5. not responsible for any use of this information SOUND DEVICES LLC shall not be liable to the purchaser of this product or third parties for damages losses costs or expenses incurred by purchaser or third parties as a result of accident misuse or abuse of this product or unauthorized modifications repairs or alterations to this product or failure to strictly comply with SOUND DEVICES LLC s operating and installation instructions Microsoft Windows is a registered trademark of Microsoft Corporation Macintosh is a registered trademark of Apple Inc Other product and company names mentioned herein may be the trademarks of their respective owners The sound waves logo is a registered trademark of Sound Devices LLC Computer System Requirements The requirements below outline the minimum configurations for systems using the USBPre 2 Soft ware applications used with the USBPre 2 have their own requirements that may be in addition to the requirements of the USBPre 2 Consult your software s documentation Operating Systems Windows XP SP3 Windows Vista Windows 7 both 32 and 64 bit Macintosh OS 10 4 or greater Linux Kernel 2 6 0 or greater Requires standard ALSA snd usb audio module USB Connection Full USB 1 1 or 2 0 compliance For Notebook Computer users For proper operation of the USBPre turn off all power management when using the USBPre for audio recording Power management reduces processor speed system bus speed
6. to an input SOUND DEVICES USBPre 2 User Guide and Technical Information Outputs and Monitoring Headphone Output The USBPre 2 has a high current headphone amplifier for monitoring analog input audio computer audio or a mix of both The Headphone Volume Control adjusts the level of the signal to the head phones The Headphone Volume Control knob and the Output Gain Control knob can be swapped with the back panel DIP Switches See DIP Switch Options Caution The USBPre 2 is capable of driving headphones to dangerously high levels Be aware of head phone level controls at all times Use the Monitor Mix Control on the front panel to adjust the mix between direct audio from the in puts fully counter clockwise and output audio from the computer fully clockwise The signal for input audio is derived from the inputs before analog to digital conversion Headphone Mono mode sums the input signals from both inputs into a mono mix for the head phones To toggle Headphone Mono mode push the Headphone Mono button on the front panel The Headphone Mono LED will illuminate when Headphone Mono mode is active Optionally the stereo signal from the computer can also be summed when Headphone Mono mode is engaged See DIP Switch Options Main Outputs Signal level at the balanced XLR outputs and unbalanced AUX outputs is adjusted with the Output Gain Control The signal source for the outputs is the output audio from the computer This sour
7. 00 Wengel Drive Reedsburg WI 53959 USA declares that the product USBPre 2 Portable Computer Audio Interface is in conformity with and passes EN55103 1 1997 EN55103 2 1997 EN55103 1 Phenomena 2 3 1997 EN55103 2 Phenomena 3 1997 EN61000 4 2 2001 IEC61000 4 2 2001 EN61000 4 3 2001 IEC1000 4 3 2001 EN61000 4 4 2001 IEC61000 4 4 2001 EN61000 4 4 2001 IEC61000 4 4 2001 EN61000 4 5 2001 IEC61000 4 5 2001 EN61000 4 6 2001 IEC61000 4 6 2001 IEC61000 4 11 2001 EMC product family standard for audio video audio visual and entertainment lighting control apparatus for professional use Part 1 Emissions EMC product family standard for audio video audio visual and entertainment lighting control apparatus for professional use Part 2 Immunity Magnetic emissions at 1 meter 50 Hz 50 kHz Magnetic immunity 50 Hz to 10 kHz ESD 4 kV contact 8 kV air discharge Radiated RF immunity 10 V m 80 1 kHz amplitude modula tion AC power ports EFT Burst I O lines 0 25 kV to 1 0 kV power line 0 5 KB 1 kV EFT Burst I O lines 0 25 kV to 1 0 kV power line 0 5 kB 1 kV Surge 1 kV differential mode line to line 2 KV common mode line to ground Conducted RF immunity 3 V 80 91 kHz amplitude modulation Voltage dips and short interruptions at test voltage level 0 V unominal 70 V unominal 25 period Tested by L S Compliance Inc Cedarbur
8. Metering Phantom Power Powering Dimensions unpackaged Weight Certifications Included Accessories USBPre 2 User Guide and Technical Information 10 Hz 40 kHz 0 5 dB 3 dB at 65 kHz any input to PC recording 10 Hz 40 kHz 0 5 dB 3 dB at 65 kHz PC source to AUX or XLR output 0 05 max any input to PC recording gain control at min input driven to 6 dBFS 0 009 max AUX output 0 dB V output 100k ohm load 0 05 max HEADPHONES output 2 V rms output 600 ohm load e 127 dBu min 22 Hz 22 kHz bandwidth 150 ohm source gain control fully clock wise 15 dB pad out Mic 10 dBu 0 25 V RMS Mic 15 dB pad 4 dBu 0 78 V RMS Mic 10 dBu min 60 dBu max Mic 15 dB pad 4 dBu min 45 dBu max Mic 4k ohm active balanced Mic 4 dBFS Mic 3 dB at 80 Hz 12 dB per octave e Balanced XLR 18 dBu with 100k ohm load Aux 8 dBu 2 0 V rms with 100k ohm load Balanced XLR Line level 500 ohms Balanced XLR Mic level 5 ohms 24 or 16 bit input Line 28 dBu 19 45 V rms Aux 9 dBu 2 18 V rms Line 29 dBu min 10 dBu max e Aux 12 dBu min 7 dBu max Line 60k ohm active balanced e Aux 80k ohm active balanced Headphones 11 dBu 2 75 V rms with 600 ohm load e Aux 660 ohms 24 bit resolution 114 dB typical dynamic range 22 Hz 22 kHz bandwidth A weight ed 24 bit resolution 112 dB typical dyn
9. Q Q L 5 gt D 2 See ow RE OO OO 0 42 OG B GO n us gt 2 5 5 5 55555 zZ Z aoe IT m rz A Setti 48 Volt Phantom Power 9 and 10 Up position engages 48 Volt phantom power on balanced microphone inputs Required for condenser microphones See Inputs Section Low Cut Filter 7 and 8 Up position engages low cut filter on balanced microphone inputs 3 dB at 80 Hz 12 dB per octave See Inputs Section Limiter 5 and 6 Up position engages limiters on balanced microphone inputs Attenuates signal above 4 dBFS See Inputs Section 15 dB Pad 3 and 4 Up position reduces gain by 15 dB on balanced microphone inputs Useful for sensitive mi crophones or very loud program material See Inputs Section Dual Mono 1 Up position disables input 2 and routes input 1 signal to both tracks This routing is pre gain so channel 1 Gain Control still affects the signal sent to the track SOUND DEVICES B Settings Balanced Output Level 1 and 2 Determines level of balanced XLR outputs Up position Line level 0 dBu Down position Mic level 40 dBu See Outputs and Monitoring HP Mono Function 3 Adjusts what signals are summed when HP MONO is active Up position Input signals only Down position Input signals and output audio from the computer See Ouputs and Moni toring Meter PRE PC 4 Adjusts whether or not the meter source switches automatically to PC metering when computer audio is present Up pos
10. amic range 22 Hz 22 kHz bandwidth A weight ed Mic 80 dB max Mic 15 dB pad 65 dB max Recording 8 16 or 24 bit at 8 16 32 44 1 48 96 or 192 kHz Crystal based low jitter e Line 30 dB max e Aux 13 dB max Playback 24 bit at 8 16 32 44 1 48 96 or 192 kHz 2 x 23 segments 44 dB total range peak ballistics 0 dB on meter 0 dBFS 0 dB referenced to full scale digital e 48 V through 6 8k ohm resistors Each mic input will supply 10 mA USB bus powered 5 V 10 500 mA max current from USB port USBPre 2 will not function if connected through a passive USB connection or hub e 4 3 cm x 18cm x 10 cm H x W x D e 0 5 kg e Meets FCC Part 15 Class B e USB Cable SOUND DEVICES e 1 7 in x 7 25 in x 4 25 in Hx W x D e 1 13 Ibs e Complies with the Requirements of European Directive 89 336 EEC e Rubber Feet USBPre 2 User Guide and Technical Information Warranty and Technical Support Warranty amp Service Sound Devices LLC warrants the USBPre 2 against defects in materials and workmanship for a period of ONE 1 year from date of original retail purchase This is a non transferable warranty that extends only to the original purchaser Sound Devices LLC will repair or replace the product at its discretion at no charge Warranty claims due to severe service conditions will be addressed on an in dividual basis THE WARRANTY AND REMEDIES SET FORTH ABOVE ARE EXCLUSIVE
11. anced XLR output Can be configured to adjust headphone gain See DIP Switch Options 13 Headphone Volume Control Big Knob Adjusts headphone gain Can be con figured to adjust XLR and AUX output levels See DIP Switch Options SOUND DEVICES USBPre 2 User Guide and Technical Information USBPre 2 User Guide and Technical Information Input and Output Panel Descriptions MIC 1 MIC2 UNEIN AUXIN 2 fix la 3 1 Mic Inputs 5 Active balanced XLR inputs accept low impedance microphone level signals 2 Line Inputs Accepts balanced line level signals 3 AUX Inputs Accepts consumer level inputs such as CD Players Camcorders Portable DVD Players and Mini jack from computers via RCA connectors 7 6 4 Headphone Outputs 3 5 mm and 14 inch TRS stereo heaphone outputs can drive low impedance head phones NOTE The USBPre can drive headphones to dangerously loud levels take caution when setting the headphone level Back Panel Descriptions AUX Output Audio output to feed powered loud speakers CD Recorders Camcorders or Portable DVD Recorders RCA connec tors Computer audio only S PDIF Coaxial Input and Output Coaxial digital input and output connec tors Input is selected via the front panel input selection switch USB Port USB B type connector for interconnec tion with the computer provides all data and power to the USBPre 2 via USB bus power
12. cations Utilities Audio MIDI Setup to open the Audio MIDI Setup dialog Le OO Audio MIDI Setup idio Devices MIDI Devices System Settings Default Input USBPre2 B Default Output x USBPre2 Fd System Output P USBPre2 H4 Properties For l USBPre2 He 7 Clock Source Default Configure speakers Audio Input Audio Output Master Strear Master Strean Source Default Source Default Format 48000 0Hz r 2ch 24bit F Format 48000 0Hz 2ch 24bir 4 Ch Volume Value dB Mute Thru Ch Volume Value dB Mute M M O 1 1 Q 2 gt 2 Ensure that the USBPre 2 is selected for both the Default Input dropdown menu and the Default Out put dropdown menu in the System Settings section Adjusting Sample Rate in OS X 1 Follow Applications Utilities Audio MIDI Setup to open the Audio MIDI Setup dialog O OLO Audio MIDI Setup idio Devices MIDI Devices system Settings Default Input ef USBPre2 H4 Default Output Y USBPre2 Ke System Output USBPre2 Properties For USBPre2 Ke A Clock Source Default Configure Speakers Audio Input Audio Output fes M er Strean Master Strear Source Default r Source Default Format 48000 0 Hz 2ch 24bit H Format 48000 0 Hz 2ch 24b
13. ce can be changed to the same source as the headphone output with the back panel DIP Switches The balanced XLR outputs are set to line level by default and can be set to mic level with the back panel DIP switches See DIP Switch Options The Windows Volume Control controlled with the speaker icon in the system tray and the Mac volume control affect the level of the computer s output audio before it reaches the USBPre It is gener ally best practice to set the volume control to 100 and make adjustments to the output level with the USBPre 2 s Output Gain Control Digital Outputs When the USBPre 2 is used as a computer audio interface the sample rate of the digital outputs Coaxial S PDIF and optical TOSLINK is determined by the application settings on the computer In Stand alone mode the sample rate is determined by the position of the back panel DIP switches Optical TOSLINK outputs are inoperable at 192 kHz sample rate Metering The USBPre 2 features a 23 segment 2 channel LED meter The meter displays both the peak level of source audio and average VU levels simultaneously 0 dB on the meter is calibrated to 0 dBFS signal coming from the computer The current source signal for the meter is indicated by an illuminated LED next the Meter Source Button The meter source can be toggled by pushing the Meter Source Button When the meter a Features and specifications are subject to change Visit www sounddevices com for the lat
14. ce mode except that the Meter Source button is disabled and the meter mode is locked to PRE Since there is no reference clock from the computer the operating sample rate is set using the back panel DIP Switches See DIP Switch Options Sample Rate In Stand alone mode the sample clock is generated by the USBPre 2 s internal sample clock genera tor and the Sample rate is set by adjusting the DIP switches on the back panel of the USBPre 2 See DIP Switch Options This will affect the internal sample rate of the USBPre 2 as well as the sample rate output from the digital outputs Sample rates below 32 kHz are not supported on the coaxial or optical TOSLINK digital interconnec tions 192 kHz sampling rate is not supported on the TOSLINK interconnections In Interface mode the USBPre 2 operates at the sample rate set from the host operating system and the DIP switches related to sample rate are ignored It is further possible to change the sampling rate of the USBPre 2 within some applications audio preferences In Windows XP there is no global sample setting and the sample rate must be set by the application in use Locking Sample Rate to External Sources The sample rate of the USBPre 2 can be locked to the sample rate of an external S PDIF signal When a digital signal is connected to either the coaxial or optical input the S PDIF Input Source LED will illuminate to indicate that the USBPre 2 is locked to the sample rate of the incomi
15. dware Sound playback Default device Hy z USBPrez Volume Advanced Sound recording A Default device LISBPre2 Volume Advanced MIDI music playback mas Default device amu Microsoft GS Wavetable SW Synth Volume About Use only default devices Inputs Input Source Selection The USBPre 2 has two available input channels The source for each input is independently selected using the Input Select Buttons on the front panel The selected source is indicated by an illuminated LED next to the respective Input Select Button The Input Select Buttons can be locked to prevent ac cidental switching of the input sources See DIP Switch Options Microphone Inputs Phantom Power The USBPre 2 provides 48 volt phantom power for condenser microphones connected to the XLR inputs Phantom power can be engaged independently for each input See DIP Switch Options Con denser microphones that can operate on phantom voltages from 11 52 volts will function properly with 48 volt phantom Dynamic microphones typically do not require phantom power A properly connected balanced dynamic microphone is not affected by the presence of phantom power nor will it draw any current However it is good practice to turn phantom power off when not needed Poor or incorrectly wired microphone cable can cause audible artifacts in microphone signals Some wireless receivers outputs a
16. est documentation USBPre 2 User Guide and Technical Information source is set to PC the meter displays the audio level for signal coming from the computer In this mode the top row of the meter displays the left channel level and the bottom row displays the right channel level When the meter source is set to PRE the meter displays the audio level for signal at the active inputs In this mode the top row of the meter displays the level for the selected input source on channel one and the bottom row displays the level for the selected input source on channel 2 The meter source switches from PRE to PC automatically when signal is output from the computer This behavior can be defeated so that the source is switched manually See DIP Switch Options Stand Alone Mode In Stand Alone mode the USBPre 2 operates as a microphone preamplifier with both digital and analog outputs It can also accept digital signals and output analog audio The USBPre 2 will auto matically enter stand alone mode when connected to a USB jack supplying USB power 5V 500 mA max but is not associated with a running operating system For example a powered USB hub that is not attached to a computer The USBPre 2 can be forced into Stand alone mode when connected to a computer supplying USB power by holding down the Meter Source button when attaching the USB cable In Stand Alone mode all front panel controls perform the same functions as when the USBPre 2 is in Interfa
17. g Wisconsin July 14 2010 pl eM Matthew Anderson Director of Engineering Sound Devices LLC SOUND DEVICES SOUNDS DEVICES
18. ical Information Input 1 set to Mic XLR gt 1 Input 2 set to Line 1 4 TRS 2 6 If the PRE Meter Source LED is not illuminated press the Meter Source button to change the meter source to display input levels 7 For analog input sources adjust the Input Gain Control corresponding to the input being recorded Input Gain Controls do not affect digital input levels The meters will show the audio level of the input 8 Launch an audio application on the computer Make certain that the USBPre 2 is selected as the input and output device in the application s preferences Consult the applications documentation for further information LE Features and specifications are subject to change Visit www sounddevices com for the latest documentation Front Panel Descriptions el L t r 1 2 3 4 5 6 7 8 ETEA 48V PH O Input Gain SM Adjusts input gain Gain is minimized not turned off at full counter clockwise setting Gain control only affects analog input sources Low Cut LED Illuminates when low cut filter is engaged on either mic input See DIP Switch Options 15 dB pad LED Illuminates when 15 dB pad is engaged on either mic input See DIP Switch Op Hons 48V Phantom Power LED Illuminates when phantom power is engaged on either mic input See DIP Switch Options Input 1 Split LED Illuminates when Input 1 Split is active See DIP Switch Option
19. ing USB 1 1 and 2 0 compli ant 1 Balanced XLR Outputs 3 Active balanced analog outputs Mic Line switchable See DIP Switch Options 2 S PDIF Optical Input and Output Optical digital TOSLINK input and output connectors DIP Switches DIP Switches to configure various as pects of the USBPre 2 6 Features and specifications are subject to change Visit www sounddevices com for the latest documentation DIP Switch Options USBPre 2 User Guide and Technical Information The DIP switches on the back panel of the USBPre 2 can control various features To adjust an indi vidual switch carefully move the switch with a slender tool In the following descriptions Up refers to the direction ot the USBPre 2 s top panel A SETTINGS B SETTINGS 2 ows z 2 7 gz amp Q t H ROSS O 0 O O O 6 O O Oo 5 5 zo i o o Mondial I I I I I I I I I I I I T I I I r 1 34 109 8 7 6 5 4 3 2 1 1 2 3 4 5 6 7 8 9 10 I I l I I I I l I k G I I u I l I i bob bh bt E gp wu H 3 2 4 4 4 48K 6 6 6 6 6 6 6 6 O E 2 2 jiz OO j j z t t 192K T M t i t LEE Q a I az 4 88 2K D D o a O O m5 amp E Q 5 Q 4 t 1 44 1K I E m r5 2 Z O 5 t 32k amp amp 5 S SE588 4 amp 9 az O O t 16K n oux cl aa KF wo zh a 4 8K i l i i i i 0002 E e Ee Ow Zx N Q
20. it Ch Volume Value dB Mute Thru Ch Volume Value dB Mute M M 1 0 1 O 2 0 8 Features and specifications are subject to change Visit www sounddevices com for the latest documentation USBPre 2 User Guide and Technical Information 2 Select the USBPre 2 from the Properties For dropdown menu then set the sample rate channel count and bit depth as desired from the dropdown menus in the Audio Input section and the Audio Output section Windows Installation and Connection The USBPre 2 is an Audio Device Class USB standard peripheral No proprietary drivers are re quired to operate the USBPre 2 under Windows The first time the USBPre 2 is plugged in Windows will install standard USB Audio Device Class drivers automatically Before connecting the USBPre 2 quit all open applications that use audio An application that is running when the USBPre 2 is connected may not recognize the USBPre 2 until the application is restarted Windows 7 and Vista Sound Control Panel 1 Follow Start Control Panel Sound Speakers High Definition Audio Device Ready Digital Audio S PDIF High Definition Audio Device Ready Speakers USBPre2 v Default Device 2 Click the Playback tab 3 Click to select the item labeled USBPre2 in the list of devices 4 Clickthe Set Default button A green check mark icon will appear next the the USBPre 2 entry and the phrase Default Device will appear below the entry i
21. ition Auto matic Down position Manual See Ouputs and Monitoring HP Output Knob 5 Adjusts which knob controls headphone gain and which knob controls main output gain Up position Big Knob controls headphone gain and Small Knob controls main output gain Down position Big Knob controls main output gain and Small Knob controls headphone gain Headphone Signal to Outputs 6 Up position Only computer audio is sent to outputs Down position Main analog output source is the same as headphone signal source and affected by Monitor Mix Control Note In Stand alone mode input signal is always routed to the outputs and this setting has no effect Input Select Lock 7 Up position Input Select Buttons function nor mally Down position Input Select Buttons are disabled and input source selection is locked Stand Alone Sample Rate 8 9 and 10 Sets the operating sample rate when in Stand Alone mode according to the associated diagram See Stand Alone mode In Soundcard Mode sample rate is determined by the com puter See Installation and Connection USBPre 2 User Guide and Technical Information Mac OS Installation and Connection Before connecting the USBPre 2 quit all open applications that use audio An application that is running when the USBPre 2 is connected may not recognize the USBPre 2 until the application is restarted Screen shots show Mac OS 10 5 OS X Audio MIDI Setup 1 Follow Appli
22. metimes referred to as Professional line level Wiring is tip signal ring signal and sleeve ground Aux Inputs The Aux Inputs use unbalanced RCA connectors and accept 10 dBu analog signal sometimes referred to as Consumer line level This input is designed for signal from CD players camcorders portable DVD players and other similar devices Signal output from turntables without built in phono preamplifiers is too weak for the USBPre 2 s Aux Inputs A separate phono preamplifier may be required depending on the design of the turntable Digital Inputs Digital signal in the S PDIF format can be input to either the coaxial RCA connector or the optical TOSLINK connector If signal is present at both the optical and coaxial input the signal from the optical input takes precedence Sample rates below 32 kHz are not supported on the digital connections The optical connections do not support the 192 kHz sampling rate Input 2 Loop Source Input 2 has an additional source labeled LOOP This input source does not correspond to any physi cal connections on the USBPre 2 When LOOP is selected input 2 s source is derived from the left channel of the computer audio signal The input 2 Gain Control affects signal The Output Gain Con trol does not affect the level of the signal going in to input 2 The LOOP source is useful for test and measurement applications where a reference signal is re quired to be routed back
23. ndicating that the USBPre 2 is now the default playback device 5 Click the Recording tab and repeat and repeat steps 3 and 4 to make the USBPre 2 the default recording device SOUND DEVICES USBPre 2 User Guide and Technical Information Adjusting Sample Rate in Windows 7 and Vista 1 Follow Start Control Panel Sound 2 Click the Playback tab Highlight Single click the entry labeled USBPre2 and then Click the Proper ties button Speakers High Definition Audio Device Ready Digital Audio 5 PDIF High Definition Audio Device Ready Speakers USBPrez Default Device Default Format Select the sample rate and bit depth to be used when running in shared mode Exclusive Mode Allow applications to take exclusive contral of this device Give exclusive mode applications priority Restore Defaults ao Features and specifications are subject to change Visit www sounddevices com for the latest documentation USBPre 2 User Guide and Technical Information Windows XP Sound Control Panel 1 Follow Start Control Panel The control panel view will be be in either Classic view or Category view 2 If category view is enabled click Sounds Speech and Audio Devices then click Sounds and Audio De vices Skip to step number 4 E Control Panel File Edit View Favorites Tools Help Back v T T a Search Folders m Address J control Panel Ja Control Panel G Switch En Clas
24. ng digital signal The S PDIF Input Source LED s will flash for 30 seconds when the signal is removed or turned off To make a digital recording with the computer at a locked sample rate be certain that the incoming digital signal is valid solid S PDIF Input Source LED s and that the software driver is set to the SOUNDSDEVICES m USBPre 2 User Guide and Technical Information same sample rate as that of the incoming digital signal See Installation and Connection section for your operating system If the USBPre 2 senses a discrepency in the incoming digital signal such as a clocking error the Meter Source LED will flash until the Meter Source button is pushed Setup Examples Test and Measurement The high quality preamplifiers and portability of the USBPre 2 make it a perfect interface for test and measurement applications A requirement for measuring a transfer function is the ability to moni tor the output reference signal from the computer The LOOP source of input 2 enables a copy of the computer audio left channel to be internally routed to input 2 This allows reference signal to be sent back into the measurement application without additional cabling The USBPre 2 supports native sample rates below 44 1 kHz to provide better FFT resolution for low frequency audio measurements I Features and specifications are subject to change Visit www sounddevices com for the latest documentation USBPre
25. re adversely affected by the presence of phantom power therefore consult the wireless receiver documentation Low Cut Filter The low cut filter attenuates low frequency signals This is useful in conditions where low frequency signal is causing overload before the desired gain is reached windy environments or handheld mi crophones for example 12 Features and specifications are subject to change Visit www sounddevices com for the latest documentation USBPre 2 User Guide and Technical Information Input Pad With some combinations of microphone sensitivity and sound pressure levels the microphone input of the USBPre 2 can become overloaded even when the input gain is at its lowest level A 15 dB pad can be engaged on the microphone input to reduce its sensitivity See DIP Switch Options Input Limiters In environments where high sound pressure levels may occur unexpectedly input limiting prevents distortion by attenuating signals that surpass the input threshold level In normal operation with properly set input levels the threshold of an input limiter is rarely reached Signals below the thresh old are not affected by the limiter Limiters can be engaged on each microphone input independently See DIP Switch Options The amber LIM LED s on the right side of the meters will illuminate to indi cate when limiting is occurring Line Inputs The Line Inputs use balanced quarter inch connectors and accept 4 dBu analog signal so
26. s Input Select Buttons and Input Source LEDs Selects between the available input types Input Source LED to the right will illuminate to indicate which source is currently active Meter 23 segment LED meter Calibrated in dBFS with peak VU ballistics Meter Source Button Switches meter source between input or output signal LED illuminates to indi cate current selection 2 3 8 10 12 PEAR ae nx es PRE lo PC HP MONO J Ne uc S Mono a LED Toggles between mono and stereo moni toring of analog input audio in head phones especially useful when multi track recording and recording from one input LED illuminates when Mono is active This function can be configured to affect PC Audio as well See DIP Switch Options Limiter LEDs Illuminates amber when limiting is oc curing 10 Ner 11 Monitor Mix Control Selects the signal source to be monitored in the headphones between analog source audio PRE and computer audio PC Listening to PRE audio allows zero latency monitoring of analog input sources The center position mixes monitoring of both source and computer audio The signal at the AUX Output and balanced XLR Output is unaffected by this control NOTE S PDIF digital in puts cannot be monitored in the headphones S PDIF signal can only be monitored after being processed by the computer 12 Output Gain Control Small Knob Adjusts gain of AUX Output and bal
27. sic view Pick a category at I Y X Printers and Other e Appearance and Themes Hardware See Also x i E Windows Update Help and Support E Internet User Accounts o Other Control Panel Options Te hes Add or Remove Programs E Date Time Language and thts Regional Options Sounds Speech and Audio Devices Accessibility Options Performance and Maintenance Security Center OF eRe 3 If classic view is enabled click Sounds and Audio Devices F Control Panel yg Inf xi File Edit View Favorites Tools Help Back T m po Search Folders Eile Address Q Control Panel a N al Ji Control Panel Ca Lal TH gt e Same Intel R GMA Internet Keyboard Mouse G Switch to Category View Controllers Driver For Options See Also x Network Phone and Power Options Printers and QuickTime 9 Windows Update Connections Modem Faxes Help and Support o SF 3 Regional and Scanners and Scheduled Security SigmaTel Language Cameras Tasks Center Audio Sounds and Speech Startup Disk Symantec System Audio Devices LiveUpdate SOUND DEVICES USBPre 2 User Guide and Technical Information 4 Click the Audio tab Select the USBPre 2 from the Default device dropdown menu in the Sound play back section Select the USBPre 2 from the Default device dropdown menu in the Sound recording section Volume Sounds Audio Voice Har
28. spins down hard disks shuts down displays or a combination of the above to reduce current consumption and extend battery run time The change in state from active to power saving mode can disrupt data on the USB bus and cause unintended dropouts Sound Devices cannot guarantee that a given computer can be used satisfactorily with the USBPre 2 based exclusively on the fact that it meets the above requirements E Features and specifications are subject to change Visit www sounddevices com for the latest documentation USBPre 2 User Guide and Technical Information Quick Start Guide Sound Card Connection 1 Attach the A plug of the supplied USB cable into an available A socket on the computer Attach the B plug of the USB cable into the B socket on the USBPre 2 The USBPre 2 s meter LED s will il luminate sequentially indicating the USBPre 2 is connected and booting up properly 2 Check to see that the operating system has recognized the USBPre 2 and designated the USBPre 2 as the default sound card See Installation and Connection 3 Connect an audio source See Inputs 4 Powered Monitors Powered monitors with balanced analog inputs can also be attached to the XLR outputs on the back panel of the USBPre 2 5 Press the Input Select button repeatedly until the proper Input Source LED is illuminated for the input you will be recording SOUNDSDEVICES ES USBPre 2 User Guide and Techn
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