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Sound Devices usbpre, User Manual

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Sound Devices usbpre User Manual Download Page 16

User Guide and

Technical Information

page 16

SOUND DEVICES, LLC

The USBPre communicates with the Mac OS and 
audio software through a USB Sound Manager 
driver. Software applications that communicate 
with Sound Manager can communicate with the 
USBPre for recording and playback.

Depending on the applications software, you may 
need to select the USBPre in the Sound control 
panel before launching audio software in order for 
it to be used as audio input and output hardware.

Note: Do not plug or unplug the USBPre when 

actively recording or playing through the USBPre. 
The application and the operating system may 
become unstable. Unplug the USBPre only after 
exiting out of audio application software.

Audio Playback

Depending on the configuration file loaded (see 
below), the USBPre may show up as built-in audio 
or as a separate USB audio output device When 
connected to the computer the USBPre can take 

over playback of audio, disabling internal audio 

1.     Input Selection

Selects the input type of each channel. If a 
S/PDIF version of USBPre is connected, S/
PDIF shows up as an available input type.

2.     Phantom Power

Applies 48-volt phantom power to both micro-
phone inputs.

3.     Headphone Monitor

Selects between mono and stereo headphone 
monitoring of analog audio sources. PC audio 
remains in stereo.

4.     Device Information

Shows the name of the attached USBPre,  
the sample rates under Sound Manager, 
and whether it is in Sound Manager or ASIO 
mode.

5.     Record Sample Rate

Indicates the selected record sample rate. 

See “Configure the USBPre” to change record 
sample rates.

6.     S/PDIF Playback Sample Rate

If an S/PDIF unit is connected, the control 
panel will indicate the sample rate of S/PDIF 
audio played out of the S/PDIF connection.

7.     Help

Launches the HTML-based help file.

8.     Button Lock

When selected, button lock prevents the func-
tion selection on the USBPre hardware from 
being active, preventing unintended changes 
to the function.

9.     Configure Button

When in the configuration mode, this allows 
record sample rates to be changed in Sound 
Manager (see Configuration Mode).

USBPre Mac OS Control Panel

The USBPre control panel application duplicates 
the selections of the front panel of the USBPre 
hardware. The control panel also serves as the 
utility to load configuration files onto the USBPre. 

Configuration files are required to change record 
sample rates. The USBPre control panel is 
installed into the Control Panels folder of the 
System Folder.

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Selecting the USBPre

Summary of Contents for usbpre

Page 1: ... Hardware Microsoft Windows Driver v 2 5 with ASIO 2 09 Macintosh OS 9 X Driver v 2 0 with ASIO 2 09 Sound Devices LLC 300 Wengel Drive Reedsburg WI 53959 USA Telephone 608 524 0625 Fax 608 524 0655 support sounddevices com www sounddevices com ...

Page 2: ... Naming USBPre Hardware 13 ASIO ASIO Installation Only 14 ASIO Control Panel 14 Software Installation 15 Macintosh OS Operation 15 Connecting Hardware 15 Selecting the USBPre 16 USBPre Mac OS Control Panel 16 S PDIF Input and Output 18 Mac OS ASIO Installation 19 Recording with the USBPre 20 Input Source Selection 20 Input Pad 20 Sample Rates 20 S PDIF Inputs 20 Metering 20 Phantom Power 20 Headph...

Page 3: ...reproduced stored in a retrieval system or trans mitted in any form or by any means electronic mechanical photocopying recording or otherwise with out the written permission of SOUND DEVICES LLC The information contained herein is designed only for use with this USBPre audio interface SOUND DEVICES is not responsible for any use of this infor mation as applied to other audio products SOUND DEVICES...

Page 4: ...transfers from DAT or other digital medium S PDIF output coaxial to interface to exter nal digital recorders and playback systems Level Metering Six segment LED peak input meter for pre cise level control of analog input sources Calibrated in dB FS Audio Monitoring Mix control enables zero delay monitoring of analog source audio computer audio or a mix of both source and computer audio in headphon...

Page 5: ...ipping Levels 1 THD Windows Mixer Mac volume at max PC AUDIO 8 dBu 2 0 V rms w 100k ohm load HEADPHONES 11 dBu 2 75 V rms w 600 ohm load Output Impedance PC AUDIO 3 3k ohms HEADPHONES 20 ohms S PDIF Digital 24 bit maximum input 20 bit maximum hardware output limited to 16 bit output in Windows Me and Mac Sound Manager sample rate and bit depth selected by record ing software and operating system A...

Page 6: ... your soft ware application s documentation Operating System Windows 98 Second Edition Windows 2000 SR 1 Windows Me Windows XP Home and Professional Processor Intel Pentium II 300 MHz or Intel Celeron 450 MHz minimum Cyrix processors not recommended RAM System Bus Speed 64 MB 128 MB with most software 66 MHz 100 MHz recommended Hard Drive 5400 rpm 7200 rpm mechanism recommended Sound Card None req...

Page 7: ... 66 MHz 100 MHz recommended Hard Drive 5400 rpm recommended 7200 rpm beneficial for recommended for multi track recording Sound Card None required Audio Software Sound Manager compatible audio software ASIO Compatible audio software for use with ASIO drivers For PowerBook and iBook users For proper operation of the USBPre turn off all power management when using the USBPre for audio recording Powe...

Page 8: ... level of each channel analog inputs only 5 Power LED Illuminates when USBPre is connected to a computer and receiving power over the USB port 6 MONO Monitoring Switch Toggles between mono and stereo monitoring of analog input audio in the headphones only especially useful when multi track recording and recording from one input Red LED illu minates when MONO is selected Audio from the PC is unaffe...

Page 9: ...n drive low impedance head phones Note The USBPre can drive headphones to dangerously loud levels take caution when raising the headphone level 13 PC Audio Output Audio output to feed powered loudspeakers or consumer level DAT MiniDisc and CD record ers RCA connectors Computer audio only The Volume level from this connection is con trolled only by the PC and its software 14 S PDIF Input and Output...

Page 10: ...tion To install the software for the USBPre 1 Power on your computer and start Microsoft Windows 98SE ME 2000 or XP 2 Close all open applications 3 Place the Sound Devices USBPre CD ROM in your CD ROM drive 4 Run the application D setup exe where D is the letter of your CD drive If you computer is set to auto launch a CD ROM the setup application will start automatically Note The setup application...

Page 11: ...USBPre communicates with the Windows operating system and audio software through Windows USB audio drivers Software applications that communicate with Windows wave or direct sound audio can access the USBPre for record ing and playback The USBPre functions as a very powerful outboard sound card and replaces the on board sound cards functionality With most computer systems the USBPre becomes the de...

Page 12: ...ghlighted and the hardware can be renamed This name will be applied to the hardware and will show up in the Device Selection field in software applications that can select between audio hardware 5 Headphone Monitor Selects between mono and stereo headphone monitoring of analog audio sources 6 S PDIF Output Sync When a frequency is selected the S PDIF ouput clock remains active at the selected fre ...

Page 13: ...nd Windows 2000 a full 24 bit signal will be trans ferred In Windows Me signals with bit depths high er than 16 bit will be truncated to 16 bit The input selection LED flashes without S PDIF connection and turns solid when a valid S PDIF source is con nected Output In Windows 98SE and 2000 the output of the USBPre is limited to 16 bit with wave audio using the ASIO drivers enables a maximum output...

Page 14: ...ring check box in two situations 1 The ASIO recording resolution is set higher than the application recording resolution 2 The appli cation output resolution is higher than the ASIO output resolution 7 System Performance This controls the speed at which the recorded signal is set The ASIO control panel supports Highspeed Fast Normal and Relaxed If you system has noticible clicks decrease the sys t...

Page 15: ...onnecting Hardware Make certain to quit any open audio applications before connecting the USBPre If not the USBPre will not be available for use as audio I O There is no on or off switch on the USBPre Plugging and unplugging the USBPre is its equivalent When the hardware is connected the input selec tion LEDs will scroll showing that the USBPre is connecting with its driver software If the LEDs do...

Page 16: ...wer to both micro phone inputs 3 Headphone Monitor Selects between mono and stereo headphone monitoring of analog audio sources PC audio remains in stereo 4 Device Information Shows the name of the attached USBPre the sample rates under Sound Manager and whether it is in Sound Manager or ASIO mode 5 Record Sample Rate Indicates the selected record sample rate See Configure the USBPre to change rec...

Page 17: ...n settings is available in the Configurations folder in the Sound Devices USBPre folder Select from the following Configurations There are three variables to the USBPre s Macintosh configuration files The syntax of the file names is as follows Input Types There are two different input types Mic In and Sound In Both types function identically in most applications The difference is the selection in ...

Page 18: ...u may want to change this output sample rate to transfer 32 kHz or 48 kHz files at their respective rates Sound Control Panel where the USB audio device USBPre will show up as either a Mic source or a Sound In source The one advantage of a Sound In configuration type is that the selection Play Through Hardware is available in the Sound Manager Control Panel Playing through hardware is not availabl...

Page 19: ...move the USBPre ASIO file to the ASIO Driver folder of the audio software applications The USBPre is now available as an ASIO device for ASIO compatible software Verify that the USBPre is an ASIO device by opening the USBPre control panel When the USBPre is enabled as an ASIO device the USBPre does not show up in Sound Manager The USBPre can be either an ASIO device or a Sound Manager device under...

Page 20: ...d Mac OS without ASIO any source with bit depths greater than 16 bit will be truncated to 16 bit In Windows the sample rate of the source mate rial into the S PDIF input must match the sample rate selected in recording software otherwise a rate mismatch will occur and distortion will cause an unusable signal In Mac OS the sample rate of source material must match the sample rate selected in the co...

Page 21: ...AM With too small of a buffer audio hardware runs out of audio data before it can be read from the hard drive Typically larger buffer sizes improve stability of audio applications at the expense of program responsiveness Refer to you software documentation for guidance in adjusting buffer sizes Power Management Power conservation is a significant issue for note book computer designers and is becom...

Page 22: ...ation of stand alone products a stereo micro phone preamplifier A D converter S PDIF format converter D A converter and headphone amplifier in a single box The convenience of having all of these components in a single compact product powered from the computer is obvious The block diagram below shows one analog input of the USBPre USBPre Architecture Overview ...

Page 23: ...not been loaded on the computer Disconnect the USBPre and install the soft ware from the included CD ROM Also check that you are running on a system that meets the minimum requirements If the computer has successfully connected to the USBPre in the past disconnect the hardware wait several seconds and recon nect This will reconnect the USBPre with the operating system 5 I can t get the USBPre to s...

Page 24: ...lect the CD Music tab and check the Enable digital CD audio to play audio through the USBPre In Windows 2000 go to Start Settings Control Panel Sounds and Multimedia and select the Hardware tab Select the CD ROM and then click on the Properties button then select the Properties tab and check the Enable digital CD audio In Mac OS select USB Audio as the output type in the Sound Control Panel 12 Whe...

Page 25: ...ce including warranty repair please send the USBPre along with proof of purchase date to Sound Devices LLC Service Repair 300 Wengel Drive Reedsburg WI 53959 USA telephone 608 524 0625 FCC Statement This device has been tested and found to comply with the limits for a class B digital device pursu ant to part 15 of the FCC rules These limits are designed to provide reasonable protection against har...

Page 26: ...y physically transfer the SOFTWARE from one computer to another provided that the SOFTWARE is used on only one computer at any one time Licensee may not electronically transfer the SOFTWARE to multiple computers over a network sys tem Licensee may not distribute copies of the SOFTWARE or accompanying materials to others Licensee may not modify adapt translate reverse engineer decompile disassemble...

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