LLC. SOUND DEVICES is 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 modifi cations, repairs, or alterations to this product, or failure to strictly comply with SOUND DEVICES, LLC’s operating and installation instructions.
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.
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Input Gain Controls do not affect digital input levels. The meters will show the audio level of the input. 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 v.
USBPre 2 User Guide and Technical Information Front Panel Descriptions Input Gain Controls Headphone Mono Button and LED Adjusts input gain. Gain is minimized Toggles between mono and stereo (not turned off) at full counter-clockwise monitoring of analog input audio in setting.
USB B-type connector for interconnec- Headphone Outputs tion with the computer; provides all 3.5 mm and ¼-inch TRS stereo heaphone data and power to the USBPre 2 via USB outputs can drive low-impedance head- bus powering. USB 1.1 and 2.0 compli- phones.
USBPre 2 User Guide and Technical Information DIP Switch Options The DIP switches on the back panel of the USBPre 2 can be switched to select various parameters. To adjust an individual switch, carefully move the switch with a slender tool.
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. OS X Audio / MIDI Setup Follow Applications>...
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 fi rst time the USBPre 2 is plugged in, Windows will install standard USB Audio Device Class drivers automatically.
USBPre 2 User Guide and Technical Information Adjusting Sample Rate in Windows 7 and Vista Follow Start> Control Panel> Sound. Click the Playback tab. Highlight (Single click) the entry labeled “USBPre2” and then Click the Proper- ties button. Click the Advanced tab.
USBPre 2 User Guide and Technical Information Windows XP Sound Control Panel Follow Start> Control Panel. The control panel view will be be in either “Classic view” or “Category view”. Category view. If this view is visible, click Sounds, Speech, and Audio Devices, then click Sounds and Audio Devices.
USBPre 2 User Guide and Technical Information 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.
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 senitivity.
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 the peak level of source audio. 0 dB on the meter is calibrated to 0 dB FS signal coming from the computer.
USB jack that supplies USB power (5V, 500 mA max) but is not associated with a running operat- ing system (For example, a powered USB hub that is not attached to a computer). The USBPre 2 can be forced into Stand-alone mode by holding down the Meter Source button when attaching the USB cable.
Setup Examples Test and Measurement The high quality preamplifi ers and portability of the USBPre 2 make it a perfect interface for test and measurement applications. A requirement for gathering a transfer function is the ability to monitor the output reference tone from the computer. The LOOP source of input 2 enables a copy of the com- puter audio left channel to be internally routed to input 2.
USBPre 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. Monitors LEFT RIGHT Power amplifier input...
USB bus powered, soft-start meets USB hot-plugging power requirements (5 V, 100 mA max current drawn during enumeration) • 5 V (+/- 10%, 500 mA max current from USB port (USBPre 2 will not function if connected through a passive USB connection or hub) Dimensions (unpackaged) •...
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.
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