Sound Devices USBPre
USBPre 2 Portable
High-Resolution Audio Interface
Sound Devices USBPre 2 is a high-resolution, portable
hardware interface for Mac- and Windows-based digital audio. The
USBPre 2 is the industry's highest performance and most flexible
portable interface, connecting professional microphones, line-level
sources, consumer audio electronics, and S/PDIF digital sources
with Mac OS and Windows computers via USB.
|TA3-F to XLR-M 15"
USBPre 2 Front Panel
USBPre 2 Back Panel
Features of USBPre
Precision Microphone Preamplifiers
USBPre 2 includes two discrete-transistor microphone preamps with
24-bit converters and sampling rates up to 192 kHz. These
preamplifiers provide the highest performance in any portable
interface. Their topology is shared with Sound Devices
award-winning 744T Digital Audio Recorder. Peak limiters, high-pass
filters, and a 15 dB pad provide overload protection. All
analog-to-digital and digital-to-analog conversion is performed by
the USBPre 2 for superior audio performance
USBPre 2 Left
USBPre 2 Right Panel
USBPre 2 is a class-compliant audio device. This allows for simple
plug-and-play connection to computers running Mac OS, Windows, and
Linux (see note to the right on Class-Compliant Drivers). There are
no drivers to install for the USBPre 2 and there are no
software-only features. All additional controls and settings are
available on back panel DIP switches. The USB port also provides
power to the unit, both when connected as an audio interface and
when used in Stand-Alone operation.
To interconnect with sound systems big and small, the USBPre 2
includes numerous output connection types, including balanced mic-
or line-level on XLR, unbalanced consumer line-level on RCA, S/PDIF
coaxial (RCA) and optical (Toslink). The outputs have their own,
dedicated front-panel level control. Use the balanced line-level
signals to connect to powered loudspeakers. Use the optical S/PDIF
to connect to hi-fi systems. Use the coaxial S/PDIF output in
Stand-Alone mode for a portable microphone preamplifer with digital
output for any production application.
Accurate signal level metering is essential for any sound engineer.
The USBPre 2 includes a 23-segment, multicolor LED meter for
precise level indication. The meter is switchable between input
signal metering and playback signal metering. The meter indicates
both VU and peak (PPM) ballistics.
The USBPre 2 can be used in Stand-Alone mode where it operates as a
high-quality, portable microphone preamplifier and
analog-to-digital converter. Digital signals connected to the
USBPre 2 are converted to analog and available at the headphone,
XLR, and RCA outputs. Stand-Alone operation requires the unit to be
connected to a USB power source. Stand-Alone mode is a great option
when an additional microphone preamplifer, A-D converter, or D-A
converter is required.
Like all of Sound Devices products, the USBPre 2 is designed to
stand up to the most demanding environments. Its extruded aluminum
chassis and aluminum panels, machined knobs, metal connectors, and
laser-etched nomenclature are designed to hold up to years of
As a class-compliant audio device, the USBPre 2 is limited to a
maximum data rate of 24-bit, 48 kHz in Windows, Linux, and Mac OS
versions 10.4 to 10.5.7. Mac OS 10.5.8 and higher support the audio
class 2.0 device and can address the USBPre 2 up to 24-bit, 192
Key Features of USBPre
Extended bandwidth, low-noise microphone preamplifiers with 48 V
phantom, limiters, high-pass filters, and 15 dB pad.
• Dynamic range greater than 114 dB (in 24-bit
• Flat 10 Hz to 40 kHz (@96 kHz SR) audio bandwidth
with very low distortion characteristics.
• Each input individually selectable between
microphone, line, and aux level signals (both channels selected
simultaneously for S/PDIF connections).
• Precision, 23-segment, multicolor LED peak/VU meter,
selectable between input and output sources.
• High-output headphone amplifier can drive a wide
range of headphones.
• Balanced outputs on XLR connectors with dedicated
level control can be used to drive line- or mic-level inputs.
• Mix control enables zero-delay monitoring of source
audio, computer audio, or a mix of both source and computer audio
for multitrack recording or computer telephony.
• Phono (RCA) jacks connect Aux Output to external
loudspeakers or preamplifiers.
• Bus powering via USB for convenient, single-cable
connection to the computer.
• In Stand-Alone mode the USBPre 2 operates as a
microphone preamplifier and analog-to-digital converter.
• Hardware loop-through for test & measurement to
send computer audio directly back to an input.
• High-strength extruded aluminum chassis.
• Mac® OS X 10.4+, Windows®XP/Vista/7, and
Linux, class-compliant audio device.
• Additional features controlled by hardware DIP
switches on the back panel; no software-only features and no
Frequency Response (reference 1 kHz, at 96 kHz
10 Hz - 40 kHz, ± 0.5 dB (any input to PC recording)
10 Hz - 40 kHz, ± 0.5 dB (PC source to AUX output)
THD+N (22 Hz
- 22 kHz measurement bandwidth)
0.05% max (any input to PC recording, gain control at min, input
driven to -6 dB FS)
0.009% max (AUX output, 0 dB V output, 100 ohm load)
0.05% max (HEADPHONES output, 2 V rms output, 600 ohm load)
-127 dBu min (22 Hz - 22 kHz bandwidth, 150 ohm source, gain
fully clockwise, 15 dB pad out)
Clipping Level (1% THD)
Mic: -10 dBu
Mic (15 dB pad): +4 dBu
Line: +28 dBu (19.45 V rms)
Aux: +9 dBu (2.18 V rms)
Sensitivity (typical, for 0 dB FS)
Mic: -9 dBu min, -60 dBu max
Mic (15 dB pad): +6 dBu min, -58 dBu max
Line: +29 dBu min, +10 dBu max
Aux: +12 dBu min, -7 dBu max.
Mic: 4k ohm, active-balanced
Mic (15 dB pad): 4k ohm, active-balanced
Line: 60k ohm, active-balanced
Aux: 80k ohm, active-balanced
Mic: -4 dBFS
Mic: 80 Hz, -3 dB, 12 dB per octave
Clipping Level (1% THD, PC-controlled output levels at
Balanced XLR: +18 dBu with 100k ohm load
Aux: +8 dBu (2.0 V rms) with 100k ohm load
Headphones: +11 dBu (2.75 V rms) with 600 ohm load
Headphone (Actual): 22 ohms
Balanced XLR (Line level): 500 ohms
Balanced XLR (Mic level): 5 ohms
Aux: 2k ohms
24 or 16 bit input
24-bit resolution. 114 dB typical dynamic range (22 Hz - 22 kHz
24-bit resolution. 112 dB typical dynamic range (22 Hz - 22 kHz
/ Bit Depths
Recording: 8, 16, or 24-bit at 8, 16, 32, 44.1, 48, 96, or 192
Playback: 24-bit at 8, 16, 32, 44.1, 48, 96, or 192 kHz
Crystal based, low jitter
48 segments, 44 dB total range, peak ballistics. 0 dB on meter = 0
dB FS (0 dB referenced to full scale digital)
48 V through 6.8k ohm resistors. Each mic input will supply 10
USB bus powered, soft-start meets USB hot-plugging power
requirements (5 V, 100 mA max current drawn during enumeration)
5 V, 500 mA max current from USB port (USBPre 2 will not function
if connected through a passive USB connection or hub)
4.3 cm x 18 cm x 10 cm (H x W x D)
1.7 in. x 7.25 in. x 4.25 in. (H x W x D)
Meets FCC Part 15 Class B
Complies with the Requirements of European Directive