International Shipping Level 1, USD20
The USBPre is the ideal tool for an investigator or installer to turn a standard laptop into a stand-alone digital recorder. The USBPre can use standard off the shelf microphones or specially modified HarrisTech microphone harnesses. The USBPre provides the end user a microphone pre-amplifier, line amplifier, 24 bit A/D and D/A, headphone jack, and line outputs all via the USB bus.

Features

  • Dynamic range greater than 106 dB (in 24-bit operation)
  • Flat 10 Hz to 22 kHz audio bandwidth
  • Exceptionally low distortion characteristics
  • Two inputs accept microphone, instrument, line, or tape level inputs
  • Input type is selected per channel - allowing two different signal types simultaneously
  • Phantom power (48-volt) for condenser microphones.
  • S/PDIF coaxial input and output
  • Six-segment, LED peak input meter
  • High power headphone monitor
  • Mix control enables headphone monitoring of analog source audio, computer audio, or a mix of both source and computer audio
  • Phono (RCA) jacks connect PC AUDIO output to external loudspeakers or preamplifiers
  • Bus powering from the USB port eliminates external power sources and batteries
  • High strength extruded aluminum chassis
  • Compact dimension (4.4 cm H x 18.5 cm W x 10.0 cm D)
  • Mac® OS 9, Sound Manager compatible
  • Windows 98®, Windows ME®, and Windows 2000® Wave audio and DirectSound compatible

 
  • Gain control for each input channel,
  • 48 V phantom power switch for mic inputs,
  • Input selection LED's and switch for the various input types,
  • Front panel meter calibrated in dB FS,
  • Headphone volume control,
  • Headphone "Mix" Control, controls monitoring source audio and computer audio,
  • Mono Headphone Monitoring Switch folds analog input sources to mono in the headphones.
  • Two-XLR inputs for balanced and unbalanced microphones,
  • 1/4-inch shared connectors for balanced and unbalanced line level sources and unbalanced high Z instruments,
  • RCA connectors for Aux level sources.
  • Two stereo headphone output jacks, 1/8-inch and 1/4-inch,
  • PC audio output carries computer audio signals,
  • S/PDIF input and output connects,
  • USB connector carries all connections and power with the computer.

Specifications

Frequency Response: (reference 1 kHz)

10 Hz - 20 kHz, +0.1, -0.5 dB (any input to PC recording)
10 Hz - 20 kHz, +/- 0.5 dB (PC source to PC AUDIO out)

THD+N: (10 Hz - 22 kHz measurement bandwidth)

0.05% max. (any input to PC recording, gain control at min., input driven to -6 dB FS)
0.005% max. (PC AUDIO output, 0 dB FS output, 100k load)
0.05% max. (HEADPHONES output, 2 V rms output, 600 ohm load)

E.I.N.: (MIC inputs)

-124 dBu max.
(10 Hz - 22 kHz bandwidth, 150 ohm source, gain control at 50% or more)

Inputs

  

Clip Level
(1% THD)

Sensitivity
(typical, for 0 dB FS)

Impedance (actual)

min. gain

max. gain

MIC

-12 dBu
(195 mV rms)

-10 dBu

–53 dBu

2k ohm
active-balanced

MIC
(w/ 15 dB pad)

+4 dBu
(1.2 V rms)

+5 dBu

-38 dBu

2k ohm
active-balanced

LINE

+24 dBu
(12.3 V rms)

+24 dBu

+7 dBu

65k ohm
active balanced

DI

+9 dBu
(2.2 V rms)

+8 dBu

–9 dBu

10M ohm
unbalanced

TAPE

+9 dBu
(2.2 v rms)

+8 dBu

–9 dBu

110k ohm
unbalanced

 

 

 

 

 

 

 

 

 

 

 

Output Clipping Levels: (1% THD, Windows Mixer at max.)

PC AUDIO:  +8.2 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 ohm
HEADPHONES:  20 ohms

A/D Converter:

24 bit resolution
106 dB min. dynamic range, 24 bit mode (10 Hz - 22 kHz bandwidth)
96 dB min. dynamic range, 16 bit mode (10 Hz - 22 kHz bandwidth)

D/A Converter:

16 bit resolution
92 dB min. dynamic range, 24 and 16 bit mode (10 Hz - 22 kHz bandwidth)

Sample Rates/ Bit Depths:

Recording: 8, 16, 24 bits at 32, 44.1, 48 kHz
Playback: 8, 16, 24 bits at 5 to 55 kHz

Master Clock: (recording)

PLL generated, low jitter

Metering:

Input level at A/D converter
6 segments, 30 dB total range, peak responding
0 dB (meter) = 0 dB FS

Phantom Power:

48 V through 6.8k resistors, each mic input will supply 10 mA

Software Driver Support:

Windows - Wave driver support, DirectSound I/O

Macintosh - Apple Sound Manager support, 16-bit operation for record and playback

Powering:

USB bus powered, 3 stage soft-start meets USB hot-plugging power requirements
5 V, 100 mA max current drawn during enumeration
5 V, 250 mA quiescent current from USB port
5 V, 500 mA max current from USB port

 

Windows PC -
Recommended System

Macintosh -
Recommended System
Operating System:

Windows 2000*
Windows XP

 Mac OS 9.1**
Processor: 400 MHz PII G3 350
RAM: 128 MB 256 MB physical
Bus Speed:

100 MHz
Hard Drive:

7200 rpm
Motherboard Chipset: Intel 440 BX or better with Intel 82371AB/EB Universal Host Controller

 not applicable
USB Connection:

Full 1.1 compliance, one USBPre per host/hub
Note to 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, spins down hard disks, shuts down displays, or a combination to reduce current consumption and extend battery run time.

* USB audio support in Windows 2000 is the most robust implementation of USB audio for Windows. Windows ME does not support 24 bit audio transfer over USB. Windows 98SE requires the addition of a Driver Model Audio Update for Windows 98 Second Edition for 24 bit support.

** Mac OS 9.X Sound Manager supports 16-bit audio only.

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