USBPre is a portable professional solution to quickly and easily interfaces microphones, musical instruments, line level sources, and consumer audio electronics with personal computers. Designed for USB-equipped Macintosh OS 9, Windows 98 and Windows 2000 computers (desktop and notebook) USBPre is a complete hardware interface for PC-based digital recording.USBPre: Two-Channel Microphone interface for Hard Disk RecordingSound Devices USBPre is a complete, portable hardware interface for PC-based digital recordings. Designed for USB-equipped Macintosh OS 9 and Windows computers (98SE, 2000, and ME), USBPre quickly and easily interfaces microphones, line level sources, musical instruments, and consumer audio electronics with personal computers. Its high quality, 24-bit audio inputs offer the most direct signal path into the computer. All analog-to-digital and digital-to-analog conversion is done outside of the computer, in the USBPre, for superior audio performance.USBPre has the flexibility to work with most Windows and Mac recording and streaming software. Powered by the USB port from either notebook or desktop computers, no additional power source is required - the computer provides all power needed for operation. The durable construction and compact size of the USBPre allow no-compromise digital recording everywhere.Audio Performance:Dynamic range greater than 106 dB (in 24-bit operation)Flat 10 Hz to 22 Hz audio bandwidth.Exceptionally low distortion characteristics.Active-balanced microphone and line level inputs.High-impedance, low-noise DI instrument input.Audio Inputs: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.Level Metering:Six-segment, LED peak input meter for precise level control.Audio Monitoring:High power headphone circuit monitors source (input) audio and PC audio.Mix control enables headphone monitoring of source audio, computer audio, or mix of both sources and computer audio.Phone (RCA) jacks connect PC Audio output to external loudspeakers or preamplifiers.USB Powered:Bus powering from the USB port eliminates external power sources and batteries.Regulated internal DC/DC converter for low noise, consistent audio quality.Compact, Durable Mechanical ConstructionHigh strength extruded aluminum chassisCustom machined aluminum knobs.4.4 cm H x 1.8 cm W x 10.0 cm D ( 1.75 in, H x 7.25 in, W x 3.94 in, D)Computer Interface:Mac OS 9, Windows 98, Windows ME, and Windows 2000 compatible.