USB dual pre

The USB Dual Pre is a full-featured high quality dual
portable preamplifier and computer interface packed
into a compact rugged case.

It is designed to work over a wide variety of applications
from remote field recording to desktop/studio tracking.
Each of the two low noise input channels has up to 48
dB of clean gain with signal present and clip LED indicators.
Inputs can be either XLR balanced or 1/4-inch TRS. Each
of the 1/4-inch TRS outputs is buffered low impedance
balanced.

The USB Dual Pre is powered via the USB bus. An internal 9 Volt
battery, or optional external 12V power supply (or any combination
of USB, battery & power supply) can be used depending on
application. When running powered by battery alone, you should
expect in excess of 50 hours of operation with phantom power off.
Battery life will drop to approximately 20 hours (depending on microphone)
when phantom powering is engaged (still enough time to get through an average session).

The built-in low noise +48 Volt phantom power supply allows you to
power up to 2 microphones as well as the preamplifier when running
from any power sources including the USB bus.

For monitoring, an 1/8-inch TRS mini headphone jack with level and
monitor mix controls on the rear allow for latency free local monitoring
of the inputs while recording as well as playback monitoring of the USB
bus. The monitor mix is also routed to the 1/4-inch TRS balanced outputs.
This lets you use the 1/4-inch outputs as either preamplifier outputs or
as the monitor feed to your powered monitors.

The USB interface is fully compliant with the USB 1.1 specification and
uses USB adaptive mode for playback and USB asynchronous mode for
record. It will work with the USB audio device drivers built into Windows
98SE/ME/2000/XP/Vista and Apple OS9.1/OSX computers with native USB
support. No special drivers are needed.