ART Pro Audio

The USBDualTubePre is the ultimate compact dual channel tube preamp for any basic recording system. Capable of operating as a standalone unit with USB audio interface, or as an expander for any digital system with s/pdif digital input, each channel in the USBDualTubePre delivers superior tube tone in a fully
featured input strip.

Each input of the USBDualTubePre has independent input gain control and output level, phase inversion, low frequency roll-off, true 48v phantom power and a user defeatable opto-compressor circuit capable ensuring superior dynamic control or any input source.
For monitoring, an 1/8-inch TRS mini headphone jack with level and monitor mix controls allow latency free local monitoring of the inputs while recording as well as playback monitoring of audio mix via the USB bus. The monitor mix is also routed to the 1/4-inch TRS balanced outputs with separate level control for control room monitor source.
The USB interface is fully USB compliant. No special drivers are needed.
Features
Two channel Tube based Mic/Instrument preamp computer interface
Extremely low noise discrete front end with variable input and output controls
Advanced optical output compressor to simplify recording and prevent overload
USB connectivity to desktop and laptop computers
S/PDIF output for expanding inputs on digital workstations and computer interfaces
Latency free Monitoring Mix and Level controls
Balanced XLR for lo-Z applications and 1/4" hi-Z inputs for instrument DI applications
Separate Gain, Phase Invert, Low Cut Filter and Compressor switches on each input
Selectable Dual or Stereo operation of output controls
Switch selectable Inserts on each channel
Insert jacks provide a preamp direct out for each channel
Stereo/ Dual operation of Optical Compressor
Mono switch for single input monitoring
S/PDIF Sample Rate switch selectable between 44.1K and 48K
Precision LED metering of both the preamp and A/D sections
Built-in low noise +48 Volt phantom power supply
Compact, stackable all aluminum chassis

SPECIFICATIONS:
Input Connections: XLR / 1/4-inch Combo jack - XLR balanced or 1/4" unbalanced
Input Impedance: 1M Ohms 1/4-inch input, >4K Ohms XLR input, 20K Ohms Insert Input
Output Connection: /4-inch TRS balanced, 1/8-inch TRS headphone mini jack
Output Impedance: 600 Ohms (balanced 1/4-inch), 300 Ohms (INSERTS), < 50 Ohms (headphone 1/8-inch)
Frequency Response: 20 Hz 27K Hz (+0, -1 dB)
Maximum Gain: +65 dB (balanced in-out), +45dB (unbalanced input, balanced output)
THD: <0.01% @ 1K Hz
CMRR: >60 dB
Equivalent Input Noise: -129 dBu typical (A wtd., Shorted XLR balanced input, gain @ maximum)
Maximum Input Level: unbalanced (Inst): +16 dBu, balanced (mic): +12dBu, Insert input : +7.5dBu
Max Output Level: unbalanced: +5dBu, balanced: +11dBu, +7.5dBu (insert output)
Phantom Power: Switch selectable, +48Volts DC, filtered, current limited
Tube Type: Hand Selected 12AX7A
Compressor Slope:Progressively increasing slope, 10:1 max.
Compressor Range: 28dB of attenuation max.
Low Cut Filter: -3dB @ 70Hz, 6dB/Octave
USB A/D-D/A: 16 Bit, 44.1K Hz or 48K Hz, USB selectable from computer, 0.4 ms A/D latency @ 44.1K Hz
S/PDIF A/D: 24 bit, 44.1K or 48KHz switch selectable, 0.4 ms A/D latency @ 44.1K Hz
Computer Interface: USB 2.0 compliant, Windows 98SE/ME/2000/XP/Vista,Win 7, Apple OS9.1/OSX computers with native USB support
Chassis Type: All aluminum black anodized with integral rubber sides
Power Requirements: 9VAC @ 1000mA (external)
Dimensions: 1.75H x 5.9W x 6.5D (44.5mm x 150mm x 165mm)
Weight: 2.5 lbs. (1.14 kg) with power supply and packaging