Audiofrog USB-Duo

Compact, High-Performance, Dual-Channel USB Soundcard

The USB-Duo has been designed to provide high quality stereo recording when using
prepolarized condenser (electret) microphones. A bias voltage of 2.7 VDC is provided

on the microphone inputs. Typical input and output frequency response is 20Hz - 20kHz
(+0, -0.5 dB). USB-Duo can be used with Macs and PCs, tablets and phones. USB-Duo
uses the standard USB audio driver and no additional app is required to use the device.
A USB-C to USB-A adapter is included.
USB-Duo can be used with a loopback connection for dual channel FFT analysis,
including impulse and phase, with Room EQ Wizard, SMAART, Open Sound Meter and
a host of additional acoustic analysis programs. For this, be sure to add an Audiofrog
UMI-1 and the loopback connector when you make your purchase.
Works great as a portable mic preamp for the Audiofrog BHM-1 binaural head
microphone. Make field recordings with your phone!

Technical Details
Specifications:
Frequency Response: 20Hz-20kHz, +0,-2dB (+0,-0.5dB typical).
Maximum Output Voltage: 500mV
ADC Sample Rate: 44.1kHz - 48kHz, 16 Bit
DAC Sample Rate: 44.1kHZ - 48kHZ, 16 Bit
THD + N: <= 0.01%
Power Supply: 5 VDC, 100 mA
Microphone Gain (Software): 0-30 dB
Microphone Bias Voltage: 2.7 VDC
Microphone Input Pin-Out (3.5 mm): Tip: +, Ring: -
Headphone Output Pin-Out (3.5 mm): Tip: L+, Ring: R+, Sleeve: - (GND)