Alesis

iO2 Portable 2-Channel USB Audio Interface

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The Alesis iO2 audio interface has the the following features:

24-bit, 48 kHz operation with high-end A/D and D/A conversion through integrated USB audio interface
2 XLR mic inputs with 48V phantom power plus 2 1/4" balanced line inputs that can accept guitar level signals
1/4" balanced main outputs
1/4" TRS inserts on input channels
1/4" TRS headphone output
Dedicated four segment signal/clip LED meter on both channels
Ultra low-latency ASIO 2.0 drivers (with zero-latency hardware monitoring)
24-bit S/PDIF I/O for direct digital recording
MIDI Input/Output
USB powered—no external AC power supply necessary
Low power usage for minimal laptop battery drain
Bundled with Steinberg Cubase LE software
Mac OS X, Windows XP (32-bit) and Vista (32-bit) compatible

FREQUENCY RESPONSE:

SIGNAL-TO-NOISE RATIO (SNR):

MIC/LINE IN (balanced) to INSERT OUT: 110dB A-weighted, input impedance at XLR or 1/4" jack = 600 Ohms, Input Gain = minimum
GUITAR IN (unbalanced) to INSERT OUT: 99dB A-weighted, input impedance at 1/4" jack = 600 Ohms, Input Gain = minimum
MIC/LINE IN (balanced) to SPDIF/USB OUT: 99dB A-weighted, input impedance at MIC or LINE jack = 600 Ohms, Input Gain = minimum
GUITAR IN (unbalanced) to SPDIF/USB OUT: 94dB A-weighted, input impedance at 1/4" jack = 600 Ohms, Input Gain = minimum
MIC/LINE IN (balanced) to MAIN OUT (through ADC/DAC): 97dB A-weighted, input impedance at MIC or LINE jack = 600 Ohms, Input Gain = minimum
MIC/LINE IN (balanced) to MAIN OUT (through direct monitor): 95dB A-weighted, input impedance at MIC or LINE jack = 600 Ohms, Input Gain = minimum

TOTAL HARMONIC DISTORTION + NOISE (THD+N):

MIC/LINE IN (balanced) to INSERT OUT: <0.001% Input Gain = minimum, 1KHz input signal, INSERT OUT = 5.7dBV
GUITAR IN (unbalanced) to INSERT OUT: 0.034% Input Gain = minimum, 1KHz input signal, INSERT OUT = 5.3dBV
MIC/LINE IN (balanced) to SPDIF/USB OUT: 0.003% Input Gain = minimum, 1KHz input signal, DIGITAL OUT = -0.3dBFS
GUITAR IN (unbalanced) to SPDIF/USB OUT: 0.034% Input Gain = minimum, 1KHz input signal, DIGITAL OUT = -0.7dBFS
MIC/LINE IN (balanced) to MAIN OUT (through ADC/DAC): 0.005% Input Gain = minimum, 1KHz input signal, MAIN OUT = 5.6dBV
MIC/LINE IN (balanced) to MAIN OUT (through direct monitor): 0.006% Input Gain = minimum, 1KHz input signal, MAIN OUT = 5.6dBV