Focusrite's line of Scarlett interfaces continue to raise the bar and the 18i8 is a feature packed interface in a relatively small package. Four of Focusrite's award-winning preamplifiers adorn the front of the interface for easy access while the back offers an additional four line inputs. But don't fret as the additional ADAT optical input will allow for eight more channels of input when it comes time to expand your setup. The additional S/PDIF input/output gives you an additional stereo in and out for other devices that support the protocol. Add standard five-pin MIDI ins and outs, multiple outputs for headphones and a library of bundled software, and this interface becomes the perfect solution for recording your next project! Features and specs: SUPPORTED SAMPLE RATES 44.1 kHz, 48 kHz, 88.2 kHz, 96 kHz, 176.4 kHz, 192 kHz SUPPORTED OPERATING SYSTEMS Mac OS and Windows MICROPHONE INPUTS Frequency Response 20 Hz - 20 kHz +0.5/-1.5 dB Dynamic Range 109 dB (A-Weighted) THD+N <0.002% Noise EIN -127 dBu Maximum input level +8.5 dBu Gain Range 50 dB Impedance 3k Ω LINE INPUTS 1-4 Frequency Response 20 Hz - 20 kHz +0.5/-1.5 dB Dynamic Range 109 dB (A-Weighted) THD+N <0.003% Maximum input level +22 dBu Gain Range 50 dB Impedance 52k Ω LINE INPUTS 5-8 Frequency Response 20 Hz - 20 kHz +0.5 dB Dynamic Range 110 dB (A-Weighted) THD+N <0.003% Maximum input level +16 dBu Impedance 52k Ω INSTRUMENT INPUTS Frequency Response 20 Hz - 20 kHz +0.5/-1.5 dB Dynamic Range 109 dB (A-Weighted) THD+N <0.003% Maximum input level +12 dBu Gain Range 50 dB Impedance 1M Ω MONITOR OUTPUTS (1-2) Frequency Response 20 Hz - 20 kHz ±0.5 dB Dynamic Range (Line Outputs) 108 dB (A-Weighted) THD+N <0.001% Maximum Output Level (0 dBFS) +16 dBu Impedance 94 Ω (Balanced) HEADPHONE OUTPUTS Frequency Response 20 Hz - 20 kHz ±0.5 dB Dynamic Range 108 dB (A-Weighted) THD+N <0.001% Maximum Output Level +13 dBu Impedance 10 Ω