Focusrite Scarlett 18i8 USB-C Audio/MIDI Interface (3rd Generation) - Manual (Page 26)

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Instrument Inputs
Frequency Response 20 Hz to 20 kHz ±0.1 dB
Dynamic Range 110 dB (A-weighted)
THD+N
< 0.03% (minimum gain, -1 dBFS input with
22 Hz/22 kHz bandpass filter)
Maximum input level +12.5 dBu at minimum gain
Gain Range 56 dB
Line Inputs 5 to 8
Frequency Response 20 Hz to 20 kHz ±0.1 dB
Dynamic Range 110.5 dB (A-weighted)
THD+N
< 0.002% (minimum gain, -1 dBFS input with
22 Hz/22 kHz bandpass filter)
Maximum input level 18 dBu at minimum gain
Line Outputs 1 to 4
Frequency Response 20 Hz to 20 kHz ±0.1 dB
Dynamic Range 108.5 dB (A-weighted)
THD+N
< 0.002% (minimum gain, -1 dBFS input with
22 Hz/22 kHz bandpass filter)
Maximum Output Level (0 dBFS) 15.5 dBu (balanced)
Headphone Outputs
Frequency Response 20 Hz to 20 kHz ±0.1 dB
Dynamic Range 104 dB (A-weighted)
THD+N
< 0.002% (measured at +6 dBu with
22 Hz/22 kHz bandpass filter)
Maximum Output Level +7 dBu