Focusrite Scarlett 18i20 USB-C Audio/MIDI Interface (3rd Generation) - Manual (Page 32)

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THD+N
< 0.03% (minimum gain, -1 dBFS input with 22 Hz/22 kHz
bandpass filter)
Maximum Input Level
+12.5 dBu (no PAD); +14 dBu (PAD selected); measured at
minimum gain
Gain Range 56 dB
Input Impedance 1.5 Mohms
Line Outputs 1 to 10
Dynamic Range 108.5 dB (A-weighted)
Maximum Output Level (0 dBFS) +15.5 dBu (balanced)
THD+N
< 0.002% (minimum gain, -1 dBFS input with 22 Hz/22 kHz
bandpass filter)
Output Impedance 430 ohms
Headphone Outputs
Dynamic Range 104 dB (A-weighted)
Maximum Output Level +7 dBu
THD+N
< 0.002% (measured at +6 dBu with 22 Hz/22 kHz bandpass
filter)
Output Impedance < 1 ohm