Focusrite Scarlett 18i20 4th Gen Audio Interface

The Focusrite Scarlett 18i20 4th Gen is a powerful 18-in/20-out USB-C audio interface designed for professional project studios. Featuring 8 ultra-low-noise mic preamps with remote control, Auto Gain, Clip Safe, and two switchable Air modes, it delivers 122dB dynamic range and pristine 24-bit/192kHz resolution. With ADAT and S/PDIF expansion, word clock, talkback, A/B speaker switching, and Focusrite Control 2 (desktop + mobile), it's the perfect hub for serious music production.

At-a-Glance Highlights

• 8 remote-controllable mic preamps with 122dB dynamic range
  
• Auto Gain and Clip Safe prevent distortion from level spikes
  
• Two Air modes with Presence and Harmonic Drive for analog-style tone
  
• Control from anywhere using Focusrite Control 2 desktop and mobile apps
  
• ADAT, S/PDIF, and Word Clock for system expansion and sync
  
• Built-in talkback mic and A/B speaker switching for pro monitoring
  

Physical Dimensions & Weight

• Height: 46.55 mm
• Width: 442 mm
• Depth: 259.73 mm
• Weight: 3.304 kg
  

Supported Sample Rates

• 44.1 kHz
• 48 kHz
• 88.2 kHz
• 96 kHz
• 176.4 kHz
• 192 kHz
  

Microphone Inputs

• Frequency Response: 20 Hz – 20 kHz ±0.06 dB
• Dynamic Range: 116 dB (A-weighted)
• THD+N: -100 dB @ 8 dB gain
• Equivalent Input Noise (EIN): -127 dBu (A-weighted)
• Maximum Input Level: 16 dBu
• Gain Range: 69 dB
• Impedance: 3 kΩ

Variable Line Inputs

• Frequency Response: 20 Hz – 20 kHz ±0.05 dB
• Dynamic Range: 115.5 dB (A-weighted)
• THD+N: -100 dB @ 8 dB gain
• Maximum Input Level: 22 dBu
• Gain Range: 69 dB
• Impedance: 24 kΩ
  

Instrument Inputs

• Frequency Response: 20 Hz – 20 kHz ±0.05 dB
• Dynamic Range: 113 dB (A-weighted)
• THD+N: -80 dB @ 8 dB gain
• Maximum Input Level: 12 dBu
• Gain Range: 62 dB
• Impedance: 1 MΩ

Line Outputs (Balanced)

• Frequency Response: 20 Hz – 20 kHz ±0.02 dB
• Dynamic Range: 122 dB (A-weighted)
• THD+N: -112 dB
• Maximum Output Level: 16 dBu
• Impedance: 200 Ω
  

Headphone Outputs

• Frequency Response: 20 Hz – 20 kHz ±0.1 dB (measured at 33Ω / 300Ω)
• Dynamic Range:
• 112 dB @ 33 Ω
• 116 dB @ 300 Ω
• THD+N:
• -100 dB @ 33 Ω (minimum)
• -110 dB @ 300 Ω (minimum)
• Maximum Output Level:
• 5 dBu into 33 Ω
• 11 dBu into 300 Ω
• Maximum Output Power:
• 57 mW into 33 Ω
• 27 mW into 300 Ω
• Output Impedance: 11 Ω

Converters

• Analogue to Digital Converter (ADC):
• THD+N: -110 dB
• Dynamic Range: 120 dB
• Digital to Analogue Converter (DAC):
• THD+N: -115 dB
• Dynamic Range: 130 dB (A-weighted)

Power Supply

• External Power: 30 W