Focusrite Scarlett 18i8 18×8 USB Audio/MIDI Interface

Audio Inputs & Outputs

  • Analog Inputs:

    • 4 x combo XLR-1/4″ TRS inputs (2 with mic/line/Hi-Z, 2 with mic/line)

    • 4 x 1/4″ TRS balanced line inputs (rear panel)

  • Analog Outputs:

    • 4 x 1/4″ TRS balanced line outputs

    • 2 x 1/4″ TRS headphone outputs with independent level controls

  • Digital I/O:

    • 1 x TOSLINK optical input (ADAT) for up to 8 additional channels

    • 1 x RCA coaxial S/PDIF input

    • 1 x RCA coaxial S/PDIF output

  • MIDI I/O:

    • 1 x 5-pin MIDI input

    • 1 x 5-pin MIDI output

Microphone Preamps

  • 4 x 3rd Generation Scarlett mic preamps with up to 56 dB gain range

  • Switchable Air mode for enhanced high-frequency response, emulating Focusrite’s ISA preamps

  • +48V phantom power available for condenser microphones

Performance

  • Conversion:

    • 24-bit/192 kHz A/D and D/A converters

  • Dynamic Range:

    • Mic Inputs: 111 dB (A-weighted)

    • Line Inputs: 110.5 dB (A-weighted)

    • Line Outputs: 108 dB

    • Headphone Outputs: 104 dB (A-weighted)

  • Frequency Response:

    • 20 Hz – 20 kHz ±0.1 dB

  • THD+N:

    • Mic Inputs: < 0.0012%

    • Line Inputs: < 0.002%

    • Headphone Outputs: < 0.002%

Software & Connectivity

  • USB-C connectivity (USB 2.0 protocol) compatible with macOS, Windows, and iPadOS

  • Includes Focusrite Control software for routing and monitoring

  • Bundled software:

    • Ableton Live Lite

    • Avid Pro Tools Intro+

    • Hitmaker Expansion (featuring plugins from Antares, Softube, XLN Audio, and more)

Physical & Power

  • Dimensions: 9.49″ x 6.28″ x 2.4″ (241 mm x 159.5 mm x 61 mm)

  • Weight: Approximately 2.94 lbs (1.335 kg)

  • Power Supply: 12V DC, 1A (included)

The Focusrite Scarlett 18i8 (3rd Generation) is a versatile USB audio and MIDI interface designed for musicians, producers, and content creators who require multiple inputs and outputs for recording and monitoring. Its compact form factor and robust feature set make it suitable for both studio and mobile recording environments.