User Guide for Focusrite Scarlett 18i8 3rd Gen Audio Interface

Quick Start and Setup

The Scarlett 18i8 3rd Gen is designed for quick setup. Connect the device to your computer using the provided USB cable and power it using the supplied 12V DC mains adapter. Upon first connection, the device will be in Easy Start mode. Follow the on-screen instructions to register your device and download the Focusrite Control software. Installing this software is essential to unlock full functionality, including sample rates up to 192 kHz and MIDI I/O.

Hardware Overview

Front Panel: Features four combo inputs (XLR/jack) for microphones, instruments, and line-level signals. Each input has dedicated gain controls with tri-colour LED rings for signal level monitoring. Additional controls include 48V phantom power switches, AIR mode buttons, PAD buttons, monitor level control, and two headphone outputs.

Rear Panel: Includes four balanced line inputs, four balanced line outputs, optical input (ADAT/SPDIF), MIDI I/O, USB-C port, and the power input. A Kensington security slot is also provided.

Key Features

• AIR Mode: Modifies the preamp frequency response to model the classic transformer-based Focusrite ISA preamps, enhancing clarity for vocals and acoustic instruments.
• PAD Function: Decreases input signal level by 10 dB, useful for high-level sources to prevent clipping.
• Loopback: Virtual inputs that allow you to record audio from your computer (e.g., from a web browser) back into your DAW.
• ALT Function: Enables switching between two pairs of monitor speakers connected to Line Outputs 1-2 and 3-4.

Software Configuration

Focusrite Control is the central application for routing and monitoring. It allows you to configure monitor mixes, set sample rates, and manage hardware settings. Ensure you manually select 'Focusrite USB ASIO' as the driver in your DAW's audio setup preferences to ensure proper communication with the interface.

Usage Examples

• Microphones and Instruments: Connect directly to the front panel combo inputs. The preamp automatically configures for mic or line/instrument levels. Use the 48V button for condenser microphones.
• Loudspeakers: Connect active monitors to Line Outputs 1 and 2. Use Line Outputs 3 and 4 for secondary monitors or outboard FX processors.
• ADAT Connection: Expand your input capability by connecting an 8-channel preamp (like the Focusrite Scarlett OctoPre) to the optical input.
• Stand-alone Mixer: You can store a mix configuration in the hardware, allowing the interface to function as a local mixer without a computer connection.

Troubleshooting

For all technical support queries, please visit the Focusrite Help Centre at support.focusrite.com. Ensure you are using a USB 2.0+ compliant port and the supplied power adapter to avoid performance issues.