Focusrite Scarlett 18i20 3rd Gen — Editorial Review

Focusrite Scarlett 18i20 3rd Gen — Editorial Review

The Scarlett 18i20 3rd Gen is Focusrite's rackmount flagship for the Scarlett range — an 18-in/20-out USB interface with eight mic preamps, built to track a full band in one pass without leaving the box.

Featured Video Review

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Eight Air-mode preamps and full-band I/O

MusicRadar and Focusrite note the unit carries eight 3rd-gen Scarlett mic preamps with a switchable Air mode that emulates Focusrite's ISA transformer voicing, a pad on every preamp for hot sources, and up to 24-bit/192 kHz conversion with improved dynamic range and lower noise over the prior generation. Ten balanced line outputs with Anti-Thump speaker switching plus two independently-levelled headphone outs cover monitoring and cue mixes, and ADAT in/out expands the preamp count further. In Julian Krause's measurement-focused review and test — featured above — it's bench-tested for real-world audio performance rather than spec-sheet claims.

Honest cons

• It's a 1U rack box. Far less portable than the desktop Scarletts — it wants a rack or a deep shelf.
• No onboard DSP or mixer effects. Routing is flexible via Focusrite Control, but there's no built-in compression/EQ like creator-focused interfaces.
• USB, not Thunderbolt. Fine for tracking, but round-trip latency at high channel counts trails Thunderbolt rivals.
• Eight pres is the ceiling without expansion. Going beyond a typical drum-plus-room setup means adding an ADAT preamp.

Where this interface fits

• Project and band studios needing to track drums plus a full band simultaneously.
• Engineers who value clean, well-measured preamps with the Air option for vocals and guitars.
• Rooms with a rack and outboard gear to patch through the line I/O.
• Not a grab-and-go mobile rig, an all-in-one streaming box, or a lowest-latency Thunderbolt setup.

Sources & Citations

1. MusicRadar, "Focusrite Scarlett 18i20 review," musicradar.com (accessed 2026-05-26)
2. Focusrite, "Scarlett 18i20 [3rd Gen] (product and technical overview)," us.focusrite.com (accessed 2026-05-26)

Last verified: 2026-05-26