Focusrite Scarlett 18i20 4th Gen (2023)
Focusrite's flagship 4th-gen 1U rack interface offers 18 inputs and 20 outputs over a single USB-C connection (USB 2.0 protocol). Eight XLR/TRS combo inputs with Auto Gain and Air mode pair with ten balanced line outputs, two independent headphone outputs, dual ADAT optical I/O, coaxial S/PDIF I/O, 5-pin DIN MIDI, and a BNC Word Clock output. A built-in talkback mic routes to the headphones by default. Mains-powered via a 3-prong IEC C14 inlet.
Focusrite Scarlett 2i2 4th Gen (2023)
Focusrite's best-selling 4th-gen 2-in/2-out USB-C audio interface targets home-studio vocalists, podcasters, and producers. Each channel accepts mic or instrument via a combo XLR (rear) and 1/4-inch (front) input pair, with 48V phantom and Auto Gain. Balanced TRS outputs drive studio monitors and a 1/4-inch headphone jack sits on the front. The USB-C connector runs USB 2.0 protocol — no USB 3 bandwidth is used. Optional 5V DC input powers the unit when USB can't supply 900mA.
Focusrite Scarlett 4i4 4th Gen (2023)
The 4th-gen Scarlett 4i4 is a 4-in/4-out USB-C interface for producers needing MIDI hardware and independent headphone mixes. Inputs 1–2 are front-panel XLR/TRS combo jacks with Auto Gain and Air mode; inputs 3–4 are rear balanced 1/4-inch line-level for synths or outboard preamps. Four balanced line outputs plus a dedicated headphone output handle monitoring. A 5-pin DIN MIDI In/Out pair connects hardware. USB-C runs USB 2.0 protocol, bus-powered with optional 5V DC inlet.
Focusrite Scarlett Solo 4th Gen (2023)
The 4th-gen Scarlett Solo is Focusrite's single-preamp USB-C interface for solo performers: one XLR mic input plus one dedicated 1/4-inch Hi-Z instrument input, with Auto Gain and Air mode. Two balanced 1/4-inch TRS line outs drive studio monitors, and a 1/4-inch headphone jack sits on the front. The USB-C port runs at USB 2.0 speeds, class-compliant with Mac, Windows, and iPad. 24-bit/192kHz conversion with 120 dB dynamic range round out the spec.
MOTU's M2 is a 2-in/2-out bus-powered USB-C audio interface with ESS Sabre32 Ultra converters and a 120 dB dynamic-range spec on outputs. Two front-panel XLR/TRS combo inputs take mic, line, or Hi-Z signals with 48V phantom. Two balanced 1/4-inch TRS outs drive studio monitors, with RCA outputs mirroring them for unbalanced gear, plus a front 1/4-inch headphone jack. Two 5-pin DIN MIDI sockets cover hardware integration. USB-C runs USB 2.0 protocol with 2.5 ms round-trip latency at 96 kHz.
MOTU's M4 is a 4-in/4-out bus-powered USB-C audio interface using the same ESS Sabre32 Ultra converters as the M2, with a 120 dB dynamic-range spec on outputs. Two front-panel XLR/TRS combo jacks take mic, line, or Hi-Z instrument with 48V phantom, and two rear 1/4-inch TRS inputs accept balanced line gear. Four balanced TRS outputs (with matching RCAs for unbalanced monitors) drive two independent speaker pairs or reamp rigs, plus a 1/4-inch headphone jack. Full 5-pin DIN MIDI I/O rounds out connectivity. USB-C runs USB 2.0 protocol.
RME's Babyface Pro FS is a portable 12-in/12-out USB 2.0 interface using femtosecond-clock SteadyClock FS and dual-stage headphone amps. The rear panel carries two XLR mic inputs and two balanced XLR line outputs, with two 1/4-inch TRS inputs for line/Hi-Z sources on the side. Parallel 1/4-inch and 3.5-mm headphone outputs share the same discrete driver stage. An optical TOSLINK I/O pair provides ADAT (up to 8ch with SMUX) or S/PDIF, and host connectivity is a full-size USB Type-B (USB 2.0) socket. MIDI I/O is routed through an included proprietary multi-pin breakout cable to two 5-pin DIN jacks.
The SSL 2+ is Solid State Logic's original desktop 2-in/4-out USB-C audio interface for songwriters and project studios, carrying the brand's mic preamp with a '4K' legacy-console harmonic mode. Two rear Neutrik combo jacks accept mic, line, or Hi-Z instrument, with 48V phantom and switchable 4K. Balanced 1/4-inch TRS main outputs drive studio monitors, with a parallel RCA pair mirroring them and an independent RCA 3/4 output for headphone cue sends or DJ software. Two front 1/4-inch headphone outs and 5-pin DIN MIDI I/O complete the feature set over a USB-C (USB 2.0) host link.
Universal Audio Apollo Twin X (2019)
UA's Apollo Twin X is a desktop 10x6 Thunderbolt 3 interface built around Unison-enabled mic preamps and onboard UAD SHARC processing (DUO or QUAD variants). Two combo XLR/TRS inputs and a dedicated front-panel 1/4-inch Hi-Z jack feed the preamps. Two balanced 1/4-inch monitor outputs and two 1/4-inch line outputs cover stereo monitoring plus an auxiliary pair, with a front TRS headphone out. An optical TOSLINK input carries ADAT or S/PDIF for eight channels of external expansion. Power comes from the included external supply — Thunderbolt bus power is not supported.
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