{
  "category": {
    "slug": "audio-interfaces",
    "name": "Audio Interfaces",
    "description": "USB and Thunderbolt audio interfaces for recording, with microphone preamps and line inputs, from 2-channel desktop units to rack interfaces; microphones, DJ controllers, digital mixers and headphone amplifiers are separate."
  },
  "url": "https://stierproducts.com/categories/audio-interfaces",
  "markdown": "https://stierproducts.com/categories/audio-interfaces.md",
  "updated": "2026-09-23T22:47:32.949Z",
  "productsRanked": 15,
  "citedSources": 99,
  "citedSourceKinds": {
    "editorial": 61,
    "video": 34,
    "community": 4
  },
  "summary": "On the stierproducts audio interfaces board, MOTU M2 ranks #1 in S tier, ahead of Focusrite Scarlett 2i2 4th Gen (#2, S tier) and RME Fireface 802 FS (#3, A tier). The board ranks 15 audio interfaces from S (best) to F (avoid), last researched 23 Sept 2026, drawing on 99 cited reviews, videos and discussions. Placed in the bottom tiers as ones to avoid: Focusrite Scarlett Solo 4th Gen, Universal Audio Apollo x8p Gen 2, Audient iD14 MkII, and 2 others.",
  "method": {
    "summary": "Each category is researched in four independent runs, one per lens (expert consensus, value, reliability, community pulse). Every run ranks a board of candidates that deliberately includes products buyers cross-shop but should avoid. Placements score on a ranked ladder (LP), and tiers are derived from LP, so no tier is ever assigned by hand.",
    "url": "https://stierproducts.com/methodology"
  },
  "limitations": [
    "We do not test products ourselves. Every placement is consolidated from published reviews, owner reports and community discussion, so a board is only as good as the sources behind it.",
    "LP is points on this category ladder. It is comparable within a category and never across categories.",
    "A board is a snapshot with a research date. Anything released or changed after that date is not in it yet.",
    "Evidence is uneven across this board: products carry between 1 and 27 cited sources. The count for each is in the table above."
  ],
  "dataset": {
    "doi": "10.5281/zenodo.22062813",
    "url": "https://doi.org/10.5281/zenodo.22062813",
    "scope": "every board at once, one dated snapshot per release",
    "excludes": [
      "price",
      "currency",
      "image"
    ]
  },
  "license": {
    "name": "CC BY 4.0",
    "url": "https://creativecommons.org/licenses/by/4.0/",
    "terms": "https://stierproducts.com/license",
    "covers": [
      "text",
      "rankings",
      "tiers",
      "lp",
      "verdicts",
      "pros",
      "cons"
    ],
    "excludes": [
      "images"
    ],
    "imageRights": "Product photographs are not covered: they belong to their respective owners and are reproduced to illustrate the product being reviewed. Do not redistribute them under this licence."
  },
  "tierMeanings": {
    "S": "Exceptional. Finishes top run after run; capped at 3 slots per category.",
    "A": "Excellent. Strongly recommended, beaten only by the very best.",
    "B": "Good. A solid choice with real caveats worth knowing.",
    "C": "Fair. Acceptable in the right situation, outclassed at its price.",
    "D": "Weak. Hard to recommend when better options cost similar money.",
    "F": "Avoid. The evidence points you elsewhere."
  },
  "products": [
    {
      "rank": 1,
      "tier": "S",
      "lp": 964,
      "name": "MOTU M2",
      "brand": "MOTU",
      "slug": "motu-m2",
      "url": "https://stierproducts.com/products/motu-m2",
      "verdict": "Identical driver pedigree and build philosophy in a two-channel body. Ranked below the M4 only because two channels obsolesce sooner.",
      "pros": [
        "Same driver pedigree as the M4 in a two-channel desktop body",
        "Better screen and metering than anything else near it",
        "MOTU's reliability and up-to-date drivers keep owners loyal",
        "Full-color LED meters give it a monitoring edge over rivals near it in the market",
        "ESS converters deliver better measured conversion quality than the Scarlett line without moving up a price class"
      ],
      "cons": [
        "Two channels age faster than four",
        "Slightly less preamp character than the Audient iD4 and LEWITT Connect 2"
      ],
      "citations": 27,
      "distinctOutlets": 24,
      "thinlySourced": false,
      "image": "https://stspimgdevmfyk46r5vwkay.blob.core.windows.net/images/products/motu-m2.webp"
    },
    {
      "rank": 2,
      "tier": "S",
      "lp": 952,
      "name": "Focusrite Scarlett 2i2 4th Gen",
      "brand": "Focusrite",
      "slug": "focusrite-scarlett-2i2-4th-gen",
      "url": "https://stierproducts.com/products/focusrite-scarlett-2i2-4th-gen",
      "verdict": "The mainstream default, and rightly so under this lens. Not the most durable brand here, but the support network and parts ubiquity are unmatched.",
      "pros": [
        "4th Gen fixed the gain-range and instrument-input complaints of its ancestors",
        "Logically laid-out controls",
        "Unmatched support network and parts ubiquity",
        "The default recommendation for most musicians",
        "4th Gen improved the converters, preamp gain and instrument input over the previous generation"
      ],
      "cons": [
        "Will not outlive an RME",
        "Slightly behind Audient and MOTU on preamp and converter pedigree",
        "Slightly lower value-per-dollar compared with the top three picks",
        "Consumer-grade chassis",
        "Support not as robust as top-tier brands"
      ],
      "citations": 15,
      "distinctOutlets": 14,
      "thinlySourced": false,
      "image": "https://stspimgdevmfyk46r5vwkay.blob.core.windows.net/images/products/focusrite-scarlett-2i2-4th-gen.webp"
    },
    {
      "rank": 3,
      "tier": "A",
      "lp": 742,
      "name": "RME Fireface 802 FS",
      "brand": "RME",
      "slug": "rme-fireface-802-fs",
      "url": "https://stierproducts.com/products/rme-fireface-802-fs",
      "verdict": "Decade-plus driver support, the lowest failure-rate reputation in the category, and rack-grade build. Nothing else here is as safe a ten-year bet.",
      "pros": [
        "Driver support runs for a decade or more per platform",
        "Lowest failure-rate reputation in the category",
        "Rack-grade build quality",
        "Flagship expression of RME's durability track record",
        "Arguably the best-built unit here"
      ],
      "cons": [
        "Per-channel cost is the highest of any pick",
        "High price primarily reflects reliability rather than audible advantage",
        "Requires rack space",
        "Good largely because it is expensive",
        "Comparable preamp counts and I/O available for meaningfully less"
      ],
      "citations": 7,
      "distinctOutlets": 7,
      "thinlySourced": false,
      "flaggedToAvoid": {
        "runs": 1,
        "ofRuns": 12
      },
      "image": "https://stspimgdevmfyk46r5vwkay.blob.core.windows.net/images/products/rme-fireface-802-fs.webp"
    },
    {
      "rank": 4,
      "tier": "A",
      "lp": 722,
      "name": "Audient iD4 MkII",
      "brand": "Audient",
      "slug": "audient-id4-mkii",
      "url": "https://stierproducts.com/products/audient-id4-mkii",
      "verdict": "The best-built beginner interface available, with preamps that outclass its price point. Two channels are the only limit.",
      "pros": [
        "Same preamp DNA as the iD48",
        "Preamps praised above the field in community testing",
        "Audient's console-derived preamp design at an entry price",
        "Super easy to use, named a top pick for anyone completely new to recording",
        "Treated by Audio Science Review forum users as one of the two serious objective-performance choices at the entry level"
      ],
      "cons": [
        "Two channels limit its useful life more than its hardware does"
      ],
      "citations": 8,
      "distinctOutlets": 7,
      "thinlySourced": false,
      "image": "https://stspimgdevmfyk46r5vwkay.blob.core.windows.net/images/products/audient-id4-mkii.webp"
    },
    {
      "rank": 5,
      "tier": "A",
      "lp": 712,
      "name": "MOTU M4",
      "brand": "MOTU",
      "slug": "motu-m4",
      "url": "https://stierproducts.com/products/motu-m4",
      "verdict": "Rock-solid drivers, CueMix monitoring, and a brand whose seven-year-old units still get current OS support. The best four-channel ownership story outside RME.",
      "pros": [
        "Four channels of well-measuring I/O",
        "CueMix zero-latency monitoring",
        "Driver history that has kept decade-old MOTU boxes current",
        "Owners report happy long-term ownership with reliable sound and up-to-date drivers",
        "Four excellent channels of MOTU conversion"
      ],
      "cons": [
        "Driver issue reported at the two lowest buffer settings"
      ],
      "citations": 16,
      "distinctOutlets": 15,
      "thinlySourced": false,
      "image": "https://stspimgdevmfyk46r5vwkay.blob.core.windows.net/images/products/motu-m4.webp"
    },
    {
      "rank": 6,
      "tier": "B",
      "lp": 607,
      "name": "Audient iD48",
      "brand": "Audient",
      "slug": "audient-id48",
      "url": "https://stierproducts.com/products/audient-id48",
      "verdict": "Console-grade preamps in a steel chassis with well-maintained iD software. A boutique sound with mainstream support discipline.",
      "pros": [
        "Console-derived preamps praised as the best sound quality in user testing",
        "Steel desktop-rack chassis",
        "iD software mixer maintained across years of OS updates",
        "Eight console-derived preamps at a mid-tier price",
        "Brings Audient's console-grade preamps into the rack class"
      ],
      "cons": [
        "long-term field data thinner than MOTU"
      ],
      "citations": 9,
      "distinctOutlets": 9,
      "thinlySourced": false,
      "image": "https://stspimgdevmfyk46r5vwkay.blob.core.windows.net/images/products/audient-id48.webp"
    },
    {
      "rank": 7,
      "tier": "B",
      "lp": 578,
      "name": "Solid State Logic SSL 18",
      "brand": "Solid State Logic",
      "slug": "solid-state-logic-ssl-18",
      "url": "https://stierproducts.com/products/solid-state-logic-ssl-18",
      "verdict": "The strongest new-platform bet here, with serious build and SSL's support reputation behind it. It loses to the iD48 only on unproven long-term track record.",
      "pros": [
        "Substantial warranty behind a genuinely current-generation platform",
        "Serious build and channel count",
        "Backed by SSL's long pro-audio support reputation",
        "Massive I/O count",
        "SSL's legacy preamp design"
      ],
      "cons": [
        "New enough that its long-term failure record is still being written",
        "Extra features increase price faster than they improve recording quality",
        "Much of the feature set goes unused by most buyers",
        "long-term field data still accumulating"
      ],
      "citations": 1,
      "distinctOutlets": 1,
      "thinlySourced": true,
      "image": "https://stspimgdevmfyk46r5vwkay.blob.core.windows.net/images/products/solid-state-logic-ssl-18.webp"
    },
    {
      "rank": 8,
      "tier": "B",
      "lp": 568,
      "name": "Behringer UMC404HD",
      "brand": "Behringer",
      "slug": "behringer-umc404hd",
      "url": "https://stierproducts.com/products/behringer-umc404hd",
      "verdict": "Four capable preamps and honest converters for very little money. Held out of the top half by QC variance and thinner driver attention.",
      "pros": [
        "Four Midas preamps and honest converters for very little money",
        "Measures at the top of its class in blind tests",
        "Globally certified manufacturing behind the line",
        "Four preamps and four outputs for the money of a 2-channel rival",
        "Blind testing regularly shows budget UMC series units measuring far closer to expensive interfaces than the price gap suggests"
      ],
      "cons": [
        "QC lottery means unit-to-unit variance",
        "Thinner long-term driver attention",
        "Rough build and drivers compared to its rivals",
        "Cheap four-channel unit with a documented Hi-Z hardware flaw and objective tests showing it sounds way worse than comparable interfaces"
      ],
      "citations": 4,
      "distinctOutlets": 4,
      "thinlySourced": false,
      "flaggedToAvoid": {
        "runs": 1,
        "ofRuns": 4
      },
      "image": "https://stspimgdevmfyk46r5vwkay.blob.core.windows.net/images/products/behringer-umc404hd.webp"
    },
    {
      "rank": 9,
      "tier": "C",
      "lp": 488,
      "name": "Universal Audio Apollo Twin X",
      "brand": "Universal Audio",
      "slug": "universal-audio-apollo-twin-x",
      "url": "https://stierproducts.com/products/universal-audio-apollo-twin-x",
      "verdict": "Excellent hardware kept current for years, but the DSP ecosystem adds software dependency that pure-driver rivals avoid.",
      "pros": [
        "Superb build and converters",
        "UA has kept the Twin platform current for years",
        "Genuinely excellent conversion quality",
        "Recommended by Guitar World as the best interface for guitar overall",
        "Guitar World's top overall pick for guitar"
      ],
      "cons": [
        "DSP ecosystem adds software dependency that pure-driver interfaces avoid",
        "Its flagship price largely buys DSP and Unison modeling that native plugins have largely made unnecessary",
        "Its endorsement is aimed at players already committed to the UAD plugin ecosystem",
        "Dependence on the UAD software ecosystem adds a layer of ownership risk",
        "Thunderbolt-only connection"
      ],
      "citations": 3,
      "distinctOutlets": 3,
      "thinlySourced": false,
      "flaggedToAvoid": {
        "runs": 3,
        "ofRuns": 12
      },
      "image": "https://stspimgdevmfyk46r5vwkay.blob.core.windows.net/images/products/universal-audio-apollo-twin-x.webp"
    },
    {
      "rank": 10,
      "tier": "C",
      "lp": 399,
      "name": "LEWITT Connect 2",
      "brand": "LEWITT",
      "slug": "lewitt-connect-2",
      "url": "https://stierproducts.com/products/lewitt-connect-2",
      "verdict": "Objectively one of the two strongest entry interfaces per the ASR community, with modern features the Scarlett Solo lacks. Just misses the Solo's price.",
      "pros": [
        "Big preamp gain at an entry price",
        "Clear metering and loopback included",
        "Treated as one of the two objectively strongest entry-level interfaces by the Audio Science Review community",
        "One of two leading candidates stepping up from budget Scarlett",
        "Modern, well-measured alternative highlighted by measurement community"
      ],
      "citations": 1,
      "distinctOutlets": 1,
      "thinlySourced": true,
      "image": "https://stspimgdevmfyk46r5vwkay.blob.core.windows.net/images/products/lewitt-connect-2.webp"
    },
    {
      "rank": 11,
      "tier": "D",
      "lp": 333,
      "name": "Focusrite Scarlett Solo 4th Gen",
      "brand": "Focusrite",
      "slug": "focusrite-scarlett-solo-4th-gen",
      "url": "https://stierproducts.com/products/focusrite-scarlett-solo-4th-gen",
      "verdict": "One preamp is a ceiling you hit fast, and the 2i2 4th Gen removes it for modestly more. Buy the Focusrite Scarlett 2i2 4th Gen instead.",
      "pros": [
        "Included in Audio Science Review's blind tests of budget interfaces",
        "The 4th Gen gave the Solo the converter and gain upgrades",
        "A default first-interface recommendation in the home recording community",
        "Blind testing shows budget Scarletts performing far better than their price class suggests",
        "Current-generation starter unit"
      ],
      "cons": [
        "Only one preamp and one instrument input",
        "A capability ceiling you hit in year one",
        "Resale value collapses accordingly",
        "Single combo input is a hard ceiling the 2i2 removes for a small step up",
        "Lacks second input and flexibility of 2i2"
      ],
      "citations": 1,
      "distinctOutlets": 1,
      "thinlySourced": true,
      "flaggedToAvoid": {
        "runs": 3,
        "ofRuns": 8
      },
      "image": "https://stspimgdevmfyk46r5vwkay.blob.core.windows.net/images/products/focusrite-scarlett-solo-4th-gen.webp"
    },
    {
      "rank": 12,
      "tier": "D",
      "lp": 329,
      "name": "Universal Audio Apollo x8p Gen 2",
      "brand": "Universal Audio",
      "slug": "universal-audio-apollo-x8p-gen-2",
      "url": "https://stierproducts.com/products/universal-audio-apollo-x8p-gen-2",
      "verdict": "A current-generation pro rack unit that Production Expert names directly among the best in its class, with UA's established driver track record behind it.",
      "pros": [
        "Current-generation pro rack unit",
        "Named directly among the best in its class by Production Expert",
        "Backed by Universal Audio's established driver track record",
        "Eight premium Unison preamps",
        "Excellent for users needing eight high-quality preamps"
      ],
      "cons": [
        "Higher price reduces value-per-dollar compared with other picks",
        "A UA brand premium is baked into every channel",
        "too new to have long-term reliability data",
        "Still a premium purchase"
      ],
      "citations": 1,
      "distinctOutlets": 1,
      "thinlySourced": true,
      "image": "https://stspimgdevmfyk46r5vwkay.blob.core.windows.net/images/products/universal-audio-apollo-x8p-gen-2.webp"
    },
    {
      "rank": 13,
      "tier": "D",
      "lp": 289,
      "name": "Audient iD14 MkII",
      "brand": "Audient",
      "slug": "audient-id14-mkii",
      "url": "https://stierproducts.com/products/audient-id14-mkii",
      "verdict": "Ranked #9 based on series-level praise for sound quality, though roundups mention its siblings more often than this specific model.",
      "pros": [
        "Excellent sound quality",
        "Praised preamps from the series crowned best-sounding in a cost-no-object discussion",
        "Same measured performance as the iD4 MkII",
        "Extra inputs and outputs over the iD4 MkII"
      ],
      "cons": [
        "The iD4 MkII delivers most of the same preamp character for less",
        "less documentation than sibling models",
        "Performance identical to the cheaper iD4 MkII, so the extra cost buys only additional I/O",
        "Marketed with hype that outpaces its practical advantage"
      ],
      "citations": 1,
      "distinctOutlets": 1,
      "thinlySourced": true,
      "flaggedToAvoid": {
        "runs": 1,
        "ofRuns": 5
      },
      "image": "https://stspimgdevmfyk46r5vwkay.blob.core.windows.net/images/products/audient-id14-mkii.webp"
    },
    {
      "rank": 14,
      "tier": "D",
      "lp": 241,
      "name": "Universal Audio Apollo X4",
      "brand": "Universal Audio",
      "slug": "universal-audio-apollo-x4",
      "url": "https://stierproducts.com/products/universal-audio-apollo-x4",
      "verdict": "Positioned ninth as the natural four-channel step up within the Apollo premium family, endorsed by Guitar World as part of the overall Apollo line.",
      "pros": [
        "Natural four-channel step up within premium family",
        "Author uses X4 as larger version of recommended Apollo line",
        "superb converters",
        "solid build quality",
        "active Gen 2 platform"
      ],
      "cons": [
        "Lacks direct review evidence",
        "less accumulated failure-rate history than older generations"
      ],
      "citations": 2,
      "distinctOutlets": 2,
      "thinlySourced": false,
      "image": "https://stspimgdevmfyk46r5vwkay.blob.core.windows.net/images/products/universal-audio-apollo-x4.webp"
    },
    {
      "rank": 15,
      "tier": "F",
      "lp": 120,
      "name": "Behringer UMC204HD",
      "brand": "Behringer",
      "slug": "behringer-umc204hd",
      "url": "https://stierproducts.com/products/behringer-umc204hd",
      "verdict": "It measures brilliantly for its class, but unit-to-unit consistency and long-term driver cadence make it the weakest ownership bet among the picks, which is why it sits under the superseded Scarlett.",
      "pros": [
        "Measures far above its station in blind tests",
        "The cheapest board-worthy way into recording",
        "Certified manufacturing behind the line's price-to-performance case",
        "High-value compact interface",
        "Great sound with low noise floor"
      ],
      "cons": [
        "Main output level reported low by an owner",
        "Outclassed by the MOTU M2 in direct comparison",
        "Brand's long-term driver and support reputation is the weakest of any brand here",
        "No longer recommended by current expert guides",
        "Bare-bones software and build"
      ],
      "citations": 3,
      "distinctOutlets": 3,
      "thinlySourced": false,
      "flaggedToAvoid": {
        "runs": 5,
        "ofRuns": 10
      },
      "image": "https://stspimgdevmfyk46r5vwkay.blob.core.windows.net/images/products/behringer-umc204hd.webp"
    }
  ]
}