What Is MQA?
MQA – short for Master Quality Authenticated – is an audio codec and technology platform developed by the British company MQA Ltd. (a subsidiary of Meridian Audio, later operating independently). MQA was designed to solve a specific problem: how to deliver hi-res audio files that are small enough to stream efficiently while preserving the quality of the original studio master recording.
MQA’s signature innovation is a process called “audio origami” or “folding.” It takes a high-resolution audio file (such as 24-bit/192kHz) and folds the extended high-frequency data into the noise floor of a file that is roughly the size of a standard CD-quality FLAC (16-bit/44.1kHz). A compatible decoder then unfolds the data to reconstruct the full hi-res signal. Without a decoder, the folded file still plays as a high-quality standard-resolution file on any device.
MQA generated enormous interest and enormous controversy in the audio world. Its proponents praised it as an elegant solution for hi-res streaming. Its critics accused it of being a proprietary, lossy format disguised as lossless, with a licensing model that imposed costs on hardware manufacturers and ultimately listeners. The company behind MQA entered administration in 2023, and the format’s future has been uncertain since – but it remains present in many devices and streaming catalogs, so understanding it is still worthwhile.
In-Depth
The Problem MQA Tried to Solve
In the early 2010s, hi-res audio streaming faced a real dilemma. A standard CD-quality track (16-bit/44.1kHz FLAC) is roughly 30–40 MB for a typical song. A 24-bit/192kHz hi-res version of the same track can be 150–200 MB. That is a lot of data to stream, especially on mobile networks.
Lossless compression (FLAC, ALAC) reduces file size without sacrificing any data, but it can only compress so much – a 24-bit/192kHz FLAC is still several times larger than a CD-quality one. Lossy compression (like AAC or Ogg Vorbis) can shrink files dramatically, but it permanently discards audio data.
MQA’s pitch was that it could deliver studio master quality in a file roughly the size of a CD-quality FLAC – achieving the streaming efficiency of lossy compression without (it claimed) the quality penalty.
How MQA Folding Works
MQA’s encoding process works in several stages:
Stage 1: Analysis and authentication. The MQA encoder analyzes the original studio master file and creates a “fingerprint” of its provenance. This authentication step is meant to verify that the file traces back to the original studio recording, providing a chain of custody from studio to listener.
Stage 2: Folding. The encoder takes the high-frequency data that extends beyond the CD-quality range (above approximately 22kHz for 44.1kHz sample rates) and “folds” it into the lower bits of the audio signal – specifically, into the least significant bits that normally contain very low-level noise. The resulting file has a sample rate and file size comparable to CD quality (typically delivered as a 44.1kHz or 48kHz FLAC), but it carries encoded hi-res information hidden in the noise floor.
Stage 3: Delivery. The folded MQA file is distributed as a standard FLAC file. Any device can play it as a regular FLAC, and it sounds like a high-quality CD-resolution recording. But MQA-encoded files contain a digital flag that MQA-compatible hardware or software can detect.
MQA Decoding: The Three Playback Scenarios
No MQA decoder (any standard player). The file plays as a standard 16-bit or 24-bit FLAC at 44.1 or 48kHz. Quality is good – comparable to CD or better – but none of the folded hi-res data is unfolded.
Software decoding (first unfold). An MQA-compatible software player (or streaming app) performs the “first unfold,” unpacking the folded data to produce a signal at up to 88.2 or 96kHz sample rate. This is sometimes called “MQA Core” and requires no special hardware – just compatible software.
Full hardware decoding (full unfold). An MQA-compatible DAC performs the complete unfolding, reconstructing the full original sample rate (up to 384kHz). The DAC also applies MQA’s proprietary rendering filter, which MQA claims compensates for the time-domain smearing that conventional digital filters introduce. This full hardware decode is where MQA promises its best quality.
The Authentication Angle
One of MQA’s unique selling points was the “Authenticated” part of its name. Each MQA-encoded file was digitally signed to verify its provenance – proving that the file you are hearing is derived from the original studio master and has not been tampered with. In a world where many “hi-res” releases are actually upsampled from CD masters (or worse), authentication had real value. A blue light on MQA-compatible DACs indicated a fully authenticated, studio-quality decode.
In practice, the authentication feature was appreciated by some and dismissed by others. Critics pointed out that authentication of the source does not guarantee a good master – a poorly mastered recording authenticated by MQA is still poorly mastered.
The Controversy
MQA became one of the most polarizing topics in audiophile circles. The criticisms were substantial:
It is lossy. Independent analyses by audio engineers and measurement enthusiasts demonstrated that MQA encoding is not lossless. The folding process introduces quantization noise and artifacts, and the unfolded output does not bit-perfectly match the original master. MQA disputed these characterizations, arguing that its approach preserves perceptual quality even if it is not bit-perfect. But for an audiophile community that values transparency and measurable accuracy, “lossy but perceptually good” was a hard sell – especially when true lossless FLAC files were also available.
Licensing costs increase hardware prices. Hardware manufacturers had to pay licensing fees to include MQA decoding in their DACs. These costs were passed on to consumers. Critics argued that this created a proprietary tax on audio quality – you had to pay more for your DAC just to decode a format that was being marketed as a streaming convenience, not a quality improvement over free lossless FLAC.
It complicated the streaming landscape. Tidal, the primary streaming service that embraced MQA, used the format for its hi-res “Master” tier. This created confusion: was MQA “Master” quality better than a standard FLAC lossless stream? Was it true hi-res? The answer depended on who you asked and what decoder you had, which frustrated consumers trying to make informed choices.
The “origami” metaphor obscured reality. Critics argued that MQA’s marketing – emphasizing “folding,” “studio master quality,” and “authentication” – was designed to make the technology sound more magical and exclusive than it actually was. The technical reality was a lossy encoding scheme with some clever tricks, wrapped in premium branding.
MQA’s Relationship with Tidal
MQA’s most visible consumer presence was through Tidal’s streaming service. Tidal offered MQA-encoded tracks in its highest quality tier, labeled “Master.” For several years, MQA was the primary way Tidal delivered hi-res content.
However, in a significant shift, Tidal moved away from MQA starting in 2023, transitioning to standard FLAC lossless and hi-res FLAC for its quality tiers. This change was driven by multiple factors: the growing availability of hi-res FLAC content from labels, listener demand for open standards, and the financial difficulties of MQA Ltd. itself.
MQA Ltd.’s Financial Troubles
In 2023, MQA Ltd. entered administration (a form of insolvency proceeding in the UK). The company’s assets and technology were subsequently acquired, and the format’s long-term future became uncertain. As of early 2026, MQA decoding remains functional in devices that already support it, and MQA-encoded files continue to exist in some catalogs. But active development has slowed, and no major new streaming platform has adopted MQA.
MQA vs. Standard Hi-Res FLAC
The simplest comparison:
MQA files are small, streamable, carry authentication metadata, and require a proprietary decoder for full quality. The decoded output is very good but is lossy compared to the original master.
Hi-res FLAC files are larger but mathematically lossless – the decoded output is a bit-perfect copy of the studio master. They require no proprietary hardware or software to decode. Any standard audio player handles FLAC.
DSD files are the other hi-res alternative. DSD uses a completely different encoding method (1-bit sigma-delta) and is native to the SACD format. DSD files are very large and require DSD-compatible DACs for native playback.
With Tidal and other services now offering standard hi-res FLAC, the practical advantage of MQA’s small file size has diminished. Modern streaming infrastructure, improved mobile networks, and larger storage capacities have reduced the urgency of the bandwidth problem MQA was designed to solve.
What MQA Got Right
Despite the controversy, MQA contributed some positive ideas to the audio industry:
- It pushed the conversation about hi-res streaming forward at a time when most services offered only lossy audio.
- The authentication concept – verifying that a file traces back to the studio master – was genuinely valuable, even if imperfectly implemented.
- It forced competing technologies (FLAC, ALAC, and streaming services) to improve and offer true lossless and hi-res options, accelerating the industry’s shift toward higher quality.
How to Choose
1. Know What You Already Have
If you own an MQA-compatible DAC and stream from a service that still offers MQA content, you can continue to enjoy it. The quality is good, and the technology works as advertised within its design parameters. There is no need to discard MQA hardware – it decodes other formats just as well.
2. For New Purchases, Prioritize Open Standards
If you are buying a new DAC or choosing a streaming service today, MQA support should not be a deciding factor. The industry has clearly moved toward standard lossless FLAC and hi-res FLAC as the preferred delivery formats. These are open, non-proprietary, bit-perfect, and supported by every major streaming service and hardware manufacturer. Choose a DAC based on its sound quality, features, and build – not on whether it decodes a format whose future is uncertain.
3. Focus on the Music, Not the Format Wars
The quality differences between MQA at full decode, hi-res FLAC, and even well-encoded standard-resolution FLAC are smaller than audiophile forums might lead you to believe. Your headphones, your room acoustics (for speakers), and the quality of the original mastering have far more impact on what you hear than the delivery format. Listen to music you love in the best quality your setup supports, and do not lose sleep over which encoding scheme is delivering it.
The Bottom Line
MQA was an ambitious attempt to solve the hi-res streaming problem with a clever compression technique and a chain-of-custody authentication system. It succeeded in pushing the industry forward and bringing hi-res awareness to mainstream streaming. But its proprietary nature, lossy encoding, licensing costs, and the financial collapse of MQA Ltd. have left it in an uncertain position. The audio world has largely moved on to standard lossless and hi-res FLAC – formats that are open, transparent, and bit-perfect. If you already have MQA-compatible gear, it still works and sounds good. If you are building a new system, your attention (and budget) is better spent on a great DAC, great headphones, and a lossless streaming subscription.