What Is Audio Quality?

Why "quality" is hard to pin down

People talk about audio quality as if it's a single dial — higher is better. In practice, it's more like five or six independent dials, each measuring something different. You can have a recording with excellent frequency response but a terrible noise floor. You can have a file with a high bitrate that contains a source recording of poor quality.

The question "is this good quality audio?" has layers. Are you asking about the recording? The editing? The encoding? The playback hardware? All of these contribute to what you ultimately hear, and problems at any stage can undermine quality introduced at every other stage.

The factors that actually determine quality

Frequency response

A high-quality recording captures the full audible frequency range accurately — from the sub-bass below 60 Hz to the airy highs above 12 kHz — without exaggerating or cutting any part of it. A cheap microphone may roll off above 8 kHz. An overloaded preamp may add harmonic distortion. A poorly configured codec may cut the top end at high bitrates.

When people describe recordings as "thin," "bassy," "bright," or "muffled," they're describing frequency response imbalances. EQ can adjust frequency balance, but it can't restore frequencies that were never captured.

Dynamic range

Dynamic range is the ratio between the quietest and loudest sounds in an audio recording. CD-quality audio (16-bit) has a theoretical dynamic range of 96 dB — far more than you need for any practical listening scenario. Professional recording at 24-bit extends this to 144 dB — again, far beyond what's necessary.

The quality concern with dynamic range arises not from the format, but from heavy compression and limiting applied during production. Over-compressed audio sounds "squashed" — there's no room between soft and loud. The music loses its natural breathing quality. Streaming platforms' loudness normalisation has helped reverse some of the damage done by the loudness wars era.

Noise floor

The noise floor is the level of background noise present in the signal when nothing is being recorded. It manifests as hiss, hum, or room ambience. A low noise floor is desirable — the quieter the background, the more dynamic range the signal has.

Bit depth affects the noise floor of a digital recording — 16-bit has a theoretical noise floor of around -96 dBFS; 24-bit drops it to -144 dBFS. In practice, the room, microphone, and preamp introduce far more noise than the bit depth adds, making the bit depth advantage largely theoretical for most recording situations.

What format choices can and cannot do

Choosing a lossless format (WAV, FLAC) preserves the quality of whatever was recorded. It introduces no additional degradation. But it can't improve source material. A FLAC of a muffled recording is a muffled recording — just accurately preserved.

A high-bitrate lossy format (320 kbps MP3, 256 kbps AAC) introduces a very small quality reduction — one that most listeners in typical conditions cannot perceive. A low-bitrate lossy format (64 kbps MP3) introduces audible artifacts that genuinely reduce perceptual quality.

The biggest quality determinants are: the recording environment, the microphone, the preamp, the recording levels, and the editing and mixing decisions. Format is the last link in that chain — it can preserve or slightly reduce what came before it, but it cannot compensate for problems introduced earlier.

What audio conversion can and cannot do to quality

When you convert an audio file, the conversion affects encoding artifacts — and nothing else in this list. It doesn't change the recording environment, the microphone, the recording levels, or the editing decisions. Those are permanent properties of the source audio that no conversion can alter.

Converting from a lossless source (WAV, FLAC) to a lossy format (MP3, AAC) introduces a small, deliberate increase in encoding artifacts — the only quality factor a converter directly controls. Done at a reasonable bitrate (192 kbps MP3 or higher), this reduction is below what most people can hear in typical listening conditions.

Converting from a lossy source to a higher-bitrate lossy format doesn't recover quality — it just re-packages the same artifacts in a larger file. Converting any format to lossless preserves exactly what exists in the source. The practical rule: if you care about quality, protect the lossless original. Everything distributable flows from that.