What Is Hi-Res Audio and Can You Actually Hear It?

Hi-res audio is defined by the Japan Audio Society as audio that exceeds CD quality — anything above 16-bit/44.1kHz. In practice, it means files or streams at 24-bit/96kHz, 24-bit/192kHz, or even higher. Apple Music, Tidal, Amazon Music, and Qobuz all offer hi-res tiers. But the question that matters isn't "what is it" — it's "can you hear the difference?"

The Numbers, Simplified

Bit depth (16-bit vs 24-bit) determines the dynamic range — the difference between the quietest and loudest sounds. 16-bit provides 96 dB of dynamic range. 24-bit provides 144 dB. In practice, 96 dB exceeds the dynamic range of almost all recorded music (most pop and rock music uses 10-15 dB of dynamic range). The extra bits in 24-bit are primarily useful during recording and mixing, not playback.

Sample rate (44.1kHz vs 96kHz vs 192kHz) determines the highest frequency that can be reproduced. By the Nyquist theorem, a 44.1kHz sample rate reproduces frequencies up to 22.05kHz. Human hearing tops out at 20kHz (less as you age — most adults over 25 can't hear above 17kHz). A 96kHz sample rate reproduces frequencies up to 48kHz, which no human can hear.

What the Science Says

The most rigorous study on this topic is the 2007 AES paper by Meyer and Moran, which found that trained listeners could not reliably distinguish between CD-quality (16/44.1) and hi-res (24/96 or 24/192) audio in double-blind tests. Multiple subsequent studies have confirmed this result.

However, some listeners report hearing differences in non-blind comparisons. This is likely explained by:

1. Expectation bias: When you know you're listening to the "better" version, you perceive it as better
2. Volume differences: Hi-res files are sometimes mastered at slightly different levels. Even a 0.5 dB volume difference is perceived as "better"
3. Different masters: Some hi-res releases are actually different masters with less compression than the standard release, which genuinely sounds better — but the improvement comes from the mastering, not the format

Where Hi-Res Actually Helps

Studio recording and production: 24-bit recording is essential because it provides headroom for editing. When you amplify a quiet passage, the extra bits prevent noise from becoming audible. This is a legitimate professional advantage with no debate.

Archival: Higher resolution preserves more of the original recording for future format conversion. A 24/96 archive can be downsampled to any future format without generation loss.

Headroom for processing: If you apply EQ, room correction, or other digital processing to your audio, starting with a higher bit depth prevents rounding errors from accumulating. The iFi Zen DAC V2 processes audio at 32-bit internally even when playing 16-bit files, which provides this headroom automatically.

The Honest Answer

For the vast majority of listeners, hi-res audio is inaudible compared to CD quality when the same master is used. The upgrade from Spotify's 320 kbps Ogg Vorbis to Apple Music's lossless (16/44.1) is subtle but detectable on good equipment. The further upgrade from lossless to hi-res (24/96+) is essentially undetectable in controlled listening tests.

If you're considering spending money to "hear more detail," invest in better headphones or speakers first. The difference between $50 headphones and $200 headphones is enormous. The difference between CD quality and hi-res on the same headphones is negligible.

Read our DAC buying guide →

Should You Pay for Hi-Res Streaming?

If Apple Music (which includes lossless and hi-res at no extra cost) is available to you, there's no reason not to enable it. You probably won't hear a difference, but it costs nothing extra.

If you're considering switching from Spotify to Tidal or Qobuz specifically for hi-res, save your money. The sound quality difference between Spotify Premium (320 kbps) and lossless streaming is already extremely small. The jump from lossless to hi-res is even smaller.

Spend the subscription difference on better headphones, a basic DAC, or acoustic treatment for your listening room. These investments produce audible improvements that hi-res streaming alone cannot.

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