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DSD, PCM & bit-exact, explained.

High-resolution audio is buried under jargon and marketing. These are plain-English, technically honest guides — what's real, what's hype, and what it means for listening on an iPhone.

Start with DSD vs PCM DSD on iPhone

What this is

1-bit is a bit-exact DSD & PCM player for iPhone and iPad. Building it meant getting deep into how digital audio actually works — so this is where we write that down, plainly.

No format tribalism, no golden-ear mysticism. Where DSD genuinely helps, we'll say so; where the difference is marketing rather than physics, we'll say that too. The goal is that you finish each guide understanding your own music a little better — whether or not you ever install our app.

New to all this? Read them in order, starting with DSD vs PCM. Already know the theory and just want sound out of your iPhone? Jump to DSD on iPhone & iPad.

Foundations

Start here. The physics and the vocabulary, without the marketing.

DSD vs PCM

Two ways to digitise sound — a fine amplitude grid versus a 1-bit pulse-density stream. What actually differs, and the honest verdict on which sounds better.

What "bit-exact" means

Why your computer or phone quietly alters audio — and why, for DSD, a single stray decibel turns music into a blast of damaging white noise.

DoP vs native DSD

The two ways a DSD stream reaches your DAC. Why DoP wraps DSD in PCM packets, why that isn’t lossy, and which one you’re actually using.

On iPhone

The part almost nobody explains properly.

How to play DSD on iPhone & iPad

Apple Music and Files can’t do it. Here’s exactly what you need — a bit-exact player, a USB DAC, and DoP — and how to set it up with 1-bit.

Which USB DACs work on iPhone

How 1-bit sends DSD over DoP to a USB DAC, what to check before you buy, and a model-by-model matrix — Chord, iFi, FiiO, Topping, Questyle and more (and the popular DACs that are PCM-only).

Choosing & sourcing

Where DSD fits next to a streaming subscription, and how to build a library.

DSD vs streaming

Qobuz, Tidal, and Apple Music all stream PCM — none stream DSD. Why that is, where each one wins, and how a local library complements them.

Do higher DSD rates matter?

DSD64 to DSD512: what climbing the rates actually changes, where the returns diminish, and why content availability matters more than the number.

.dsf vs .dff vs SACD ISO

The three DSD containers — which carry tags and art, how DST compression and multichannel fit in, and which to keep.

Where to buy DSD music

The download stores worth knowing, how to spot native DSD versus PCM-upsampled releases, and free tracks to test your setup.

The honest take

No tribalism — the evidence, the trade-offs, and what really drives the sound.

Is DSD really better?

What blind tests actually show, the engineering case against 1-bit, the genuine case for DSD, and why people hear differences that aren’t the format.

The studio myth

Why “pure DSD” is rare: you can’t mix in 1-bit, so studios work in DXD and convert. What that means for the music you buy.

Inside your DAC

Why “native DSD” on the box rarely means a pure 1-bit path — how ESS, AKM, and R2R designs really handle the stream.

Hear it for yourself

Bit-exact DSD & PCM, in your pocket.

1-bit plays your DSD and PCM files untouched on iPhone and iPad — no resampling, no transcoding, no account. The theory in these guides, working in your hands.

Get 1-bit on the App Store Stream your home library