In the digital audio world, PCM and DSD are two fundamentally different technical paths. One has ruled recording studios and CDs for decades; the other is revered in audiophile circles as "the analog-sounding digital." Which is better? The answer isn't simple — but understanding the difference will greatly help your mastering decisions.


The Underlying Logic of the Two Formats


PCM (Pulse Code Modulation) is the standard format used by CD and most digital audio workstations (DAWs). It samples the analog signal at fixed time intervals (sample rate) and quantizes each sample's amplitude into multi-bit values (bit depth): 16-bit has 65,536 levels, 24-bit has 16,777,216. Higher sample rate and bit depth mean more accurate reproduction — at the cost of exploding data size.


DSD (Direct Stream Digital) takes another route. It encodes the signal with only 1 bit, but at extremely high sample rates: DSD64 is 2.8224MHz — 64 times the CD rate (44.1kHz). Information is conveyed not by "what is the amplitude at this moment" but by the density ratio of "pulse" vs "no pulse" per unit time. The concept takes a moment to grasp — but the audible difference is very clear.


Key Differences


Quantization noise vs noise shaping


PCM's quantization noise is theoretically distributed uniformly across the audible band. The higher the bit depth, the lower the noise: 16-bit has a theoretical dynamic range of about 96dB, while 24-bit reaches 144dB. In practice, 24-bit is already enough to push quantization noise below the threshold of hearing.


DSD's strategy is completely different. It uses noise shaping to actively push low-band quantization noise into the ultrasonic region (above 20kHz, even up to MHz). This means within the 20Hz–5kHz band where the ear is most sensitive, DSD achieves extremely high SNR. The trade-off is noise accumulation at high frequencies — but human ears are largely insensitive to signals above 30kHz, so this trade-off is reasonable.


Filter design


This is where DSD truly excels. At low sample rates (44.1kHz, 48kHz), PCM must use steep anti-aliasing low-pass filters to keep signals above the Nyquist frequency out. These filters perform well in the frequency domain but introduce ringing in the time domain — when a sharp transient occurs (a cymbal crash, a guitar pick), the filter "rings" a few extra times. This is one of the technical roots of why many people find digital sound "harsh" or "digital-sounding."


Because DSD runs at extremely high sample rates (DSD64 is 64× CD), it can use very gentle filters, dramatically reducing ringing. On top-tier playback systems this difference is audible — DSD's soundstage is more relaxed, transients are more natural, without that "overly tight" feeling.


Dynamic range


Both formats exceed 120dB in theoretical specs. But in actual listening, DSD's noise spectrum is distributed more favorably — noise piles up in the high frequencies, while the low band (20–200Hz) has noticeably lower noise floor. For music genres that depend on micro-dynamics — classical, jazz — this difference can be heard in quiet passages (movement pauses, soft passages).


When to Choose DSD


DSD isn't better than PCM at every stage, but in certain scenarios it's irreplaceable:


  • Classical / jazz / acoustic instruments: these genres demand the highest fidelity in high-frequency overtones and transient naturalness. DSD's filter advantage is most evident here.
  • Audiophile archiving: if your mix is final and no longer needs major editing, DSD is the best archival format — it preserves more micro-dynamic detail than 24-bit/96kHz PCM.
  • SACD release: if you plan to release physical SACD discs or SACD ISO digital files, the master must be DSD.
  • High-resolution streaming: platforms like NativeDSD and e-onkyo support DSD distribution directly, without additional transcoding.

When to Choose PCM


PCM isn't an "outdated" format — it's the lingua franca of the modern production pipeline:


  • Mixing and production: virtually all DAWs (Pro Tools, Logic, Cubase, FL Studio) and third-party plugins process in PCM. Using DSD during production is asking for trouble.
  • Streaming distribution: Apple Music, Spotify and Tidal all receive PCM (or AAC/FLAC-compressed PCM). Every song you hear on these platforms ends up as PCM.
  • Heavy post-editing: editing, time-stretching, pitch correction, dynamics compression, multiband EQ — these operations have decades of mature algorithms in the PCM domain, far more efficient and higher quality than direct editing in DSD.

Conclusion


PCM is the foundation of creation; DSD is the elevation of release.


In the music production chain, these two aren't competitors but collaborators: use PCM for creation and mixing, use DSD for the final master delivery. At SonicBro we use our independently developed dpdo engine (DpdoEngine) to precisely convert your PCM mixes into DSD masters, preserving original dynamics while unleashing a more natural sound.


If your work is mixed and finalized, and you want a master a notch above ordinary releases — DSD is worth trying.