DFF vs SND
A detailed comparison of DSD Interchange File and NeXT Sound — file size, quality, compatibility, and which format to choose for your workflow.
DSD Interchange File
Audio FilesDFF (DSDIFF - DSD Interchange File Format) is the original file format for DSD audio data, developed by Philips. Unlike DSF, it uses a chunked IFF structure and is the native format for many professional DSD recording systems.
About DFF filesNeXT Sound
Audio FilesSND (NeXT Sound) is an audio file format originating from NeXT computers and later adopted by Sun Microsystems as the AU format. It stores audio with a simple header and supports various encodings from 8-bit mu-law to 32-bit floating point.
About SND filesStrengths Comparison
DFF Strengths
- SACD-native format.
- Supported by high-end DACs.
- Bit-exact DSD preservation.
SND Strengths
- Historical NeXT archive format.
- Compatible with Sun AU.
- Simple header structure.
Limitations
DFF Limitations
- No metadata support.
- Huge files (2-6 GB album).
- Niche audiophile market.
- Specialized decoder hardware needed.
SND Limitations
- Legacy — no new content.
- Ambiguous — NeXT .snd and Mac .snd are different formats.
- Requires specialized tooling for Mac resource-fork variant.
Technical Specifications
| Specification | DFF | SND |
|---|---|---|
| MIME type | audio/x-dff | audio/basic |
| Extension | .dff | .snd |
| Sample rate | 2.8224 MHz (DSD64), 5.6448 (DSD128) | — |
| Creator | Philips | — |
| Sibling | .dsf | — |
| NeXT variant | — | Identical to Sun AU |
| Mac variant | — | HFS resource fork format |
Typical File Sizes
DFF
- Full SACD album (DSD64) 2-4 GB
- DSD128 album 4-8 GB
SND
- NeXT System alert 5-50 KB
Ready to convert?
Convert between DFF and SND online, free, and without installing anything. Encrypted upload, automatic deletion after 2 hours.
Frequently Asked Questions
DFF (DSD Interchange File) is an audio file format used to store sound recordings — music, voice, podcasts, sound effects. The format defines how the audio samples are compressed (or stored raw), what bitrates are supported, and how metadata such as title, artist, album, and cover art is embedded. It is part of the audio files family.
SND (NeXT Sound) is an audio file format used to store sound recordings — music, voice, podcasts, sound effects. The format defines how the audio samples are compressed (or stored raw), what bitrates are supported, and how metadata such as title, artist, album, and cover art is embedded. It is part of the audio files family.
VLC, foobar2000, and the default media players on Windows and macOS handle DFF natively. On mobile, iOS Music and Android media apps vary in their support — popular formats work everywhere; niche ones may need a dedicated app. If playback fails on a device, converting to MP3 or AAC usually solves it.
VLC, foobar2000, and the default media players on Windows and macOS handle SND natively. On mobile, iOS Music and Android media apps vary in their support — popular formats work everywhere; niche ones may need a dedicated app. If playback fails on a device, converting to MP3 or AAC usually solves it.
Upload the DFF to KaijuConverter and pick MP3, WAV, FLAC, AAC, OGG, or any other target. Our FFmpeg pipeline decodes the audio and re-encodes to the target format at sensible default bitrates (VBR ~190 kbps for music, 96 kbps for speech). Metadata and cover art travel with the audio where both formats support them.
DFF can be lossy or lossless depending on the specific variant. Lossy variants (smaller files) discard some audio detail during compression in ways tuned to be inaudible; lossless variants preserve every sample exactly but produce larger files. For distribution, lossy at high bitrate is standard; for archival, lossless wins.