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Call Today (908) 953-0555   |  80 Morristown Rd. Bernardsville, NJ 07924   |  Mon. - Fri. 9am - 6pm or by appointment
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Digital Audio - A Quick Guide



Audio File Formats

The way you store you songs (data files) can drastically affect the quality of audio playback. While of a less concern the file type affect how much disk space is required. Audio file formats can be divided into four categories, from best to worst:

  • 1. High Resolution Audio HRA
  • 2. Uncompressed
  • 3. Lossless Compression
  • 4. Lossy compression

There are many formats available. I will focus on the main formats in each category.

High Resolution Audio

HRA can be broken into two categories PCM based with sample rates and word lengths greater that CD’s 44.1 kHz/16-bit and Sony’s Direct Stream Digital (DSD.) DSD files can be DSD-64 or DSD-128

Uncompressed Audio Format

  • ● WAV Waveform Audio File
  • ● AIFF Audio Interchange File Formatted – developed by Apple

Lossless

  • ● FLAC – Free Lossless Audio Codec
  • ● ALAC – Apple Lossless Codec. File extension .aif or .aiff
  • ● WMA-losses – developed by Microsoft

Lossy

  • ● MP3
  • ● AAC3
  • ● WMA3
  • ● MP4 - MPEG-4 Part 14 or MP4 is a digital multimedia format most commonly used to store video and audio. The only official filename extension for MPEG-4 Part 14 files is .mp4, but many have other extensions, most commonly .m4a and .m4p. M4A (audio only) is often compressed using AAC encoding (lossy), but can also be in Apple Lossless format. M4P is a protected format which employs DRM technology to restrict copying.3

Music Management Software:

Mac Based
  • ● iTunes
  • ● Amarra
  • ● Audrivana
  • ● Channel D Pure Music
PC Based
  • ● J River: Media Center
  • ● Foobar 2000

Ways to Acquire Music

  • ● Physical Media: CD or SACD; Blu-ray
  • ● Download: either HRA or lossy
  • ● Stream: lossy compression only

High Resolution Download sites

  • ● 2L
  • ● Blue Coast Records
  • ● Channel Classics Records
  • ● Cybel Records
  • ● Download Now!
  • ● HDTracks.com
  • ● HighResAudio
  • ● iTrax
  • ● NativeDSD
  • ● Premonition Records
  • ● Prostudio Masters
  • ● SuperHirez.com (from Acoustic Sounds)

Sonos Supports the following files

  • ● MP3 (compressed)
  • ● WMA (compressed)
  • ● AAC+(compressed)
  • ● Ogg Vorbis
  • ● Audible (format 4)
  • ● Apple Lossless ALAC
  • ● Flac (lossless)
  • ● WAV (uncompressed)
  • ● AIFF (uncompressed)
  • ● Amazon Cloud

Ripping

If you have a collection of CDs that you want to convert to a digital form I highly recommend TerraSan.com. Please see their website for details.

Summary

Since many people are familiar with and use iTunes as the music management software and Sonos is the leader in multi-room distributed audio. I recommend using ALAC since it can be played by both Apple’s iTunes and Sonos. This gives you excellent playback quality while reducing disk space by 40 – 50%.

Please note for your portable devices that you sync with iTunes you can have iTunes downres (convert) the file so it can all fit on your portable device.

 

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