iTunes - Sound Quality and Music File Formats
By Simon Dawson
If you care about the sound quality or transferability of you music archive, you’ll want to investigate the various import options. These allow you to weigh up the size of the imported music files against the fidelity of the sound and the degree to which they’ll be compatible with software and hardware other than iTunes and the iPod. This article focuses on importing from CD, but the advice applies equally to files you’ve downloaded or created yourself.
Importing Options
To access the iTunes’ Importing options, open Preferences (from the iTunes menu on Mac; from the Edit menu on PC) and click on the Importing tab at the top. The two most important options are those in drop downs. They allow you to choose which file format/compression type to use, and the bitrate. If you’re not sure what a file or bitrate is, read on.
Which Format
iTunes currently offers five file-format import options: AAC, MP3, AIFF, Apple Lossless and WAV. If any of these don’t appear in your list of options, you’re probably running an old version of iTunes. Download and install the latest version.
In brief, AAC is best for day to day iPod and computer use; MP3 is slightly worse at the bitrate, but can be played on any digital music player or computer (and burned onto MP3 CD); Apple Lossless is for fidelity fanatics; and AIFF and WAV are only really for importing tracks with the aim of burning CDs.
Note that all file formats can be burned to audio CDs and played back in normal hi-fis - it’s only when sharing actual music files with non-iTunes or non-iPod equipment that compatibility becomes an issue.
Which Bitrate?
The bitrate is the amount of data that each second of sound is reduced to. The higher the bitrate, the higher the sound quality, but also the more disk space the track takes up. The relationship between file size and bitrate is basically proportional, but the same isn’t true of sound quality, so a 128 Kbps track takes half as much space as the same track recorded at 256 Kbps, but the sound will be only very marginally different. Still, marginal differences are what being a hi-fi obsessive is all about.
The default import setting in recent versions of iTunes, listed as “high quality”, is AAC at 128 Kbps. Most people will be perfectly satisfied with this combination (which is usually said to be roughly equivalent to MP3 at 160 Kbps), but if you’re into your sound in a serious way it may not be quite good enough. Particularly if you listen to high-fidelity recordings of acoustic instruments, such as well recorded classical music, and if you connect your iPod or computer to a decent home stereo, you may find AAC 128 Kbps leads to a distinct lack of presence and brightness in your favourite recordings. If so, either opt for the Apple Lossless Encoder or stick with AAC and up the bitrate. The best thing to do is to run a comparative experiment with a suitably well-recorded track.
Simon has been writing articles for nearly 2 years. Come visit his latest website at http://1cupcoffeemaker.info/commercial-espresso-machines/ which helps people find the best information on commercial espresso machines.
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