
Things tend to get more interesting under pressure but under compression bad things start to happen. Technically, compression does generally not pose a problem for diver's (not counting partial pressure problems) - it's the decompression that screws up things. The same thing holds true for
MP3 players (notice the nice little 180 I did there, now we're on the subject of
MP3 players). Compression makes neat little packages of large .
wav files which then can be decoded by
MP3 players. Unfortunately most compressions are
lossy (
MPEG-1 Audio Layer 3 for instance, commonly
refered to as just "
MP3" which technically speaking is to general of a term to provide any
usefull information), chopping away parts of the original sound file. I think we all can agree that below 192
kbps good songs go bad, and if you're listening to your music with headphones - Very bad. At 192
kbps and above (beware of crappy
VBR ripps though) there should be no added noise, clicks or distortion but
MP3 files are by their nature
lossy and a fair amount if information is trimmed from the song in favour of a smaller file size. Cheap/bundled headphones usually helps to distort the clarity of the music which makes small imperfections hard to hear since the headphones lack the definition to accurately reproduce minute details of sound. With most middle-end-and-up headphones the sound opens up greatly which adds depth and detail to the sound quality but also brings out the imperfections. There are basically two ways to prevent compression related audio problems - either compress the songs in a very high
bitrate or don't compress the songs at all (there's also a third option in between the two,
lossless compression). Most people prefer to compress their music since the idea of a single file weighing in at 34MB for a 3:24 long song seems excessive (P.O.D. - "Alive" in case you were wondering). However compression removes much of the depth and tends to make songs sound more "flat". It's hard to explain but it sounds like the instruments and the singer kind of melts together at the edges, the boarder between the two is somehow faded and muddled. There's also generally speaking a sensation of listening to music in front of you rather then around you with compressed songs - hard to explain, but hopefully that makes sense to someone. This also makes a huge difference in immersion for me, I get pulled into the songs to a much higher degree. Granted, the difference is usually only observed when listening to non-compressed songs - but once you go uncompressed it's hard to go back.
I did a little test on my
iPod Shuffle. I uploaded two versions of "Alive", one in 192
kbps .
mp3 (4,7MB) and the other in 1411
kbps uncompressed .
wav (34,2MB). I sat down in my sofa and started with the 192
kbps version. It sounded alright, I was hard-pressed to find something to really complain about although something just didn't sound right during the busiest parts of the song and the singing felt a little bit flat. Then I moved on to the uncompressed song. Wow... It was like a veil had been lifted from the song. The bass was well defined, deep and controlled, the singing was detailed, precise and very clear. Again this is very hard to articulate, you have to hear the difference for yourself. As 192
kbps it a fairly low
bitrate, I made a third version of the song - ripping it with
iTunes in 360
kbps AAC. This version was virtually indistinguishable from the 192
kbps in my ears, both had that flat-
ish sound to them. The sound of the uncompressed song was so much clearer so much... Just "more" I guess. The bass was lower, the singing were higher and the cymbals were razor sharp. I redid the test with
Nightwish - "Feel for you", one file in .
wav and the other in 256
kbps MPEG-1 Audio Layer 3. This time I shuffled the songs on the Shuffle so I didn't know which was .
wav and which was .mp3. As I listened to the first version of "Feel for you" on the
playlist my first guess was .
wav, but wasn't sure just yet. After 30 seconds I knew, if this wasn't .
wav it was the best compressed song I've ever heard. I connected the Shuffle to the PC, and sure
enought - the first version was the uncompressed file. Unfortunately I was unable to test the
Apple Lossless Audio Codec (ALAC) (a reportedly
lossless codec, which reduces the file size with 40 to 60%) since the Shuffle does not support this format.

The bottom line;
MP3 players with suitable headphones can really get a boost from uncompressed or
lossless compressed files, but even with
lossless compression files will get considerably larger then your ordinary
lossy MP3 file. Unfortunately people in general are surprisingly unconcerned with sound quality considering the money they payed for their
MP3 players. The trend today has drifted
MP3 players from "Music Player" to "Mediocre Multimedia Center". Apparently every
MP3 player must have a minute color display and a hand full of crappy puzzle games to appease the general public. Here's an idea; Since a
MP3 players due to it's relative size and capacity is unfit to be anything more then a music player - why not make a music player? Strip away all the crap and make the best
MP3 player ever. Apple was close with the
iPod Shuffle, although the omission of
ALAC does not make sense and even I understand that the general public demands a screen. The cold hard fact is that a portable
MP3 player in any role other then as a music player will be a half-
assed compromise. Retailers sell Mediocre Multimedia Center player on the sheer "wow" factor of their additional and unnecessary functions - not sound quality. Consumption at it's worst, "If the consumer doesn't know what he wants, sell something flashy with a lot of gimmicks". And some of the reviewers are not helping either,
Appleinsider actually wrote a six (6!) page online review about the 3G
Nano, without a single comment about sound quality. None. It's not even mentioned in the final
pros/cons roundup - "
volume" was mentioned once, but that's as close as they got. They wrote, and I quote; "
The biggest annoyance with the new Nano is the games compatibility issue". What the...! Who cares, it's supposed to play music - and judging from your review it's
anyone's guess how well it even does that! According to
CNET Asia the sound quality of the 3G
Nano "
still sounds just middle-of-the-road" in case you were wondering.
Labels: audio, mp3, rant, rant-ish(?)