I just saw this thread...nice to see an "audio" related topic. Well I read the first 10 posts or so...maybe you guys have hit the nail on the head already....but I thought I'd just give you guys word of what floats around in the sound engineering industry I'm part of. First off, if you're going to use mp3 as your playback media, check into LAME's encoder. LAME, as well as some Fraunhoffer releases, do a pretty good job at nullifying undesired data via VBR (specifically in low volume and low complexity of data areas). 256 bitrate should be your minimum cut.
If you're serious about your audio, however, and have a decent system, you should be listening through wav/aiff format. Even though a good mp3 encoder will cut out frequencies that the human ear cannot detect (usually a good encoder starts at 20-25khz for highs/25-15hz for lows) those cut-out frequencies do alter frequencies in our hearing range (read up on your sonic properties). With the lower frequency it's even more of a issue, because even though humans theoretically can't hear below 25hz (this level is still not confirmed) we still can FEEL this movement of air...thus it adds to the sensation of the track. Sonic waves not only give us hearing sensation, but actual physical sensation. So it's important that the frequency range be as large as possible.
And to those who say people can't tell the difference between 160 and 256 and 320...well you're ignorant to the technology readily available (not a bad thing by any means). In my home studio, the base playback system I'm running is Genelec 1031A monitors/Apogee AD8000SE 8-channel A/D D/A converter/Yamaha 02R Digital mixer...and I'm quite easily able to tell difference between 160 and 256 and so on. 128kbs is simply terrible...dynamic range and sonic maximization is slaughtered. MP3 really doesnt exist in the pro audio world as we only accept wav or higher quality files when a client comes in to have a track mastered/mixed/etc. Even though the average joe does not need a system like engineers like myself run, it's vital for us to be able to work with the greatest dynamics and fidelity possible so we can make better mixes for you guys listening through Klipsh Promedias on your PC or Sony X-plodes in your cars... etc etc.
FYI, the recording standard in today's industry is 24bit/48khz...with 96khz starting to eek its way in (esp because of DVD). So you can see why audio engineers get so frustrated that they have to bounce their beautiful work at 24bit/48 & 96khz down to a measly 16bit/44khz for CD
Workin': 1380? The math is right, but that figure is not realistic. This spec varies because of a number of things: 1. CD dye 2. Laser accuracy of CD-R 3. Encode/Decode processes and a few more technical aspects that are really not worth getting into. BTW, you come across as a flaming as*hole...congrats.
Well that's my 2 cents.