Thanks to both. Got that and copied to a file to save. I ripped hundreds of CDs so would only choose my favorite classical and jazz to rerip I suspect. So, now buying mp3s, how do we stand, what choices, if any, do we have?
Diane
It really depends on where you get your MP3s from. Because of prior problems (MP3's typcially only available at 128 Kpbs) I figured it was better just to buy the CD's even if I did not want all the songs. I don't know if there is a way to confirm, but probably not worth it at more than 256kpbs compression (320 would be better) unless you don't really care about fidelity - which most people don't because it sounds OK. I again refer to my jpeg analogy - most people are fine with a photo at 1024 x 768 or maybe a bit higher - but it is funny how people want to get a 12 Megapixel camera - which is like 3800 x 2400? or something like that... They don't use the extra information, or don't really care.
So - rip a CD at several different compressions, or even just a favorite song or 2 - do the A/B thing comparing your rip to your CD, and at some point you are going to notice a difference - but its just not that big a deal - right in that range is probably where you want to do your ripping.
For hard rock - which has a lot of distortion anyways - I rip at 160, for jazz, classical, vocals- I rip at 192, sometimes even at 256.
I don't know if Apple has information available what there compression is, or
Amazon - although I think that
Amazon is generally 320 kpbs - just to make things confusing some algorithms are better at compression (AAC) so even though the kpbs is lower, because the compression is better, you get better sound quality at a higher compression rate - like comparing jpeg and Gif with photo compression - jpeg is a better algorithm. Mostly depends on how universal you want your files - MP3 is easy - everything plays it - AAC is Apple - so not everything supports it.
Edit - pulled this info from the Apple site...
What is iTunes Plus?
iTunes Plus is the new standard on iTunes. iTunes Plus downloads are songs and music videos available in our highest quality 256 kbps AAC audio encoding (twice the audio quality of protected music purchases), and without digital rights management (DRM). iTunes Plus music can be burned to CD as many times as you need, synced to any AAC-enabled device (such as iPod, iPhone, or Apple TV), and played on any Mac or Windows computers you own.
How much does iTunes Plus music cost?
iTunes Plus songs are available at one of three price points. In the U.S. the pricing is 0.69 USD, 0.99 USD, or 1.29 USD each. Other countries have similar song price points. Check your country's
iTunes Store for pricing.
Can I upgrade previously purchased music to iTunes Plus?
Yes. Any available upgrades will be shown on the Upgrade to iTunes Plus page. You can upgrade all of your items at once by using the Buy All button. This replaces all eligible previous purchases with iTunes Plus versions of the same items. You can also choose to make individual upgrades by clicking the Buy button to the right of each item. Song upgrades are available for 0.30 USD, video upgrades for 0.60 USD, and albums for 30 percent of the album price. The counter to the right of the "Upgrade to iTunes Plus" link in the Quick Links box will indicate when additional eligible content become available.
They indicate that Apple no longer encodes at 128 kBps, so the quality of the current stuff is actually pretty good. You should be pretty happy with the quality they provide.