What format do you use for your iPhone music? MP3 320kbps or AAC 296kbps?

I was wondering if anyone of you guys knew which is better quality? Is the 320kbps MP3 format better than the AAC 256kbps? The AAC takes less space but will i know the difference?

I do 256 mp3 (or 192) … Good trade off with sound vs size.

Technically speaking, a 256kbps AAC audio file is just about as good as a 320kbps MP3 encoding. (So long as the AAC file was created from a lossless source like a CD.) However, under scientific listening tests, people are unable to hear any difference between the two formats at bit rates of 192kbps and above. So even if you created a 320kbps AAC audio file and compared it to a 320kbps MP3, you would hear no audible difference. AAC does not really show any type of audible improvement over MP3 until you start encoding below 128kbps. Going into the lower bitrates, AAC will then show it's audible superiority, since MP3's tend to lose their audio fidelity going below 128kbps.

But otherwise there really is no quality difference between the two formats so long as you encode at 128kbps and above. 192kbps ~ 320kbps is considered near CD quality for both formats.

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