Apple Lossless vs. AAC 256k - and best way to change

I originally imported all my 1500 cds as Apple lossless files figuring that would give me the best audio quality for playing back through my AppleTV. But I have realized that sometimes my bandwidth is not enough (when other are downloading from their computers in the house) and the playback stutters. I also want to be able to fit more songs on my iphone.
So now I am thinking about re-encoding using AAC 256khz - I do not think I can really hear much difference.
Firstly what are your opinion on the relative quality of AAV vs. Apple Lossless files....
and secondly is it best to re-encode by ripping all my cds again (please say no) or can I just select all the lossless files in itunes and have it convert them all to AAC - and if that is the best way how do it do it....?
Many thanks for your help...

Well, I have the same question. So last night I compared the original CD vs. Apple Lossless vs. AAC 256kbit/s.
And to be honest: I cant really hear a difference between AL & AAC@256.
When I knew which version I was hearing I felt that AL is a bit more clear in the highrange. But when I closed my eyes and asked my girlfriend to randomly pic a quality, I only guessed right in 6 out of 10 trys. So I guess I cant tell the difference.
My heaphones are Audio Technica: http://www.audio-technica.com/cms/headphones/e69d047fa2f50ad9/index.html
The tested music was electronic/trance & pop/rock.
In case I later start hearing classic music or jazz, I might do this test again.
Kind regards,
Jan
Message was edited by: Jan Riggert

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