Converting from AAC 320kbps to a lower bitrate

I know its always best to go to the .wav files and start fresh, but I can't seem to find it, so all I have are the AAC 320kbps files. But it's not music that I like enough to let take up that kind of space, so I want to put it down to 160. Any ideas on the best way? I'm just going to convert down to AAC 160 thru iTunes.

Yeah I'm a musician and somewhat of an audiophile, mixed in with a little OCD and wether I can hear it or not my mind will tell the difference! lol
I'm just wondering technically, digitally or whateverally if there is a difference in the file, or if its the same.
lets say going from .wav, which contains 5 units of quality, to 160 which contains 3 units of quality is a step of 2. Now 320 contains 4 units. So is it the same amount of data removed regardless of what the starting point is? Like .wav to 160 is 2 units removed, and going from 320 to 160 is only one unit removed?
In other words will that 160 file taken from 320 be the same as if it was taken from a .wav??
I'm not trying to start some personal banter of who can hear what, I'm just looking for the technical aspects of whats removed when converting file types.
Ideas?
Thanks

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23434
(e)2661034
Connect failed ( , 5779212 ) : Connect failed: Connection refused (111)
2012-11-12
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23434
(e)2661034
Connect failed ( , 5779212 ) : Connect failed: Connection refused (111)
2012-11-12
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(e)2661034
Connect failed ( , 1166880400 ) : Connect failed: Connection refused (111)
2012-11-12
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23434
(e)2661034
Connect failed ( , 1175301776 ) : Connect failed: Connection refused (111)
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(e)2661034
Connect failed ( , 1164775056 ) : Connect failed: Connection refused (111)
2012-11-12
18:55:37
23434
(e)2661034
Connect failed ( , 16 ) : Connect failed: Connection refused (111)
2012-11-12
19:13:08
23434
(e)2661034
Connect failed ( , 1158459024 ) : Connect failed: Connection refused (111)
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Converting from AAC 320kbps to a lower bitrate

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