That's easy encode castanets.wav with AAC with archive quality and with MPC with --quality 7 or 8. I'm almost sure you'll notice the difference.
Hehe, I can see the difference between them. I followed ff123's guidlines on how to spot pre-echo (here) The MPC has very little pre-echo, and the AAC has it for the same length of time (3ms) but it's a lot louder.
No way could I hear the difference in them! So I made it a bit fairer on me and encoded them in -normal and what's it, -q5. AAC = 185kbs MPC = 193kbs
from ABCH :
ABC/HR Version 0.9b, 30 August 2002
Testname:
1L = C:\X_AUDIO\castanetsaac185.wav
2L = C:\X_AUDIO\castanetsmpc193.wav
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General Comments:
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1R File: C:\X_AUDIO\castanets.wav
1R Rating: 4.9
1R Comment: just a guess!
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2L File: C:\X_AUDIO\castanetsmpc193.wav
2L Rating: 4.0
2L Comment: first 3 single castas sound a bit more reverbey?
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ABX Results: (3.6 -> 6.3 seconds in the file, the reverb and guitar ending)
Original vs C:\X_AUDIO\castanetsaac185.wav
4 out of 5, pval = 0.188
Original vs C:\X_AUDIO\castanetsmpc193.wav
7 out of 11, pval = 0.274
ABX Results: (0.8 -> 1.5 seconds, the 3/4 single casters)
Original vs C:\X_AUDIO\castanetsmpc193.wav
5 out of 10, pval = 0.623
Original vs C:\X_AUDIO\castanetsaac185.wav
3 out of 10, pval = 0.945
ABX Results: (the whole file)
Original vs C:\X_AUDIO\castanetsmpc193.wav
5 out of 10, pval = 0.623
Original vs C:\X_AUDIO\castanetsaac185.wav
5 out of 10, pval = 0.623
Erm... well I think that proves conclusively I can't tell a difference!