Double blink test on AAC 256 K v ALAC
Mar 27, 2008 at 1:34 AM Thread Starter Post #1 of 7


100+ Head-Fier
Nov 6, 2007
I used itunes and simply encoded a lossless file to AAC256 and searched for them so as I'd have no idea which was which. I kept thinking I was hearing things differently then realised I was playing the same version and hadn't hit the back key twice. Talk about placebo affect. In the end I really decided I could hear more body in Ian Anderson's voice on one particular track. Turned out to be the bloody AAC! To my mind what this proves is 1)The quality of the AAC codec 2) The poor quality of my dac. 3) A headphone test might not reveal imaging detail loss like a speaker test (of course this is a good argument for the use of lossy compression on portable devices)
In my mind it's still worth ripping to lossless for the sake of scalability and peace of mind.
Mar 27, 2008 at 1:37 AM Post #2 of 7
Well, a few things I got to say here.

1.) It's DBT; Double Blind Test, not 'blink.'

2.) foobar2000 is the proper way to do it!

3.) Indeed, some have said it's easier to distinguish lossy from lossless on speakers more than headphones.
Mar 27, 2008 at 11:40 AM Post #5 of 7
And Comment #2 was addressing the fact that iTunes does not have a built in method of blind testing. Foobar2000 allows you to ABX two tracks in a truly blind fashion, and after a number of trials gives you the probability that you are guessing. It has nothing to do with being bit perfect or not.
Mar 27, 2008 at 3:54 PM Post #7 of 7
Do a real ABX test, then pick either lossy or lossless depending on the result.
No questions asked AAC at 256Kbps are high quality, and you might have a hard time hearing any audible difference against ALAC.

Users who are viewing this thread