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Why wont ABX show a difference?

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I have seen a few posts saying that DBT or ABX in general cannot reveal the differences between various components. In a nutshell (or not :-)!) why is this so? I personally have used an ABX comparator on my PC, which I know is not very scientific, but I could hear the differences between certain things, such as level mismatches, sonic differences in mp3 codecs, and distortion. I also noticed that I could not hear certain things that were supposed to be easily distinguishable by ear.
Any thoughts on this?

Follow Ups:

Re: Thanks for the responses guys! (n/t) - Jerry Parker 20:58:31 11/28/02 (0)
Re: Why wont ABX show a difference? - PabloP 14:54:02 11/28/02 (0)
ALL, and I mean ALL of the reputable evidence shows that you CAN hear in a DBT test - jj 11:23:08 11/28/02 (66)
- Re: ALL, and I mean ALL of the reputable evidence shows that you CAN hear in a DBT test - Jitter_by_Coffee 05:01:17 12/01/02 (41)
  - Look, running multiple subjects who can see, hear, etc, each other - jj 23:33:59 12/01/02 (40)
    - Re: Look, running multiple subjects who can see, hear, etc, each other - Jitter_by_Coffee 06:26:34 12/02/02 (39)
      - So, how many subjects do you run, and how many trials per subject? - jj 07:24:32 12/02/02 (38)
        
        Re: So, how many subjects do you run, and how many trials per subject? - Jitter_by_Coffee 17:27:51 12/02/02 (36)
        
        Well, if you run one subject, and they control the switching... - jj 20:59:20 12/02/02 (35)
        
        Re: Well, if you run one subject, and they control the switching... - Jitter_by_Coffee 13:52:28 12/03/02 (34)
        
        Argumentum ad exhaustion is hardly convincing - jj 18:03:27 12/03/02 (33)
        
        Re: Argumentum ad exhaustion is hardly convincing - Jitter_by_Coffee 06:25:59 12/04/02 (32)
        
        It's called "peer review", Jit - E-Stat 18:00:48 12/04/02 (18)
        
        Re: It's called "peer review", Jit - Jitter_by_Coffee 07:54:26 12/05/02 (17)
        
        Here - E-Stat 09:24:36 12/05/02 (16)
        
        And by all means - Jitter_by_Coffee 11:51:38 12/05/02 (10)
        
        Why bother? - E-Stat 16:28:36 12/05/02 (9)
        
        Re: Why bother? - Jitter_by_Coffee 16:59:32 12/05/02 (8)
        
        It is truly a shame that - E-Stat 20:10:33 12/05/02 (7)
        
        Re: It is truly a shame that - Jitter_by_Coffee 11:50:07 12/06/02 (6)
        
        Re: It is truly a shame that - Jitter_by_Coffee 11:52:01 12/06/02 (5)
        
        Indeed opinions play a part - E-Stat 14:20:55 12/06/02 (4)
        
        Re: Indeed opinions play a part - Jitter_by_Coffee 22:37:10 12/06/02 (3)
        
        Let me refresh you memory - E-Stat 07:26:55 12/07/02 (2)
        
        Re: Let me refresh you memory - Jitter_by_Coffee 06:37:48 12/09/02 (1)
        
        Actually, I was at Disney two weeks ago - E-Stat 11:49:06 12/09/02 (0)
        
        Re: Here - Jitter_by_Coffee 11:47:34 12/05/02 (4)
        
        Re: Here - E-Stat 14:41:06 12/05/02 (3)
        
        Re: Here - Jitter_by_Coffee 16:58:50 12/05/02 (2)
        
        They do so on a regular basis - E-Stat 20:07:34 12/05/02 (1)
        
        Re: They do so on a regular basis - Jitter_by_Coffee 11:48:26 12/06/02 (0)
        
        Your point? You want to claim that your methods are effective.... - jj 09:54:30 12/04/02 (12)
        
        Re: Your point? You want to claim that your methods are effective.... - Jitter_by_Coffee 07:51:01 12/05/02 (11)
        
        Semantic evasion likewise. - jj 15:11:53 12/05/02 (10)
        
        Re: Semantic evasion likewise. - Jitter_by_Coffee 17:16:40 12/05/02 (9)
        
        Let's not let the facts bother you, eh? - jj 19:25:02 12/05/02 (8)
        
        Re: Let's not let the facts bother you, eh? - Jitter_by_Coffee 11:46:59 12/06/02 (7)
        
        Stop creating false positions for me. - jj 23:49:17 12/08/02 (6)
        
        Re: Stop creating false positions for me. - Jitter_by_Coffee 06:31:06 12/09/02 (5)
        
        I guess, once again, you can't deal with the facts... - jj 16:38:53 12/09/02 (4)
        
        Re: I guess, once again, you can't deal with the facts... - Jitter_by_Coffee 07:14:00 12/18/02 (3)
        
        It's time for you to retire from this, and admit you have nothing at hand - jj 17:58:41 12/18/02 (2)
        
        Re: It's time for you to retire from this, and admit you have nothing at hand - Jitter_by_Coffee 05:22:44 12/20/02 (1)
        
        See the CFP above - jj 21:00:26 12/26/02 (0)
        
        I'm curious too - E-Stat 15:35:10 12/02/02 (0)
- And make sure that the signal is not degraded - E-Stat 19:37:58 11/30/02 (10)
  - One ALWAYS must test the test... - jj 23:35:41 12/01/02 (9)
    - I'll answer your question with a question - E-Stat 15:21:03 12/02/02 (3)
      - How could anyone even know the answer to that? - jj 20:58:02 12/02/02 (2)
        
        Reality is where the rubber hits the road - E-Stat 07:49:09 12/03/02 (1)
        
        Re: Reality is where the rubber hits the road - Adi 09:55:32 12/03/02 (0)
    - Re: One ALWAYS must test the test... - Adi 14:22:15 12/02/02 (4)
      - Actually, using control conditions would be better - jj 21:00:10 12/02/02 (3)
        
        Re: Actually, using control conditions would be better - Adi 22:17:46 12/02/02 (2)
        
        You do an ABX test with known controls, Adi... - jj 00:03:32 12/03/02 (1)
        
        Re: You do an ABX test with known controls, Adi... - Adi 05:55:26 12/03/02 (0)
- Re: ALL, and I mean ALL of the reputable evidence shows that you CAN hear in a DBT test - Phil Tower 12:09:02 11/28/02 (12)
  - Err, even some not that splendid ones have shown differences, Phil. - jj 22:42:16 11/28/02 (3)
    - Re: Err, even some not that splendid ones have shown differences, Phil. - Phil Tower 09:07:38 11/29/02 (2)
      - I'm not sure where to start.... - jj 23:57:37 12/01/02 (1)
        
        Re: I'm not sure where to start.... - Phil Tower 05:21:09 12/03/02 (0)
  - Re: ALL, and I mean ALL of the reputable evidence shows that you CAN hear in a DBT test - RGA 19:31:14 11/28/02 (7)
    - Apparently, you enjoy speculating on the obvious! - E-Stat 19:36:50 11/30/02 (5)
      - OK - RGA 17:46:28 12/01/02 (4)
        
        Re: OK - middleground 10:26:26 12/17/02 (0)
        
        Not !! - E-Stat 15:27:41 12/02/02 (2)
        
        Re: Not !! - RGA 17:33:29 12/02/02 (1)
        
        Not !! - E-Stat 20:24:49 12/02/02 (0)
    - I think you answered your own question, yes? - jj 22:43:18 11/28/02 (0)
Re: Why wont ABX show a difference? - john curl 09:59:06 11/28/02 (3)
- Just curious how did they test them?? - Robert Hamel 07:30:10 11/29/02 (2)
  - Re: Just curious how did they test them?? - john curl 10:18:37 11/30/02 (1)
    - Thanks for where to look.nt. - Robert Hamel 15:54:10 11/30/02 (0)
My take! - Granholm 06:22:32 11/28/02 (2)
- Re: My take! - middleground 10:56:17 11/28/02 (1)
  - Re: My take! - Granholm 12:16:47 11/28/02 (0)

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