ABX Double Blind Test Results: Analog Tape Generations
SMWTMS ABX Test Results
| 1/4" 2-track 15 IPS tape generation losses | Result | Correct | p less than | Listeners |
|---|---|---|---|---|
| Original vs. 1st copy (2nd generation) |  |
193 / 340 = 57% | 0.007 | 6 |
| Original vs. 3rd copy (4th generation) | |
58 / 78 = 74% | 0.0005 | 7 |
| The 1/4" 2-track 15 IPS tape generation losses were heard on JBL 4412's. The tape recorders were Otari MTR-10 and Otari MTR-20 synchronized with SMPTE Time Code. |
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The different symbol means it is unlikely the percent correct score occurred by chance and thus the null hypothesis was disproven, which substantiates a real difference in sound quality. |
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The same symbol means that it is likely the correct score occurred by chance, the null hypothesis is not rejected, which means no difference was found. It does remain possible a difference may be substantianted with further testing. |
Send questions or comments on the ABX Web Page to David Carlstrom.