ABX Double Blind Test Results: CD Players & DA Converters
PSACS Test Results
| CD Players | Result | Correct | p less than |
|---|---|---|---|
| Sony CDP-707 ESD vs. Phillips CD100 (14-bit) |  |
73 / 109 = 67% | 0.0005 |
| Sony CDP-707 EST vs. Panasonic SLS-295 (portable) |  |
25 / 48 = 52% | 0.443 |
| DA Converters | Result | Correct | p less than |
|---|---|---|---|
| Audio Alchemy DDE Version 3.0 vs. Marantz CD-63 | |
20 / 40 = 50% | - |
| The tests were conducted in a same/different protocol. |
| The Phillips CD-100 was serial number 345, the first CD player in the US and only 14-bit. The Sony CDP-707 uses 18-bit technology while the Panasonic SLS-295 uses 1-bit technology. These tests were published in PSACS Sound Bytes Vol. 7 No. 1 (Oct 96) |
| The Audio Alchemy DDE Version 3.0 DA converter was driven from the digital outputs of the Marantz CD-63. The same/different comparison was between the DDE's outputs and the Marantz analog outputs, however the analog signal was put through another AD-DA conversion in a Marantz CDR-610 in record mode. This was done for level matching. The comparison was single blind same/different with listeners moved out of the room for cable changes. |
Send questions or comments on the PSACS tests to Tom Nousaine.
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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.