ABX Double Blind Test Results: Digital
SMWTMS ABX Test Results
| Digital Audio Comparison | Result | Correct | p less than | Listeners |
|---|---|---|---|---|
| Ampex 16 Bit Delay Line vs. wire |  |
87 / 160 = 54% | 0.3 | 10 |
| The Ampex 16 Bit Digital Delay Line vs. wire comparison was heard in a recording studio control room on time aligned UREI 813 speakers with McIntosh MC-2100 amplifiers. The audio source was a master 2-track 15 IPS tape on a Scully 280. This master tape had been mixed from a 24-track master tape on an Ampex MM-1000. The mixdown and playback was through an API console. The listeners included professional recording engineers with years of experience on major label projects, professional maintenance engineers, and recording engineering students.. For those not familiar with studio equipment, these are some of the most revered pieces of equipment of that day. API consoles are still prized today for their high quality. |
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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. |
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David Carlstrom
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