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General Asylum General audio topics that don't fit into specific categories. |
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In Reply to: Do measurements matter? - linked article posted by 13th Duke of Wymbourne on January 23, 2015 at 15:39:56:
Quote from a John Curl interview.
Also, we couldn’t use mylar capacitors, which are fairly efficient coupling capacitors. While mylars are fairly efficient from a size and costpoint of view, we realized they have problems with dielectric absorption. I didn’t believe it at first. I was working with Noel Lee and a company called Symmetry. We designed this crossover and I specified these one microfarad Mylar caps. Noel kept saying he could 'hear the caps' and I thought he was crazy. Its performance was better than aluminum or tantalum electrolytics, and I couldn’t measure anything wrong with my Sound Technology distortion analyzer. So what was I to complain about? Finally I stopped measuring and started listening, and I realized that the capacitor did have a fundamental flaw. This is where the ear has it all over test equipment. The test equipment is almost always brought on line to actually measure problems the ear hears. So we’re always working in reverse. If we do hear something and we can’t measure it then we try to find ways to measure what we hear. In the end we invariably find a measurement that matches what the ear hears and it becomes very obvious to everybody.
From pages 15/18 and 16/18
Edits: 01/26/15
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Follow Ups
- An interview with John Curl. - jea48 07:32:50 01/26/15 (3)
- Measurements matter whenever it's convenient - geoffkait 10:45:11 01/26/15 (2)
- RE: Measurements matter whenever it's convenient - Ugly 20:19:06 01/30/15 (0)
- Agree. - jea48 06:54:20 01/27/15 (0)
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