John Curl is wrong! Audio equipment measurements are settled engineering. There are no "unknowns" to be discovered! You could say that audio engineering started back in 1877 with Edison's Talking Cylinder. By the 1930's the foundations of modern audio engineering were in place.
Measurements, A/B testing - TAS discusses why they’re lacking
Great read of:
The Absolute Sound’s Review Methodology: First Principles
I remember John Curl said “We don’t know what to measure..”. Now I know what he’s talking about.
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