What did Devialet use

[Hifi_swlon]

I guess it’s really down to the key individuals and their expertise and also the technology available at the time. Seems kit like the audio precision is commonplace and I’m sure some companies have custom kit doing similar or better. I don’t think whether we can measure more accurately than we can hear us in question, but that doesn’t mean everyone could just get an AP and design the best kit known to man - you still have to know what to measure and what things make a difference.

I guess many designers are from an earlier era.

But we wouldn’t have walked on the moon by trial and error alone.