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Thanks Julian. I could never grasp string theory, but I gather it may be falling out of fashion? In which case, I'm almost vindicated. I'm currently grappling with Graham's number :)

I happened upon it whilst trying to find a retailer in the UK. I'm an engineer, retired from the BBC, and as a college student I designed a pair of ELS headphones. My interest in these speakers is to hear a pair. I used to own a pair of the first QUAD ELS's, followed by Spendor BC1's and...

I was a little perturbed to read the thread (now closed) regarding diaphragm tension: poor old Beanbag posts a perfectly lucid and valid model of a curved diaphragm under tension, and everyone shouts him down! So I guess there's no point making another attempt using simple mechanics: here’s a...