Hi-fi dealers will even sell you a special CD or vinyl disc to run-in your speakers.

Don't know if there is any music on these or just "sounds" ranging from low to high frequency.

This topic has been moved to DCC.

https://www.ngaugeforum.co.uk/SMFN/index.php?topic=63546.0

You will find the same sorts of conversations about wines, whiskies, tobacco, cheese, art, probably TVs as well. Are there differences/ improvements? Yes. Can most people appreciate them? No. Does it matter? No. Do you appreciate a £30 wine more than a £10 wine enough to justify the expense? The same applies to high end music systems.

Like any component with moving parts things need to settle in.  I can imagine the diaphragm and the glue which secures it will stretch and soften a tiny amount at first.  Demo speakers and headphones in a shop have probably been through such "running-in"
 
Whether anyone really can tell the difference I don't know - I think a lot of it is audiophiles trying to justify themselves and their supposed expertise/opinion.   

A freshly made speaker will have a tight suspension, but before it leaves the factory, it will be tested and the suspension will have settled in 2 or 3 seconds.
In my youth I could hear getting on for 20khz. Nowadays, I'm lucky if the tinnitus allows me to hear 10khz. I used to have expensive Quad hifi, but now I use a Sony compact system.

I'm going with the myth theory.

I have never heard of this before! In you shoes I would take a cynical view of this claim unless I could find some, what I considered to be unbiased, evidence. My son-in-law is a sound engineer, so I will ask him his opinion as I'm now curious.
Cheers

No Aurora Australis (although it was visible at Kiama, apparently. Kiama is not far south of here), but there was a nice moony at the bus stop last night.



Incidental to this, I called into the newsagent, and they had MRJ #300 in there, Some great pics of Chris Pendleton's layout in there. In the snow.

I have a feeling you didn't find that.

What a coincidence - I found one in my back garden too.

When they say over £1,000 the current price for one of these is over £1,800, makes N look cheap.