what is soo unique about LS3/5A? Is it the crossover which makes much of the difference?

Had a pair for a while. Lack of volume and dynamics was the deal breaker for me, not the bass. Excellent violin tone and very nice voices. Impossible to play many genres, so ultimately limiting the musical scope. Great for people with tiny rooms or cranky neighbours.
 
Looking at the fan following of the Ls3/5a why is it soo famous? The crossover also doesnt look like conventional 2nd order or 4th order.

What is this all about? It could be some BBC standard ok then so what? what makes the sound soo special?

As main speakers for a room they are special in not being designed to be used for this purpose. They were designed for close monitoring in small reflective spaces at sound levels below what would be required for mixing/serious listening. Initially that is what they were used for but for reasons I don't know they were adopted in the 80s by the "flat earth" subjective movement in the UK with all sorts of subjective goodness being projected onto them. There will be a story here involving personalities and reviews but I don't know it. Hopefully others more familiar with those times in the UK can chip in. This is where the enthusiasm for the speakers originates and it involves subjective audiophiles so looking for technical explanations is likely to be fruitless.
 
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