I appreciate that you don’t like Stirling speakers ( amongst others ) and look upon the Falcon as the only real LS3/5a.
I have never once even hinted that I don’t like Stirling speakers. My only issue with them is they aren’t LS3/5As, which they very clearly aren’t as they don’t use a T27 or B110.
You accept Falcon’s crossover upgrade ( called Gold Badge ) but you won’t accept Stirling’s crossover upgrade ( the V3 one )
If you read my posts I’ve made it very clear I have real doubts about the Falcon Gold Label speakers still qualifying as an LS3/5A if the crossover and subjective output is different to the standard BBC spec.
An LS3/5A is an exceptionally tightly defined thing. It is a BBC specification, though sadly now is little more than a marketing angle. For a speaker to be an LS3/5A it should be sonically and measurably identical to any other LS3/5A. The whole point of the spec being so tight was if one failed they could match any other LS3/5A from stock to it, e.g. there could be a Spendor on one side, a Rogers on the other of a stereo pair and you’d never know. The Hong Kong guy with a wall full of vintage ones confirms this and states he can’t tell them apart! That is exactly how it should be.
Obviously time has not been kind to these vintage drivers, so now there are on occasion sonic differences to be heard between original examples, even between the left and right unit of a serial matched pair (my 149s drivers had shifted very obviously). That is down to glues ageing, moisture, storage etc, but you really should grasp the original design concept and what that specification actually meant.
PS Again I have nothing against the Stirlings (or Grahams etc) at all. I just view them more as a really nice BBC influenced small speaker like the Harbeth P3ESR or Celef PE1. They aren’t an LS3/5A and I doubt even their maker would suggest their suitability to match orphaned units in a studio context. That is the spec!