Not heard the Spendor 2/3 specifically, but owned the 3/1 for some time. I’m still kicking myself for ever selling them, at a big loss, as they are the best speaker I’ve owned or demoed, and I’ve heard a lot. The price of chasing perfection eh…
I’d imagine the 2/3 are ‘more of the same’, but with a bit more scale and effortlessness again, albeit requiring a larger room. I’m not sure what size your room is, but the 3/1 were already testing the limits, bass wise, in a 4x4m room. Generally well balanced though.
Assuming the 2/3 is similar to the 3/1, then you can expect great midrange tone, a solid and tuneful bass, loads of (natural) detail, fluid dynamic swings, sweet and silky highs, very non-fatiguing and engaging across a wide range of music, with an invisible crossover between drivers. I suppose the highs are a double edged sword – they make all recordings listenable and sibilance is so well controlled – but some people will want a bit more ‘edge’ and conciseness I suspect, for cymbals and guitars etc. E.g. something like the Proac D2R fits that description, but personally, I found them bright and slightly unnatural in the highs. Neither are the Spendors a fast and nimble speaker, the way ATC are. They’re fluid, textured and rhythmic, but not peppy and dry.
They're open and cohesive sounding, but not sparkly and err a bit towards politeness and hang back slightly. If you think most speakers these days are overly bright and analytical, the Spendors could be just for you.