Gregm:
YOU WERE RIGHT, "LSA is a brand name used by "DK Designs" who is now LSA Group and LS3-5a is the code name of a '60s BBC spkr design for monitoring inside recording vans".
LSA is in no way affiliated with any of the BBC licensed LS35as. I was just making the point that the LS35as are still around and in addition to their use in recording vans they are a classic reference quality nearfield home speaker.
By way of comparison only, I feel the DK Design LSA2s have a palpable, uncolored midband sonic character similar to LS35as (BBC Monitors), and a smooth sweet extended quality to the treble that reminds me of Avant Gardes. The primary difference is that they can jump jive and rock(perhaps in the way of an Audio Physic but with a warmer, bass reflex kind of sound). I'll also restate the fact that rather than "brutally revealing the weaknesses in the audio chain and source material" they seem to be very forgiving of the source and make everything you hear through them sound good. I'd be curious to know why this is.
Gregm, I apologize if I confused the issue earlier, your initial post to this thread was indeed correct.