I have owned the A1, A4, and LS6 speakers. The Graham LS6 provide a sense of natural scale and immersion that just feel much more involving to me; it is a more open and dynamic sound than Spendors and make me want to play loud; the Spendors faded into the background quite nicely with no distractions, which is also something one may want .
I did find the A1s bass shy for some genres (house, reggae, large scale opera) but a rather charming speaker. The A4 produced, by comparison, a great all around unassuming sound with tight actual bass and yet less of the stunning transparency of the Graham and A1 stand mounts. I do find myself applying DSP bass trim in Roon for the Grahams as they are seated near a wall. If you’re willing to go that route, and listen in a medium size space, the Grahams are end game speakers - rivaling some far, far dearer speakers I own (huge German Physiks and powerful WVL models for use in very large spaces) for sheer enjoyment. Their BBC lineage also makes them strikingly clear relay devices for sonic scale and vocal inflection; it’s not just a cliché.