I use Pulsar 2, and had been running them on a PrimaLuna Evo400i.
now so moved to Feliks Envy preamp into a Benchmark AHB2 power amp.
I believe they moved up to a whole other level in precision, especially bass, imaging, instrument separation, everything sounds better. Due to their low sensitivity Joseph speakers require a lot of power and I believe, while your A50 will make them sing nicely, you might feel the bass a bit lose.
I’ve tried many speakers, Klipsch Heritage line, Tannoy Cheviot, Piega, Dynaudio, Dali, but the pulsars driven properly were the most amazing for me.
they need to fire down the long wall, they have huge energy, though if the short wall is long enough it would probably work as well. Positioning is key, they need space behind and from the side walls.
Someone I know moved from Harbeth to Pulsars and they are most satisfied.
cheers