From my personal experience I can only confirm that Lowthers are shouty.
Nevertheless, SET amp tames that down to acceptable levels. I used 15 Ohm Lowther DX2 in home-made Fidelio enclosures for quite some time before I wanted a change, and I still hesitate to let them go as they were very good at some things. Shouty, yes, even with 300B SET. They were basically useless with solid state, that includes Pass Aleph 4. My room is bigger (around 20’ by 23’ with large openings), with solid state amps there was no bass.
Nevertheless, SET amp tames that down to acceptable levels. I used 15 Ohm Lowther DX2 in home-made Fidelio enclosures for quite some time before I wanted a change, and I still hesitate to let them go as they were very good at some things. Shouty, yes, even with 300B SET. They were basically useless with solid state, that includes Pass Aleph 4. My room is bigger (around 20’ by 23’ with large openings), with solid state amps there was no bass.