I was listening to Metallica’s Black Album, System of a Down - Toxicity and High on Fire -Blessed Black Wings on my LS50W today. They blew me away as usual! I really recommend a sub though, for metal.
I was running mine at volume 70 (Out of 100) with volume levelling on -14 LUFS, and was getting 90dB at my sofa, so… definitely loud enough!
My room is 7 metres long by 3 1/2 metres wide. My speakers fire across the width of the room, so across the narrow part of a rectangle.
I sit about 2 1/2 metres away from each speaker.
If you set them up correctly, the sound completely envelops you.
I use a touch of Roon PEQ with mine because I like a slightly scooped mid range and a bit of a warmer bass, so I boost 80Hz and below by 3dB and reduce 1 and 3 KHz by 2dB.
This may be needed because of the effects of my room. But that’s the great thing about Roon DSP, you can tweak these things until you get a sound you like. (Within reason. You’ve got to make sure you don’t overdo it with EQ)
I also up-sample everything to the Kefs’ maximum sample rate (24/192) as this gives me a slightly smoother sound, more akin to analogue.
The LS50W take a good few hours to run in and can have a more sharp sound out of the box, but they mellow up quite a bit after a couple of hours and get much better after 24 or so.