I’d look at properly applying DSP functionality in products like Roon or miniDSP to help adjust for room acoustics. Adjusting for room acoustics addresses the root cause and allows all the music to come through cleaner and better at all volumes.
Most impactful for playing soft
Hi, my system is primaluna evo 300 separates with b&w 702 signature speakers. I normally play music from a blue sound streamer through a ps audio nuwave dac. When I play my system loud it sounds great to me, but when I play it at volumes my wife can deal with it sounds a bit thin. What single upgrade would people recommend in order to most directly address this low volume problem. I listen to heavy metal, r&b, rap and jazz for the most part.