If you like robust bass, then you’ll love the XA-100.8. They provide a lot more bass than the XA-100.5. I listen to a lot of piano/upright bass jazz duets and vocalist/archtop guitar/upright bass jazz trios. In my opinion, the XA-100.8 threw off the delicate balance of these recordings. If you listen to a lot of rock or large scale classical and jazz, you’ll probably like the bass more.I got the 100.8 expecting them to be more neutral than the Xa 100.5 in the bass. I could not demo either but read somewhere that the newer .8 were more neutral. I needed room treatment to tone down upper bass. So maybe the .5 is better after all. Too late now