So I read on socionics.com that irrationals tend to have "softer" emotions, while rationals tend to have "sharper" emotions.
Picking out some intense music, I choose one of my LII 5w4 (MBTI INTP) brother's favorite songs, and compared it to my own SLE 8w7 (MBTI I/ESTP) favorite song. The difference is that of being stabbed with a hot knife (rational) versus entering a room that is sweltering. The rational intensity is more point focussed, while the Irrational intensity is more spread out. Let me know if you can hear what I hear.
LII 5w4 (Rational type)
SLE 8w7 (Irrational Type)
Essentially, the former song seems to only affect 1 point in my body, while the second song feels seems to affect my entire body.