I remember the pair of JBL 4311 owned by my dad. He drove it with Sansui AU-7900, and often played it loudly, with songs like this and this. No, it wasn't hi-fidelity, not to mention my dad loved to boost the bass using the integrated amp's tone control. But every music he played always sounded very lively Decades later, I tried the same AU-7900 on my JBL 120Ti's. The system sounds more detailed, more accurate, and cymbals are outright beautiful. I would arguably say, driven by the same amplifier, JBL 120Ti's sound better than JBL 4311's. Yet the 120Ti's do not sound as lively as the 4311's. Now I mostly listen to my secondary system in the garage; a pair of JBL L20T's driven by Sansui A40, in nearfield listening position. They sound more detailed than the 120Ti's, perhaps due to the nearfield position. But they do not sound as lively as the JBL 120Ti's. Given the facts that JBL 4311's are 90 dB/w/m, JBL 120Ti's are 89 dB/w/m, and JBL L20T's are 87 dB/w/m, do speaker dynamics increase with sensitivity, or it's just coincidence?