In my home built Visaton Casablanca IV I made several improvements already, changed from passive to active, replaced reflextubes with passive resonator, changed original Visaton tweeter against Visaton ribbon tweeter, Changed places of tweeter and midranger, changed woofer several times with finally a Visaton woofer with best figures for me, but the only speaker I didn't change was the Visaton Dome midrange speaker, due to the fact that I couldn't find a replacement dome speaker that fits in the same hole and with better figures. I changed the cross over frequency between mid and high from 6500 Hz to 5000 Hz, that was a small improvement. Together with ChatGPT I searched for a solution and found Morel EM1308. I changed the original midranger against Morel EM 1308 and WOW, so much improvement. Voices sound much more natural, percussion is so much better, no distortion and sharp sounding anymore. I recommend this Morel speaker to anybody.