You can play around with either 80 or 70 Htz. The frequency response for LS50 falls pretty fast around 60 htz (as per Stereophile's measurement). You can also play around with foam port plug for ls50.
Oppo-203 / SonicTransporter i7 Roon Core ->Trinnov Altitute-16->TAD M2500MK-1 -> TAD CR-1