I'd go straight to fw 10.1.0 and load SAM for the LS50 Meta. If you do not enjoy that a KC62 sub (or two) should do it. If using a subwoofer SAM should be left off as there is no independent line out on the 120 and you must use the speaker level input on the sub. There used to be a SubPreOut board option for the 120. Maybe your 120 have the board installed?
*
Devialetless!
Roon or LMS/brutefir/DietPi_x86_64
piCorePlayer/ISORegen/HeadStreamer/Yamaha HP-1
250 Pro CI, MicroRendu, Mutec MC-3+USB
Devialetless!
Roon or LMS/brutefir/DietPi_x86_64
piCorePlayer/ISORegen/HeadStreamer/Yamaha HP-1
250 Pro CI, MicroRendu, Mutec MC-3+USB

