I recieved my s10.3 as well,I calibrated it with my Sony str-dg1000 receiver dcac,volume on sub set at 11'o clock and reciever set internal sub volume @ -4db all sounds sweet.
I'am just playing a ton of music at the moment breaking it in before I let it rip with the movies.
Two songs that make the bass really shine is " Information Society's - Running " and Niki Minaj's - Super Bass....These two songs will tell you if your bass on your subwoofer is properly calibrated..
Sony OLED XBR-65A1E| XBR65X950B|XBR55X900B|2-BR100/Subs|4K X10 Player
Denon - X7200WA|Roku Ultra 4k|PS4
Mirage Omnisat V2 5.1.4 Dolby Atmos set up with SVS PB2000 Sub