Hi Naah_H,
SMSL is USB-C to SPDI/F converter so it suits your system very well (feels like SMSL rep here now lol). It uses probably one of best sound chips on the market (AK4493).
S.M.S.L PO100, PO100 PRO & PO100 AK Measurements Hey folks, It is time for my very last review of the year. A very special one, as there are three products to be measured today ! S.M.S.L released earlier this year the PO100, a tiny and fairly cheap USB to S/PDIF interface. Later in 2022...
www.audiosciencereview.com
All you need is quality digital cable - don't save on it, they do make big difference.
I bet you will be surprised how much sound will improve.
If you're not sure if it will improve, get it, test it and return if don't like. But I'm sure you'll bring new life to Logitech equipment.
EDIT: just double check if your speakers will take Optical Cable. If you can use COAX - its better than Optical so will use that, If not good RCA will do the job.