HI Erpexec,
For the TU690T, I would connect the Samsung Soundbar to HDMI in port 2 for eARC and then connect your Blu-Ray Player into HDMI port 1.
The TU690T has 2 HDMI ports, one of which features HDMI ARC support; however, if you’re looking for a TV that supports HDMI eARC and gaming features such as 4K@120fps (FRL), please consider stepping up to the 55” Frame, which supports both features.
~Samsung Advisor