My suggestion would be this $40 Sony DVD player, because it has a coaxial digital output in addition to the analog RCA outputs.

This would give you the option to use the DAC in the Sabaj A4, which is probably better quality than the one in the DVD player.

https://www.amazon.com/Sony-DVPSR510H-Player-HDMI-Upscaling/dp/B007F9XHAY