Any speakers that you are trying to interface with a digital audio output from a computer would have internal D/A conversion and would be actively amplified.
Although there are pairs of computer speakers / multimedia monitors that have optical and/or coaxial S/PDIF digital audio inputs or USB inputs, the only speaker systems I have seen that could accept an HDMI audio input are single, fairly wide soundbar TV speakers (with or without subwoofer).
Why do you need to interface with HDMI? If you prefer a conventional pair of left and right speakers rather than a soundbar, do you not have either an S/PDIF digital audio output or USB port available on your computer?
Steve