Reddit reviews ViewHD Dolby Digital/DTS 5.1CH Digital Audio to 6 CH RCA Analog Audio or 2CH Stereo RCA Analog Audio (5.1CH Digital Audio Decoder with Built-in USB AV Media Player | VHD-51CAD
We found 2 Reddit comments about ViewHD Dolby Digital/DTS 5.1CH Digital Audio to 6 CH RCA Analog Audio or 2CH Stereo RCA Analog Audio (5.1CH Digital Audio Decoder with Built-in USB AV Media Player | VHD-51CAD. Here are the top ones, ranked by their Reddit score.
Audio Outputs: 5.1CH / 6 RAC Analog Audio Outputs; use a USB drive to access the setup menu to configure the decoder for 5.1CH to 2CH application.One AV RAC Video Output to Support On Screen Display, Setting and the Bonus: an Integrated and Basic USB Media PlayerAV Video Output Format can be either NTSC or PAL, programmable through OSDPackage Includes: VHD-51CAD Decoder, Remote Control, 100V - 240V AC to DC 5V1A Universal Power Adapter and User Manual; please always contact the seller for technical support.This is a Dolby Digital /DTS 5.1CH digital audio to 6 Channel Analog Audio or 2CH Stereo Analog Audio Decoder.; it supports three inputs: Three Digital Audio Inputs: Toslink Optical Audio Input, Coaxial Digital Audio Input, or USB Inputs for USB Disk / DriveIt has an RCA AV video output to provide OSD to program this decoder. To use this decoder as a 5.1Ch to Stereo decoder or 6 Channel Analog output to receiver: connect a USB drive to the USB input, select the USB input, push the setup button on the remote, select the speaker icon, select "Downmix" option, select "Stereo" option to set the decoder output to be analog stereo; or select the "5.1 Channel" option to output 6 Channel analog audio for receiver/amplifier application.
cant tell for sure but it seems like your system does not have a surround decoder. you would need a decoder to go from the digital out to 6x Analog out.
something like this:
http://www.amazon.com/ViewHD-Digital-Decoder-Control-Support/dp/B00MSD26TK/
Hah. Well... I tried. Here's another shot:
https://www.amazon.com/ViewHD-TOSLINK-Digital-Optical-Switcher/dp/B00G188Z7A
https://www.amazon.com/ViewHD-Digital-Analog-Decoder-VHD-51CAD/dp/B00MSD26TK
This gets you three optical inputs, DD/DTS decoding, 5.1 analog out, a volume control, and (two) remote control.
No idea about getting these things to Croatia, but like much of the China product at this end of the spectrum there are equivalent (perhaps identical) items sold under many different names.