Hi Pedro, Technology changes all the time. We make an effort to stay at the top of it and we understand you want to make use of your existing equipment. The LS500 handles external audio digitally using HDMI-ARC and as an analog signal via a 3.5mm mini plug. HDMI-ARC is preferred as it offers advantages over optical audio, with the ability to pass higher resolution audio formats like Dolby TrueHD and DTS HD Master Audio. In addition, HDMI-ARC can carry video signals as well, simplifying connectivity. Lastly, HDMI-Link (HDMI-CEC), which is available via the same port, allows device interoperability. You can purchase a digital to analog audio converter. As we do not test third-party devices and cannot guarantee the quality. Regards, Nancy - The Epson Team