An innovation that truly bridges the gap between multi-room audio and home theater. With the VDA51 in-line in a zone, a pair of in-wall or ceiling speaker becomes a surround-sound theater through Dolby Virtual surround. The VDA51 takes a digital S/PDIF output and delivers analog audio with virtual surround to any zone. The perfect solution for master bedrooms and family rooms, where the theater surround experience is desirable but five speakers are not. When a Dolby Digital stream is present, the unit encodes the analog output with Dolby Virtual® Speaker surround information which creates a virtual surround effect from only two in-wall or ceiling speakers. Dolby Virtual fine tuning selector lets the installer choose Wide or Reference decoding (each setting a different level of surround processing and perceived surround effect).