Can I connect a S/PDIF Optical signal to Quartet's Digital Inputs? Chris April 19, 2021 19:47 Updated Quartet's Optical Inputs only work with ADAT or SMUX devices. They do not accept S/PDIF Optical signals. Related articles Can Quartet lock to an ADAT/SMUX optical clock source? Optical Inputs on Symphony Desktop can accept any sample rate, doesn't care about clock source How to setup Ensemble for Standalone Mode How to setup multiple speaker sets with Quartet How do I use Symphony Desktop's Optical I/O to expand input channels? Comments 0 comments Article is closed for comments.