I have the TV Streamer 2 plugged into a Toslink-powered splitter via the optical cable connection. The other optical output connector from the splitter runs to a Yamaha amplifier with a 6:1 speaker system. The output volume has been fine for me both with ReSound Quattros and now ReSound Omnias. I listen both through streaming to my HA’s and the room speaker sound input through my external mics and adjust the relative sound balance in the Smart 3D app.