I am streaming Spotify from a laptop via usb audio in but I cannot get any sound in the sub. Speakers are set to 5.1 small, sub is on. Analog RCA connection to a Denon 2807. But no sound in the sub. Playing a Cd or watching sat TV via HDMI back is no problem. Then the sub works.
What am I missing ?
^ The Asynchronous USB DAC input accepts only stereo input and passes that DIRECTLY to the DACs -- bypassing any audio processing including bass steering (Crossover processing). Thus the Sub is silent because there is no LFE channel input and no Crossover. Effectively the LF/RF channels are treated as large.
The same thing happens with DSD-Direct-to-Analog conversion as when playing an SACD disc with SACD Output DSD. Unless the SACD includes content in the LFE channel, the Sub will be silent despite speakers set to Small.