Originally Posted by pilgrimpete
When I was testing speaker configurations at the weekend (added 4 Dolby-enabled Atmos speakers), I noticed that when playing 2-channel music from Spotify/Pandora/AirPlay, the Dolby Surround Upmix would send audio to all 11 speakers but only one of my sub-woofers was waking up and I assume playing it's channel - the other one had the red light on at the back, suggesting it was not receiving any audio and was remaining in power-save mode.
They two sub's are identical and plugged into their own sub pre-out but I'm assuming that for some reason, music only uses or requires one of the subs to be operating. I notice that they both wake up if I send a DTS/Atmos demo file or play a Blu-ray disc so I'm confident it is by design.
Is there an audio-science explanation for it?
I'm pretty sure both of my systems with dual subs, one with a 5100 and the other with a 3070 output sound to both of the subs when in Dolby Surround decode mode (which I mostly use). I have my subs set in stereo mode. I'll check to confirm that tonight.
1) JVC DLA-NX7 & Sony 65Z9D, Yamaha CX-A5200, Outlaw Audio 7900 & 7700, UDP-203, DP-UB9000, UBP-X800M2, Roku Ultra
2) Sony 75Z9D, Yamaha RX-A3080, 2xOutlaw Audio 2200s, UDP-203, UBP-X800M2, Roku Ultra
3) Sony 75X940E, Yamaha RX-A2080, UDP-203, UBP-X800M2, Roku Ultra