Odd missing vocals?

It may be a frequency range that is a null point in your room. Try listening up very close to the speaker and see if it's coming out but disappearing as you move away. 

Google AI search:

trouble with Midrange vocals missing on Bluesound Node

Missing or recessed midrange vocals on a Bluesound Node can often be resolved by adjusting settings within the BluOS app, particularly by disabling "

Audio Clock Trim," tweaking tone controls, or ensuring proper input/output settings. Users have noted that sometimes a "cold" or "flat" sound profile can be adjusted by reducing sub-bass or using external DACs for better vocal presence. 

Here are specific troubleshooting steps based on user reports:

• Toggle Audio Clock Trim: Go to Settings > Player > Audio > Audio Clock Trim in the BluOS app and try toggling this setting, as it can affect timing precision and, in some cases, the midrange presentation.
• Adjust Tone Controls: Some users report that activating tone controls (Bass/Treble) can significantly change the sound character, sometimes flattening it; experiment with these to boost the midrange (or lower the bass to reduce masking).
• Fix Output Level: If using an external DAC, set the Output Level to "Fixed" to ensure the Node isn’t altering the signal.
• Power Cycle: Unplug the Bluesound Node from power for at least 30 seconds to force a cache clear, or perform a factory reset if issues persist.

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Ok, just back home in Chicago from the NYC snowmageddon! I tried reversing the polarity on one speaker, then the other, but still had the odd missing vocals. On a whim, I reversed the left and right outputs. Viola! The music is full range and the missing vocals appeared! It doesn’t really make sense (does it?) but I’ll leave well enough alone. 
Thanks for the suggestions, all.