Voices coming through soundbar after I turn off tv

I had a problem years ago with bleed in from my neighbors CB radio.  My system was off but it was picked up by the speaker cables and came out through my Dahlquist DQ10's!  Grounded coaxial speaker cables fixed the problem.  

I would guess you have a cell phone coming through and it happens after turn off when the power supplies still have some juice in them.  I suggest you install a good power line filter if you don't have one and make sure your equipment is grounded properly.  This means checking the earth line and neutral line all the way back to your distribution panel.  

I doubt it is Bluetooth since that is a secure channel connection and what you have is a relative powerful bleed through. 

Thanks, I have 2 Furmans with all my gear plugged into them. Only the TV/soundbar is doing this. Very odd.

I had a Rega integrated that did that and it was sound coming through from my DAC.

Never figured it out, gave the Rega to a neighborhood kid though.

If it is only the soundbar creating the problem, try this - Put a 0.00001 to 0.001uFd COG/NPO capacitor across the speaker terminals with a voltage rating of 100V or more.   You can get a one from DigiKey, Newark, or Mouser.  If it is a RF bleed in, that might just kill it.  If the soundbar is powered internally, then this trick won't work. 

I hope you don't have a little blonde daughter named Carol-Anne, as this might speak to a more spiritual issue at hand.

Do you have a separate audio connection coming from the Xfinity box or other device such as Apple or Amazon TV going to the soundbar directly? This could potentially cause somewhat of a similar symptom as those devices are not turned off unless powered down. Alternatively, the system is picking up a stray signal from somewhere. Cell phone towers, cell phones, old school analog handheld wireless phones, baby monitors, Wii-fi video surveillance systems with microphone, wireless or Bluetooth doorbells with outdoor microphones, etc.