Does this soundbar really produce overhead sound?

It has two height channels and decodes Dolby Atmos, so it aims sound upward to reflect off the ceiling. The effect depends on ceiling height and seating position, and it is subtler than a bar with dedicated up-firing drivers and calibration.

Do I need a Dolby Atmos TV to use it?

No. The bar decodes Atmos itself, so a TV that passes Atmos over HDMI or optical works. A TV that only sends stereo still plays, but you lose the height and surround effects.

Can I stream music to it from my phone?

Yes. Bluetooth is built in, so you can pair a phone or tablet and play music without the TV on.

Does it come with a subwoofer?

The 5.1.2 layout includes a subwoofer channel, and Insignia sells this as a complete home theater bar. Check the box contents for whether the subwoofer is wired or wireless before buying.

How does it compare with a Sonos or Samsung Atmos bar?

It covers the same 5.1.2 channel count and Atmos decoding for far less, but premium bars add room calibration, more inputs, better dialogue handling and stronger height effects. Choose this one if Atmos on a budget matters more than polish.

Where should I place it for the best height effect?

Put it at ear height or just below the TV with a flat, reflective ceiling above and no shelving in the way. Height channels work best when the listener sits within the reflected path.