However, don’t get sucked in by the term ‘wireless.’
Those speakers might not be as wireless as you expect.
What a Loudspeaker Needs to Create Sound
A loudspeaker needs two types of signals so that work.

Bang & Olufsen
The transmitter sends the music/movie soundtrack information to a speaker or secondary amplifier that has a built-in wireless receiver.
However, another connection is needed to complete the process power.
This means that the speaker still has to be physically attached to a power source and an amplifier.

Lifewire / Vin Ganapathy
The surround speakers are then connected by wire to the second amplifier module in the back of the room.
You haven’t eliminated any wires, you’ve just relocated where they go.
This can limit speaker placement as the distance from an available AC power outlet becomes a major concern.

Vizio/Amazon
You may still need a rather long AC power cord if a convenient AC outlet is not nearby.
The subwoofer sends surround sound signals to two surround sound speakers via physical speaker wire connections.
Control is provided via compatible smartphones.

Image provided by Sonos
One Play-Fi wireless-surround sound speaker-enabled soundbar is the Polk Audio SB-1 Plus.
Denon has added a wireless surround sound speaker option to itsHEOS wireless multiroom audio system.
Sonos, Play-Fi, Heos, and MusicCast are all closed systems.

Polk Audio
This means that their wireless speaker products can’t be mixed across platforms.
Adding a wireless receiver to a subwoofer does not require a major redesign cost.
The home theater receiver, through a wireless transmitter, sends the low-frequency impulses to the wireless subwoofer.

Klipsch
The subwoofer’s built-in amplifier produces the power required to allow you to hear the sound.
One example of a wireless subwoofer is theKlipsch R-10SWI.
Here are some examples.

Enclave Audio
Beginning with the 2019 model year, select LG OLED and UHD TVs are WiSA-ready.
The speakers pair with a Roku TV over a secure wireless web connection.
They can’t be used with other branded TVs, audio systems, or Roku boxes/streaming sticks.

Damson
However, they provide a convenient wireless speaker option for improving the sound for Roku TVs.
Just keep in mind that the speakers need to be plugged into power.
Just keep in mind what speakers require to produce sound when you shop for wireless speaker options.

Roku