You can connect a bluetooth transmitter to the headphone jack. This one allows for more than one speakers so might be useful http/www.avantree.com/product-bluetooth-audio-transmitter-avantree-priva-985.html
When you connect the transmitter it will cut off the TV speakers. Start with the TV volume low and bring the volume up slowly to avoid overloading the input of the transmitter. This would product a distorted sound regardless of the playback volume of the speaker.