An RCA connector is maybe the most frequently used electrical cable to carry analog audio and video signals.

RCA (Phono) Connector The plug's 1/8" by 5/16" prong connects the signal wire. The outer shell is ground, which connects to the sheath that wraps around the signal wire.

The RCA Cable Was Initially One Connector The RCA connector was introduced in the 1930s by the Radio Corporation of America (hence the name).

If your coax cable is RG-6/59 you can also just terminate with the standard F connector and use an adaptor from that to RCA.

If you connect the left and right positive RCA connections to the positive speaker output and connect all the grounds together you are risking damaging the TV.