help me to install aux output/line out

[myke_lng]

i have a small karaoke player by bigasuo, i want a convertion to make. i need to intall aux output on it in order for me to connect it to an amplifier. it doesnt support aux output. it uses two LTK5112 ic as amp, so the output have different negative pole and not a common ground. i am having difficulties on this, anybody can help me or give me an idea? thanks....

 

[HarryA1]

Can you pick a signal off the speakers? Perhaps use a three wire connector-jack that disconnects the speakers when you plug it in.

The grounds at the speakers are required by the simulator.