I want to ask how to connect the TV amplifier.

A TV headset (usually a 3.5 socket) or an audio output interface (lotus connector) can be connected to a set of audio inputs (usually two lotus heads) of a power amplifier.

The red squares in the picture are the audio inputs of the TV amplifier. Therefore, if the audio source is from the TV headset, you can buy a connecting cable (one is a 3.5 plug and the other is two shower heads). When I bought it, I said I wanted to connect a computer and a power amplifier. If the TV outputs audio (many TVs don't), you can buy two audio cables with shower heads at both ends.