The optical fiber decoding board is a computer connected to an amplifier by optical fiber. The amplifier has the optical fiber decoding board you mentioned, which decodes the digital signal transmitted by optical fiber into audio analog signal, and then amplifies and drives the speaker.
It can be understood that some functions of the computer sound card are installed in the power amplifier. Because the decoded analog audio signal is only directly amplified and output on the internal circuit board of the amplifier, the interference and attenuation of this analog audio signal are very small. Compared with the audio cable connected to the amplifier in front of the computer, the fidelity of the signal is higher and the noise is very low.
Finally, there is almost no noise when you listen to the fiber amplifier. As for the richness of sound, it depends on what audio signal source it is. If it's MP3, it doesn't sound different. If you listen to the audio in the game, or blue light, you need at least CD demo, optical fiber and audio cable, which is very different.
People are a very strange thing. If you are used to listening to the sound of the optical fiber decoding board, you will feel uncomfortable when you go back to listen to the wired sound. Ha ha! ~