1, the line left by the sound is the network cable. See how many wires are connected to the power amplifier or computer, and then consider combining the network cables of the same color, such as orange, orange-white, green, green-white, blue-blue, white, brown and white. Try to use one set if possible, because the diameter of the network cable is small and the current is large (large), which will cause problems.

2, acoustics: refers to the sound that the human body can feel. Including human voice (also known as vocal music), instrumental music and effects (natural sounds or sounds imitating nature). Devices that record, process, transmit, amplify and play the above audio are called audio devices. Including: recording equipment, post-processing equipment, working carrier (magnetic tape, CD-ROM, floppy disk, hard disk, etc. ), data signal acquisition equipment (turntable), digital-to-analog conversion equipment (decoder), sound card, peripheral equipment (including limiter, effector, equalizer, processor, etc. ), power amplifier, speaker (speaker, speaker) mixer, etc.