Want to know whether the speaker can work normally, use 1.5V dry battery. The anode of the battery is connected to the red terminal of the speaker, and the cathode of the battery is in intermittent contact with the black terminal of the speaker. At the moment of contact, the speaker will have a "bang". According to my experience, according to this "bang" sound, I can initially know how the sound quality of the speaker is. If the bang is low at the moment of contact, it means the bass of the speaker.
To use this speaker normally, you must have a power amplifier. There are two pairs of terminals behind the power amplifier, two pairs of red and two pairs of black. It is clear which one is the same as which one. If there is no sound by mistake, the red end of the power amplifier is connected to the red end of the speaker and the black end is connected to the black end of the speaker. When testing, first adjust the volume to the minimum, and then slowly increase it, otherwise it will easily burn out the speaker. The audio input of the power amplifier depends on the equipment you use. You can buy the connecting cable you need by telling your boss where there are computer accessories.
I also like to play speaker amplifier, I hope my advice will help you.