First, check the outer layer of the speaker to see if there are obvious blistering, scratches, warping, etc., whether the seams are neat, and whether some plastic products of the box are rough, such a

First, check the outer layer of the speaker to see if there are obvious blistering, scratches, warping, etc., whether the seams are neat, and whether some plastic products of the box are rough, such as whether the wall of the inverter tube is thick and whether the surface is smooth. . From these subtle details, we can often get a clue of the quality positioning of the whole box. In addition, carefully identify the box material from the panel seams of the speaker. If it cannot be seen from the seams, you can also use your fingers to tap on the wall of the box cavity. If the board is thicker and denser, If it is high, the sound should be deep and without any obvious hollow feeling. Finally, don’t forget to remove the dust cover and take a look at the manufacturing process of the speaker, especially the manufacturing process around the protruding voice coil cover in the middle of the speaker. If it is not well adhered, you can often see traces of glue left behind after it dries. and check whether there are any signs of damage to the screws fixing the speaker. If there are any signs of damage, they were not installed by machine and the quality will definitely be compromised. When testing the sound, adjust the volume button to at least 3 or 4 to see if the power is enough or if there is any distortion. At the same time, feel around the speaker with your hands. If you feel the sound behind the cabinet (except for the box hole), If there is still wind blowing out outside), it means the speaker is not tightly sealed.