After all, second-hand goods, it is inevitable there will be some, "An Bing," and, similar products on the market was mixed, and this requires that owners carefully choose the. Compared to the secondary host, second-hand car audio speakers easier to identify, usually through the naked eye can distinguish good and bad. Because it is difficult to carry out renovation, so by watching the appearance of Car Audio speakers do not wear the tray is left broken, there are no signs of flooding, basically you can tell it's good or bad, but also through the observation car stereo speakers cleanliness to determine the age of the car stereo speakers. If there is damage to the phenomenon, generally affect its service life.

For hosts, the difficulty of identifying the good and bad is much higher. In addition to regular visual inspection, such as the screws are not removed traces of panel keys have no scratches, no appearance of discoloration, etc., should also be tested on the host site, listen. At the same time remind the owners, if you really need to buy professional loudspeaker, be sure to consult with the owner before you buy whether the warranty is good, how many months the warranty and other issues, in order to avoid future problems and unnecessary disputes.