American brands, now basically large-scale stage stereos are JBL, but some of them sell dog meat. What you can see is the JBL logo on the surface. I'm playing a wedding. In the past, the wedding warehouse was full of stereos, all of which were JBL, but they all had sound quality. I've been driving for more than ten years, and the car stereo market is even more chaotic. First of all, if you want to replace the original position, you should buy a high-pitched coaxial speaker. The kind of treble and subwoofer with frequency divider. The power cannot exceed 60W, because the maximum output of CD mono is 50W. If you want to upgrade to a higher level, you must add an amplifier. The sound is naturally unparalleled. You should choose the power matching between the speaker and the amplifier. The power amplifier should be greater than the speaker power. Pay attention to the impedance of the power amplifier. In addition, JBL in car stereos is rare, and some of them are fake. You can tell from the packaging. The quality is quite heavy, and the brands are all article numbers. You can check whether it is the same as the genuine product online.