First of all, when comparing the packaging boxes of real and fake products, you can usually see the difference in size. Secondly, because the speaker picture on the fake packaging box is reprinted after scanning the picture on the genuine packaging box, it has obvious grid lines and unnatural colors. Careful reading of the label on the back of a fake speaker can also reveal flaws. The maximum power value and continuous power value marked on the fake speakers are obviously too high. Since the markings on the packaging box of the fakes are usually the same as those on the genuine packaging, the fakes will have the power marking on the label on the back of the speaker and the power marking on the packaging box. Note the self-contradiction. Due to cost constraints, the fake speakers have metal grilles and plastic outer rings that are regular and round. The genuine metal grille is round and lacks an arc, while the plastic outer ring protrudes with a corresponding arc. The two are inlaid together to form a perfect circle. In addition, the fake speaker's "A" trademark is directly fixed on the iron grille, while the genuine speaker's "A" trademark is fixed on the protruding arc of the plastic outer ring mentioned above. Observing the tweeter unit in the center of the speaker, you can see that the genuine product has a pinhole-sized hole in the metal diaphragm in the center, while the fake product does not. On genuine speakers, the locations where the wires pass through the paper cone are fixed with black glue. In fake products, the wires pass through the paper cone without being fixed by black glue. Last but not least, some printed numbers can be found on the back of the steel frame of the genuine speaker, and there are also some raised numbers on the back of the plastic outer ring. The fakes have no numbers on either the speaker steel frame or the plastic outer ring. Based on the above points, you can quickly identify the authenticity of the Alpine SPS-1029S, SPS-1329S, SPS-1629S, SPS-1729S and SPS-6939S series of speakers. The most common model among fake power amplifiers is the MRV-F407. Here are some tips for identifying fakes for this model of power amplifier. There are several adjustment knobs in the upper left corner of the Alpine MRV-F407 power amplifier panel. These knobs should be covered by a lavender transparent plexiglass plate. The cover of fake products is usually colorless and transparent. There are three indicator lights on the right side of the Alpine MRV-F407 power amplifier panel, which are used to display the working status of the power amplifier. When these three indicator lights are not on, the true color of the light-emitting diodes is close to very light green. When they are on, they will emit different colors. When the three indicator lights of the fake power amplifier are not on, the true colors of the light-emitting diodes are red, yellow and green respectively. There is a row of function switches on the left side of the Alpine MRV-F407 power amplifier. These switches are embedded in the casing of the machine body, while the switches of the fake ones are all protruding. Lay the Alpine MRV-F407 power amplifier flat and look at the right side. There are two sets of wiring connections and a fuse box. The order from left to right is: speaker wiring, fuse box (one placed horizontally, orange), and power wiring. The order of wiring of the fake power amplifier is: power wiring, fuse box (two placed vertically, different colors), and speaker wiring. Based on the above points, you can quickly identify the authenticity of the Alpine MRV-F407 power amplifier.