There are a few ways that you can tell if Pioneer speakers are fake. One way is to look for the Pioneer logo. If the speakers do not have the Pioneer logo, then they are most likely fake. Another way to tell if Pioneer speakers are fake is to look at the quality of the sound. If the sound quality is poor, then the speakers are probably fake. Finally, you can check with an authorized dealer to see if the serial number on the back of the speaker matches the one in their database. If it does not match, then chances are good that the speaker is fake.