Yamaha EQ-500U is a stereo graphic equalizer that provides detailed control over the frequency spectrum of your audio. With 10 bands of equalization, you can fine-tune the sound to your liking, whether you're listening to music, watching movies, or playing video games. The EQ-500U also features a spectrum analyzer that lets you visualize the frequency response of your audio in real time. This can be helpful for identifying problem frequencies or for fine-tuning your equalization settings.