The JVC SEA-135 is a graphic equalizer designed to enhance audio playback by allowing users to shape sound frequencies to their preferences. It features a 10-band equalization system, which provides precise control over the tonal characteristics of the audio signal. Each band can be adjusted to boost or cut specific frequency ranges, enabling a tailored listening experience. The unit is designed for ease of use, with a straightforward interface that includes sliders for each frequency band. Additionally, it often features input and output options to integrate seamlessly with a range of audio components, enhancing the overall sound quality of home audio systems. Some models may have LED level indicators to show signal levels visually, contributing to more accurate adjustments. The SEA-135 is compatible with various audio sources, making it a versatile choice for users looking to optimize their sound experience.