The JVC SEA-RM 20 is a graphic equalizer that enables users to adjust the audio output of their sound system according to personal preferences. It features 7-band equalization, allowing for precise tweaks across a range of frequencies, typically spanning from 31 Hz to 16 kHz. The unit is designed to enhance the listening experience by providing customizable sound adjustments to suit different types of music and audio content. With controls for balance and a general volume knob, users can effectively tailor their audio environment. The SEA-RM 20 also integrates a sleek design that fits well with various audio setups, including home stereos and car sound systems. The specifications usually include output voltage capabilities and signal-to-noise ratios that cater to audiophiles who seek clarity and fidelity in their sound reproduction.