ROHM BD37534FV Car Audio Sound Processor IC is a sound processor with built-in 3-band equalizer for car audio. The typical functions are stereo input selector, input gain control, main volume, loudness, 5-channel fader volume, LPF for a subwoofer, and mixing input. Moreover, these devices come with an advanced switch circuit, that is a ROHM original technology. This can reduce various switching noise (ex. No-signal, low frequency likes 20Hz & large signal inputs). The advanced switch makes control of microcomputer easier, and can help construct a high-quality car audio system.