Z-Enhancer Plus enables you to select your ideal equalising pattern at will from the three types, B-BOOST, IMPACT, and EXCITE, according to the music genre or taste. Also, a 2-band parametric equaliser lets you flexibly set the gain, Q (bandwidth), and frequency of each of the equalising patterns to perform fine tuning of acoustic characteristics such as the adjustment of the power and responsiveness of each of the low, mid and high ranges. With this sound quality control function, the interior of your car will turn into a high-fidelity listening environment.