Car Audio 4-Band Equalizer by Massive Audio®. Quantity Band: 4 Pieces. The Massive EQ 4 is a half din 4 Band Graphic EQ that will correct peaks and dips in sound characteristics associated with most vehicles' interior that dampens and limits both speaker output and imaging. This EQ provides powerful features in a compact sizeThis product is made of high-quality materials to serve you for years to come. Designed using state-of-the-art technology and with customers in mind. It will meet your needs and deliver great quality at an affordable cost.