Outstanding Value Incredible Bass and Design Extra Space Bass The 35 Series shallow subwoofers utilize technologies found in other MTX subwoofers to deliver exceptional bass in a variety of applications. Its shallow mount design make it perfect for tight spaces where you still need bass. The 3512-04S The 3512-04S is a 12" single voice coil, 4Ω, 300-watt shallow mount Car Audio Subwoofer designed to deliver outstanding SPL and sound quality in an affordable combination of state-of-the-art MTX technologies. More Than You Expect The 3512-04S is the ideal subwoofer for audio enthusiasts that don't want to sacrifice space in their vehicle, but still want their sound to bump. Designed for sealed enclosures, this subwoofer is perfectly deployed in pick up trucks, sports cars, or any daily driver that has a trunk full of life's stuff. A great value, this subwoofer continues the MTX tradition of getting More Than Xpected. The MTX Inverted Apex Surround This subwoofer features a new Inverted Apex surround that increases surface area allowing for more air movement and higher SPL, and a progressive suspension that lowers distortion resulting in improvLow profileed sound quality. This subwoofer also incorporates Spider Plateau Venting which is a mechanical cooling process that targets cool air at the voice coil effectively managing the temperature for long term performance. Great For Upgrades 35 Series subwoofers are ideal for improving the sound in any vehicle. Their low profile does not require a large enclosure so they are perfect for most vehicles.