Pioneer Champion Series subwoofers are strong, tough and can handle high power at high volume levels without compromising sound quality.With Dual Spiders and Motor Assembly as the driving force, they can produce deep dynamic sounds that are true to the Champion Series name. These models also have a unique Pioneer Dust Protection design, to prevent dust from interfering and compromising the subwoofer performance and reliability. Pioneer Champion Series subwoofers ensure accurate, deep punchy and rhythmical bass by using advanced technologies, such as a Pioneer patented IMPP composite cone material, a rigid 3D-shaped cone design and large double stacked magnets. Upgrade your sound with the Pioneer TS-A30S4. This single voice coil 30cm subwoofer delivers 1400 W Maximum power and 400 W Nominal power. It can be used both in an enclosure or free air use.