Pioneer TS-300D4 subwoofer 12" (300 mm).

Pioneer TS-300D4 (CHAMPION series) subwoofer 12" (300 mm).

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 is 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. 

When powered by Pioneer's GM-A Series of amplifiers, the Pioneer Champion Series subwoofers are able to deliver really powerful, rich, high quality bass, no matter what volume level.