Pioneer TS-300D4 12 30cm Champion Series Dual Voice Coil Car Subwoofer 1400W December 10, 2023 admin Give yourself the best sound quality with the Pioneer TS- 300D4. This 4 ohm (4 ohm x 2) twin coil subwoofer has a maximum output of 1,400 W and a rated output of 400 W. It can be used in a housing and in the open air.