Alpine SWC-D84T6 Underseat 20cm Subwoofer Designed For VW Transporter T6 T6.1Alpine SWC D84T6 20cm Passenger Side Underseat Subwoofer Bass box Designed For VW Transporter T6 T6. 1 Models Bring exciting bass to your vehicle with the SWC D84T6 Subwoofer designed for Volkswagen T6. 1 or T6. The 180 Watt subwoofer come pre installed in a custom fit wooden enclosure for installation under the passenger seat to add powerful bass to your existing sound system and is even compatible with the rotary seat of the California camping bus.