Subs get hot as they play, and the heat usually gets vented away via a port in the back of the sub’s pole piece. Alpine recessed the pole port and added cooling air vents on the sides of the frame, allowing you to use an enclosure with an inside clearance of as little as 4-3/16″ without blocking critical air flow. An SWT-10S4 will work well in either a ported or a sealed box, so you can get your favorite kind of bass tone, boomy or tight.

• 10″ truck subwoofer with 4-ohm voice coil
• Kevlar reinforced pulp cone with polyurethane foam surround
• power handling: 350 watts RMS (1000 watts peak)
• frequency response: 30-200 Hz
• mounting depth: 4-3/16″
• grille not included
• warranty: 1 year