250- TO 800-WATT AMPLIFIED SUBWOOFER TUBES Built-in amplifier gives you all the power you need to get that EXTRA BASS WITHOUT DISTORTION&#151your other speakers run off the power from your other amplifier or the radio! Tubular design mounts anywhere&#151no need to fabricate boxes or cut holes in your vehicle panels Choice of 3 sizes and power levels Features: • High power 4 Ohm subwoofer • Blue polypropylene cone • Specially-treated black rubber edge suspension • Aluminum voice coil • Bass reflex vent for added sub-bass response • High-quality carpeted construction • RCA/Speaker line input Manufacturer 6-month warranty.