Thunder4000 T4124A 12" subwoofer with a sturdy laminated paper cone and heavy-duty magnet to deliver BIG bass. Entry-level should mean great performance, that’s why this magnificent speaker was developed..Incorporates Asymmetrical Linear Drive System (ALDS), which uses an extended vented pole piece to smooth out the cone's linear motion and a flat, progressive spider for improved suspension. Extended cone excursion with greater control means bone-crushing bass! This sub performs flawlessly in almost any sealed, ported, or bandpass enclosure.

* 12” SUBWOOFER 4 Ohm FREQUENCY RESPONSE 29-150 Hz PEAK POWER 400 watts RMS 50-200 watts RMS SENSITIVITY 89.7 dB TOP-MOUNT DEPTH 5-7/16" VOICE COIL 2.5” MAGNET WEIGHT 33 oz Sealed box volume 1.25 cu. ft. Ported box volume 2.0 cu. ft. No Manufacture warranty