Alpine R2-W8D4 Battery 8BT gives you access to

8BT gives you access to a great number of tuning options that can be adjusted using the DSP8

7 dB @ 1 W/1m

Frame Material: Reinforced plastic

use quality terminals

Bracing inside the box reduces flex and tightens the low end at high output

Alpine R2-W8D4 Battery 8BT gives you access to8" subwoofer with dual 4 ohm voice coils Kevlar reinforced pulp cone with HAMR Santoprene rubber surround frequency response: 30 200 Hz power handling: 150 350 watts RMS (175 watts per coil) peak power: 1,000 watts sensitivity: 83. 7 dB top mount depth: 4. 631" mounting height: 0. 875" sealed box volume: 0. 2 0. 5 cu. ft. ported box volume: 0. 3 0. 75 cu. ft.