Fact: These subs pound and take a pounding I was BRtUTAL to them and they served me up what I love hard hitting low tones for hours on end. SETUP: x2 15 in hx2's, x2 Power Acoustik 4000 watt amps in a custom built sealed box with a volume per side of 4 cubic ft. then I stuffed it with poly fill about 8lbs per side and .5 in. carpet pad lined the box inside and out it greatly increased the clarity and volume at the lowest tones. x4 optima yellow tops 1/0 gauge power and ground 20 farad cap, batt. isolater, x2 stinger alternators 1 replaced the factory location for the A.C. in 93 grand marquis. All told alot of work but when I broke them in and finally put an spl meter to them 153.6 was a happy number for me.
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