JL Audio 8W7-3 Subwoofer in very good used condition. I had this sub in my 928. Very musical, tight and fast. It was never abused and honestly does not have very many hours of playing on it. I estimate there are less than 60 hours of play time on this sub. It works and sounds great. It was over $500 new. I will sell for $200 (firm) plus $25 shipping in continental US or pick up from me in Dallas. Paypal= wjhoffmann@hotmail.com

From JL Audio:
W7 8-inch Subwoofer Driver (500 W, 3 Ω)
This subwoofer driver has been called the "best damn 8-inch subwoofer ever made" for its remarkable performance capabilities and design attributes. An impressive linear excursion envelope that exceeds 0.75 in. (19 mm) one-way allows it to deliver impact well beyond the range of other 8-inch subwoofer drivers.
The 8W7AE is best used with amplifier power in the 200W - 500W range and is optimized to operate in a 0.875 cu. ft. (24.8 l) sealed enclosure, or a 1.0 cu. ft. (28.3 l) ported enclosureNominal Diameter8.0 in / 200 mmOverall Diameter (A)8.5 in / 216 mmMounting Hole Diameter (B)6.94 in / 176 mmBolt Hole Circle Diameter (C)7.39 in / 188 mmMotor Outer Diameter (D)5.79 in / 147 mmMounting Depth (E)6.83 in / 173 mmDriver Displacement0.06 cu ft / 1.7 LNet Weight17 lb / 7.8 kg

Parameters

Free Air Resonance (Fs)35.2 HzElectrical “Q” (Qes)0.654Mechanical “Q” (Qms)9.5Total Speaker “Q” (Qts)0.612Equivalent Compliance (Vas)0.61 cu ft / 17.4 LOne-Way Linear Excursion (Xmax)*0.75 in / 19 mmReference Efficiency (no)0.11%Efficiency (1 W / 1 m)**82.7 dB SPLEffective Piston Area (Sd)38 sq in / 0.0245 sq mDC Resistance (Re)2.78 Ω

 

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