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The Sundown E Series was made to be the highest performance subwoofer line in it's price category. Low end extension was the number one design goal as you can see the E8 can extend to under 30 Hz in a vented enclosure! RE: 3.8ohm Fs: 35.8 hz Qes: 0.56 Qms: 6.79 Qts: 0.52 Le: 1.85mH Vas: 47.6L BL: 15.4NA Cms: 0.13MM/N Mms: 156.6grams Sens: n/a 1w/1m Xmax: 12mm one-way linear RMS: 400 watts