Description: The SML series is a revolutionary line of subwoofers offered by Sundown Audio. An inch shallower than our SLD series, it delivers nearly the excursion, making it an ideal choice for customers seeking an extremely shallow driver with deep bass. Designed to fit under or behind your seat, the SML series performs exceptionally well in small enclosures. Features: 400 Watts RMS/800 Watts Peak Dual 4 ohm Black Aluminum 2.25” voice coil former for superior heat dissipation High temperature 4-layer copper voice coil wire Stitched-on “Mini-XL” tinsel Leads to prevent fatigue and failure Vented pole-piece and vented magnetic gap Dual-magnet design for smooth acoustic response Custom tooled cone shape for reduced mechanical noise over high excursion Bolt-through motor design to ensure maximum longevity and ruggedness Specifications: RE (Ohms): 6.85 FS (Hz): 43.25 VAS (L): 7.978 Qes: 0.591 Qms: 6.38 Qts: 0.541 Le (mH): 4.423 BL (NA): 18.682 Mms (Grams): 96.529 Cms (uM/N): 122.537 Sens (dB @ 1w/1m): 83 Xmax: 14mm Subwoofer Measurements: Depth (Inches): 3.9" Cutout (Inches): 7.65" Motor Diameter (Inches): 6.14 Ported Enclosure Specs: Ported Enclosure Size: Not Recommended Recommended Port Tuning: 35hz Sealed Enclosure Specs: Sealed Enclosure Size: .33-.5cu ft 4th Order Enclosure Specs: 4th Order Sealed Side: .375cu ft 4th Order Ported Side: 1.5cu ft 4th Order Port Area: 12sq in 4th Order Port Length: 6"