m3 8 The m3 8 is an 8" long X-Max subwoofer. Long hours in the R&D department is what it took to develop the newest version of our 8" subwoofer. We designed a tall roll stitched surround: oversized spiders: and a tall cast frame that allows for extreme amounts of cone travel. All of these newly designed parts allow for lower frequency reproduction. The bolted down spaced spider design keeps it all linear. The m3 8 uses a gap cooled design to allow the 2" copper coil to thermally take more power than other 2" coil motors with the traditional pole venting. Sub Size 8" Mounting Depth 5.75" Mounting Hole Diameter 7.25" Outside Driver Diameter 8.5" Weight 18 lbs VC Diameter 2" Displacement .1³ ft Magnet Weight 15 lbs Power Handling RMS/Peak 600/1200 Impedance (Ohm) D2/D4 Sd 201.93cm² Vas 7.3L Cms 0.135 mm/n Mms 150.66 g Fs 35.3Hz BL 17.9 N/A Re 6.28 Ohm Le 5 mH Qms 6.68 Qes 0.66 Qts 0.601 Xmax 18mm Ref SPL @ 1 watt 78.7 Suggested Sealed   Suggested Ported  .75³ ft   Next Key Features • Extremely rigid non-pressed paper cone assembly • High Roll Stitched Multilayered reinforced polymer foam surround • Rigid propylene dust cover with White DC logo • Bolted down & spaced Linear roll spiders • Sewn flat heavy duty tinsel lead wire • Custom Cast aluminum black frame • FEA analyzed and optimized motor assembly – Fully CNC machined • Rubber mounting gasket and custom tooled motor boot. • DVC 2.0” Copper voice coil.