MB MSeries subwoofers were designed with versatility and performance in mind. Available in 15", 12", 10", and 8" versions all featuring Memphis Audio's advanced patent pending selectable impedance technology, V-Groove Surround, DVVC Voice Coil Cooling Technology and more features. The MB subwoofers are one of the most impressive forward thinking technologically advanced subwoofers on the market. 
Selectable Impedance Technology
MB Subwoofers feature a multi coil voice coil which connects via color coded jumper cables allowing your to select between a true 2Ω or 4Ω impedance from a single subwoofer. If you ever want to expand your system from a single subwoofer to a dual subwoofer system, no problem, simply rewire your existing subwoofer with the included jumper cables.
This unique surround achieves maximum excursion without sacfiricing surface area allowing MB subwoofers to move more air than traditional surrounds resulting in increased output.