The SI Mag D2 subwoofers have a custom-tooled motor that allows for over 26mm of one-way linear
travel, plenty of motor force, and a large enough voice coil to smother a Coke can. Motor force is +/- 18 Tm for both sizes of our Mag subwoofers. The combination of our light moving mass and ample motor strength give us a winning combination for a true "SQL" subwoofer - one that can do both sound quality and SPL.
Mag subwoofers use a proprietary blend of materials in the cone, which yields a very high strength-to-weight ratio. Surround material is treated foam for longevity and elasticity and is wide/tall enough to accommodate the Mag's 3 inch peak-to-peak throw. Dual 8 inch progressive roll spiders provide most of the mechanical restoring force.
Sure we could have gone with less expensive (or even MORE expensive) materials, but that would have jeopardized the integrity of Mag subwoofers. You see, building a well rounded subwoofer is like building a well rounded race car; you can have the best handling chassis in the world, but if you've got a wimpy motor you're not going to win races. Subwoofers are all about balance too. The cone, spiders, surround, basket, motor, etc, was chosen and/or developed to bring you the loudest best sounding subwoofer money can buy.
Like releasing a friendly, approachable, but mildly deranged ape into the community, the SI Mag's have left their mark in the SPL competition scene. SPL numbers such as 156 dB in the stock division of SLAP, 154 dB in MECA's M4 class, 152.2 dB (a new world record) in MECA S1, 146 dB in the NSPL regular cab truck class of SLAP, 154.4 dB in MECA M5 (an all-time UK record) and an astounding 141.7 dB at 10 Hz are just a few of the results our Mag subwoofers have been able to accomplish.
Re (coils in series) 3.5
Mms (grams) 228
Vas (liters) 39.7
Sd (cm^2) 480
SPL (1W/1M) 85.7
Power handling RMS 900
All Mag D2 subwooers are DUAL 2 OHM.
Sealed 1 to 1.3 ft^3
Ported 2 ft^3 tuned to 32 Hz
volumes above are after port and driver displacement.
Cutout diameter for the Mag 12 is 11 1/16".
Mounting depth on the Mag 12 is 6 3/4".