The new DS (dual suspension) drivers are not your typical subwoofers. In fact, they are not subwoofers at all. They are Pro Audio woofers to compliment the Pro Audio speakers. These woofers feature dual suspension, high resonant frequencies and extremely high efficiencies!

  PC.15DS PC.18DS
Fs (hz) 48.02 35.99
Qms 7.247 6.391
Vas (ft^3) 2.184 5.329
Cms (mm/n) 0.0698 0.0674
  Mms (g) 157.4 290
Rms (kg/s) 6.555 10.27
Xmax 2 1.5
Xmech 17 16.5
Dia (in.) 14.1 16.69
Sd (in^2) 122.45 194.68
Vd (ft^3) 0.0314 0.0499
Qes 0.424 0.521
Re (ohms) 7.2 7.2
Z (ohms) 8 8
BL 28.41 31.76
Pe (watts) 1200 1600
Qts  0.4 0.482
No 1.562 1.306
1w/1m SPL 93.96 93.18
2.8v SPL 94.54 93.31
VC DIA (IN) 3 4
VC (Ohms) DVC4 DVC4
M-vd (ft^3) 0.27 0.43
Cut-out 14.125 16.625
Depth 6.75 8.875
  PC.15DS PC.18DS
Sm High-Tuned 3.50 Hi-Fb 4.00 Hi-Fb
port (4)4x10 (5)4x15
Fb 56.34 53.15
F3 48.81 47.31
Med High-Tuned 4.00 Hi-Fb 5.00 Hi-Fb
port (4)4x10 (5)4x15
Fb 52.01 45.97
F3 45.43 41.21
Lg High-Tuned 4.50 Hi-Fb 6.00 Hi-Fb
port (4)4x10 (5)4x15
Fb 48.54 41.29
F3 42.73 37.28
  PC.15DS PC.18DS
Sm Low-Tuned 3.50 Lo-Fb 4.00 Lo-Fb
port (2)4x10 (3)4x15
Fb 40.02 40.39
F3 41.44 42.24
Med Low-Tuned 4.00 Lo-Fb 5.00 Lo-Fb
port (2)4x10 (3)4x15
Fb 37.08 35.25
F3 40.33 37.83
Lg Low-Tuned 4.50 Lo-Fb 6.00 Lo-Fb
port (2)4x10 (3)4x15
Fb 34.7 31.82
F3 55.85 35.27