well im not sure if theyre DVC or not. im not positive of the model either but i have one of the following three if it helps any. and yeah each one has its own + and -
MODEL: DBR-12
600 MAX
Fs = 27Hz
Qts = 0.6339
Vas = 3.19 cubic ft
Sen = 90dB
2" polymide coil (4 ohms)
50 Oz magnet
Santoprene surround
MODEL: DBXR-12
1000-W
12" cast subwoofer
Single voice coil 4-ohm
2.5" voice coil, aluminum bobin
MAX Power 1000 Watts
120 Oz double stacked magnet
MODEL: DBXR-12D
1000-W
12" cast subwoofer
Single voice coil 2 x 4-ohm
2.5" voice coil, aluminum bobin
MAX Power 1000 Watts
120 Oz double stacked magnet