Do you have to compensate for dual voice coils. If say you have dual 2 ohm coils would the T/S change whether it were series or parallel? For instance QTS, QMS and QES change in regards to the resistance? any formulas? thanks. I ask cause I'm working on a sub project with a friend(spl monster) using a driver with these parameters: RFR3115 FS-22hz DC-resistance-2x2.16ohms QTS-.388 QES-.41 QMS-5.837 SD-860cm^2 VAS-98L Moving Mass-384g CMS-1.28E-04 m/N Voice Coil Inductance-1.74mH BL-12.85Tm XMAX-19mm SPL-88db Pmax-1000watts We are devising a plan on using a slot port for tuned to 35hz in a 21cuft enclosure using 4 drivers wired in voice coils in series and two woofers series then at the amp the 2 pair is wired in parallel for 4ohms. Then we may be making a baffle with a set of ports that can be tuned lower for SQ. They will fit through and cover the slot port with some sort of mounting system.