Clif Posted June 28, 2010 Report Share Posted June 28, 2010 So the sd n a 18 is 1210cm^2 or about 1.3 Ft^2. This really just dose not make sence to me on how a 18" sub has such little "effective cone area". Are the surrounds on these beasts just that big or what? Anyone use a diffrent cone area and get some good results? Im plannin on making a t-line for my new baby 03 Trailblazer EXT LT In Dash Rear Flip Down Polk Audio Font & Rear Stage Hifonics Zeus 4 Chan Amp Hifonics Brutus Mono Amp 12" Rockford Fosgate Power HX2 T-Line tuned to 45hz 18"BTL T-line @31Hz (9 weeks pregnant) Link to comment Share on other sites More sharing options...
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