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I'm in need of help concerning my first 4th order. I already have two Soundqubed HDS3.1 12 inch subwoofers that are right now sitting in a ported enclosure in a Toyota LC, but the thing is, I have now bought a new car which is a sedan, ported enclosures + sedans isn't the best way to go. After doing my research, I'm planning to build a 4th order bandpass and porting it thru the rear deck. I've done my calculation regarding the subwoofers and they will do a good job in a 4th order bandpass. I haven't yet been able to design a all around good enclosure, ether the gain drops low, it gets too peaky, the port resonance get to high or the port air velocity peaks very high or the port wants to be too long (over 40 inches''). (calculating using WinIsd) parameters of the subwoofers: RMS power: 1200 Watt dual voicecoil: 2 ohm woofer size: 12'' F(s): 33.65 Hz Q(ms): 6,19 Q(es): 0,769 Q(ts): 0,692 V(as): 22,13 litres L(e): 8,62 mH n(0): 0,10% M(ms): 364,4 grams C(ms): 0,06 mm/N BL: 27.2