alright well i had a few more questions? im building the box out of 3/4 in mdf wood. the meauremtents are goin to be 28x30x11 for a 4ft sealed enclosure. Is it really nessecary to divide the box into 4 chambers? What will be the pros and cons of this? And i really wanted to stay with the alpine m1001 amp, which only puts out 1000 watts at 2 ohms. Would i be ok with that, 250 goin to each sub, or should i shoot for a pg tantrum 1200, which i really do not want to becuase i want to stick with all alpine. Thanx in advance