need help with box and how big should i make my port?

[trunks9_us 10+ year member]

ok i am putting this in a toyota echo and i am going to be using a treo ssx 12.22 running it at either half power of full power depending on if i get my new amp or not. Anyways the length is 36 inches the height is 14 inches and the width is i forgot but its long anyways this is one 12 using 3/4 mdf with liquid nail and ect. its sturdy and pretty heavy now i also want to say i have notice people make box designs like this one http://www.caraudio.com/forum/showthread.php?t=217344 and when saying like this i mean the wood is curved around in areas to give it different hertz. Well i am pretty sure that my friend built just a plain jane rectangle box with no curves inside so basically its a regular empty box. How will this affect me? I mean on the box what should i do should i still port and if so how much i plan on doing a circle port with pvc pip i got me a 6 inch pvc pipe and a 4 inch pvc pipe. I alos have 2 & 3 inch pvc pipes. What should i use smaller or larger? will i be having problems with this box since my friends just built a square box and not cutting off the air pressure inside? i really hope someone can help me i really need the help. thx

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[z71tahoe 10+ year member]

the only reason that box was built like that was the simple fact that it was vehicle specific...for a camaro...tryin my hardest to make out what you're asking...i belive your buds box is a simple sealed enclosure....and with the treos...id do about 3 cubes and port to....38-42hz...ditch the pvc..if you want round ports use precision ports...http://www.psp-inc.com...but personally i favor a slot port...especially on my daily drivers...