port location

When building a wall, is there a correct placement for the port? Should I put it up? Should I put it down? Advantages/Disadvantages?

Just wanted some opinions on what size port to use to get the most output out of this sub.I'm shooting for 3.3 cu.ft. net @ 33hz. after all displacements.I don't know whether to go with two 4" flared or one 6"flared.Also do you think I'd get more output with sub forward port forward or sub...

alright so im going to put 3 3" flared ports in to a a dual 15 box with 4.88 cubes, its for my polk audio mm1540s and i was wondering where i should put the ports or if it mattered. Flared Port Tube 3" ID x 11" L with 5" Flared Ends 269-165 these are the ports

I ordered a MA HK15x2, and have taken a look at its specs, it needs 5.0CF airspace, two eight inch ports at 13 inches long, and tuned to 32Fhz. can the ports run up to an inch of the back of the box? or do they have to come to some specific point of the box? im trying to fit this in the trunk of...