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im gonna make my own box but i was just wondering which way i should face my sub and port because ive seen some sub boxes with the sub firing down and the port forward..i just wanna know if that makes a different in sound
 

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As long as the port and driver have adequate breathing room, there is no sonic difference.
Welcome to the Shack,
To add to what hddummy said make sure if you use a down firing design that you leave enough space between the floor and the driver/port or you may find that the sub will "walk" around the floor. Attaching a bottom plate (leaving the gap between the floor and the driver) helps with this regard.
 

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I have taken no measurements, but with my ported css sdx 10, i notice a huge difference in my room if I change the box from front firing to down firing. When down firing, it sounds like it is out of phase. I have hardwood floors. That may me the culprit. Just my 2 cents.
 

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Greets!

Right, no carpet/padding to absorb the sub system's HF BW, so an absorptive 'phase plug' directly underneath it should help a bit, though it will have to be either have a large area or make it up in thickness to be effective down low. In a typical square/rectangular cab, better to have both the driver and vent bottom loaded to damp them both, otherwise only bottom load the vent, though Sonotube style alignments have some useful pipe loading, so venting out the top and experimenting with damping it to see if it audibly improves its overall performance in-room (AKA critically damping the (sub) system) is desirable.

Best overall for a down firing alignment is a band-pass though as it acoustically rolls off its HF response to create an effective higher order XO slope when combined with an electrical one. Indeed, when properly designed as part of a total speaker system it typically doesn't need an electrical XO if the mains go low enough in a maximally flat (0.7 Qtc) sealed alignment.

GM
 
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