Square Inches Of Port

[g2shuck]

Right the gsme was to peak your box at the same freq as your vehicles res freq.it.only had to play that one freq too. There.is no way I could ever consider anything over 20 sq in of port per cube for musical use. Even that scares me. My limit is really 17 to 18 for woofers that willplay music .

I will be between 19-20 inches per foot with 250 square inches and 13 cubes net. Sound ok?

[n8ball2013]

For me no. But its not my money.

[Slinky]

I wish I was able to test this out without it being super expensive. I just don't see how the calculator is correct. I entered in 2 12's and 40 mm xmax with 38 hz tuning and its telling me a minimum of 166.54 sq in of port. There's no way 2 12's need that much port.

40 MM of Xmax is seriously hefty.

And like N8 and myself said, you can surely get away with less in a vehicle cabin. Every vehicle is different and how much less depends on more factors than one.

And it's not super expensive to test. Build two or three boxes, that's just a couple sheets of wood for a couple of 12s.

True, 40 is a lot. I think as long as I don't hear port noise then I'm in the clear. Hell I have the subs in a crappy prefab right now in a 3.6 cu ft enclosure with 45 sq in of port and theres no port noise.

[g2shuck]

How the hell can I make an interchangble port if the port is 3 common walls lol. Then I could test both 250 sqaure inches and the 15 inches per foot on my TL.

[Bump4life]

ive been hearing talk of this bigger port everywhere. im wanting to see results from people who have done this. also i would think it loses musicallity due to less control of cone. a stiffer suspension is needed maybe?

[Souldrop]

I hate saying this but its.all install dependent. I used to hang and know alot of hardcore spl guys. Like guys who had boxes stacked in their garage that they could pull out and show you the writing on the top of the specs and what score it did at what freq. Power didnt matter because they were overdriving their woofers anyways. Alot of street a b and c boxes that were done with one battery as well. Alot of ugly 2x4s in the ports extra baffles etc. They could range from a couple thousand watts to about 5k in most cases. Small time for us now but at that point it was big time. Alot of what theyd see was larger ports loss of cone control. Extremely peaky boxes and more woofers that went poof.

I could definitely see this being an issue. I'm not sure if Small's formula takes into account the damping factor of the enclosure. he was after reducing port velocity.

[CleanSierra]

I wonder if that is why companies like DD and SQ recommend port on the higher side? Stiffer suspensions and high Xmax.

Btw, I'm glad N8 and others are chiming in. I know he's been around a lot and has(and knows people) seen a lot for good real world experience.

Edited December 2, 2013 by CleanSierra

[Bump4life]

I wonder if that is why companies like DD and SQ recommend port on the higher side? Stiffer suspensions and high Xmax.

i think so. the bigger the port with dd the louder i have gotten.

[n8ball2013]

ive been hearing talk of this bigger port everywhere. im wanting to see results from people who have done this. also i would think it loses musicallity due to less control of cone. a stiffer suspension is needed maybe?

Exactly. Its the new cool thing to.do

[Bump4life]

ive been hearing talk of this bigger port everywhere. im wanting to see results from people who have done this. also i would think it loses musicallity due to less control of cone. a stiffer suspension is needed maybe?

Exactly. Its the new cool thing to.do

just like ct sounds and mmats

i remember skar a year ago...\

edit: not talking crap about any of the companies. just every year there is this new company that everyone wants to run, good or bad.

mmats and ct sounds are legit or at least so far from all tests ive seen

Edited December 2, 2013 by Bump4life