bigger = louder??

[kwitcherbichin 10+ year member]

ok this is about box port sizes like 3 inch port 5 inch port...

i see some boxes that have MASSIVE ports then some boxes that have small ports...

wtf is bigger ports made to do burps or what cause i got 2 12s and there the XXX 12s and i made a box tuned to 27 hz obviously for the lows...

now if i made a box that was tuned to the same hz would BUT with a bigger port would the output be more or less...

currently its a 3 inch L port

but idk im new to this box mess so w.e info u all have lets hear it

Click to read more...

 

[mazdakid 5,000+ posts]

how tall is your port?

 

[kwitcherbichin 10+ year member]

should be right at 18 i believe

i can post a video of it so u can get about a guestimate of how big the box is



idk if u can really tell much difference but its there

 

[mazdakid 5,000+ posts]

that port isnt 18" tall, more like 12.5-13.5.

id say you need more port area.

 

[snb778 5,000+ posts]

more port will move more air.... doesnt necessarily mean its louder to the ear.. it will be louder on the mic though.... i believe

you lose cone control out of tuning range with a bigger port though.

 

[FatPat*da*Ratt 10+ year member]

lol

 

[audioholic 5,000+ posts]

How can those ports be 18" long if they are basically the same length as the diameter of your 12" subs? At this point I dont trust your numbers to give any advice. Nothing personal, just saying find a tape measure.

 

[kwitcherbichin 10+ year member]

well for one its 17.5 inches or i can read... its bigger then what u think...

heres a pic just to show its from the insides of the port -_-

 

[dappa5 10+ year member]

more port will move more air.... doesnt necessarily mean its louder to the ear.. it will be louder on the mic though....

not entirerly true / can be too much port and cause unloading /would need to be real big though

 

[kwitcherbichin 10+ year member]

the box is roughly 7.5 cf i think cant remember and dont wanna go back outside to check

i was just askin a question if i had a bigger port would it be louder but idk y i asked that cause the box is tuned low...

but if it would move more air that was what i am lookin for ...

but thnx 4 the help

 

[dappa5 10+ year member]

lol he just :facepalmed: his own thread lol

 

[kwitcherbichin 10+ year member]

nerd talk ^ -_-

 

[30hrtz 10+ year member]

I was wondering the same thing honda xxx. Too bad people are just out to flame huh? Guess we will just have to build a different box with a bigger port to find out. My situation is this.... aq 2.5 10 inch sub in 1.25 net with 25 sq inches of port tuned to 38hz. So if i kept the volume at 1.25 but made the port 35 square inches and kept tuning at 38 by lengthening or shortening ( whatever the program calls for) would it be louder or would it just unload the sub.I am under powering so it shouldnt tear anything up. Maybe someone "else" will post here and help us out.

 

[kwitcherbichin 10+ year member]

cant tell if thats sarcasm but w.e

 

[audioholic 5,000+ posts]

well for one its 17.5 inches or i can read... its bigger then what u think...
heres a pic just to show its from the insides of the port -_-

Well Im still confused, because your video seemed to show the port approx the same length as the diameter of your speakers. Sorry if you consider this a flame, I just really dont see how things add up here. 12" speaker, 18" port. The video should clearly show a discrepancy in the size of these two objects. Am I seeing the enclosure wrong or what?
More port area is not always better. More port area allows the enclosure to unload faster below tuning (bad for music after some point) and increases port length to keep the same tuning (bad for SPL at some point). The port length and port area provide a resistance to air flow that, in conjunction with enclosure volume, creates port tuning.

Imagine blowing through a straw. If the straw is large enough diameter, no matter how long it is, it will create no resistance to your blowing motion. It would be like blowing into mid-air, not a straw at all. At this point, the enclosure would like much like an infinite baffle situation as far as cone motion is concern, but without isolating back waves from the front waves.

Hope this answers your question.