box tuning help afte box is built

[TexMexThugga]

i just built a box for 3 10s 37" wide 12" depth and 12" high. the port is 9" deep and 2.5" apart. i dont know what the tuning is and im sure its too high and if it is how would i lower it ill try to put real pictures tomarrow

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[IonRL205 10+ year member]

So you're saying you built an enclosure and just put a random sized port on it, not even knowing what it is tuned to?

 

[mylows10 5,000+ posts]

pretty much i think

 

[mylows10 5,000+ posts]

dude your box is tuned to like 50 htz,you need to add alot more port

 

[MANTI5 10+ year member]

Well that's different

 

[TexMexThugga]

my friend helped me with the port design and how can i lower it to like 27 to 32hz that is the biggest i can make the box because i have a small trunk. can i make the port space smaller and add another board or what can i do?

 

[Mitch86 5,000+ posts]

I'd just build a sealed box to spec if I were you.

 

[TexMexThugga]

i had a sealed box and i wanted ported so i made this one

 

[RSDXzec 10+ year member]

i had a sealed box and i wanted ported so i made this one

mistake number 1, don't port a sealed box, they're usually too small.

Also a lot of calculation goes into making a port, you can't just put one on.

 

[cyn 10+ year member]

spend $40 on mdf/screws/glue and rebuild it.. hit up mobile enclosures / pro-rabbit or buck for a box design to spec for the subs / car they can make it work in there one way or another.... might even be better off going to 2 of the 10"s instead of using all 3

 

[TexMexThugga]

mistake number 1, don't port a sealed box, they're usually too small.
Also a lot of calculation goes into making a port, you can't just put one on.

I still have my sealed box I built this one becouse I got 2 sheets for free

 

[RSDXzec 10+ year member]

I still have my sealed box I built this one becouse I got 2 sheets for free

ah sorry I misunderstood. Hopefully you made it bigger than your sealed box.

 

[TexMexThugga]

ah sorry I misunderstood. Hopefully you made it bigger than your sealed box.

The box is bigger before I had two seperate boxes now I want to find a way I can lower the tuning on the box between 27hz and 32hz

 

[RSDXzec 10+ year member]

The box is bigger before I had two seperate boxes now I want to find a way I can lower the tuning on the box between 27hz and 32hz

if you want to lower the tuning you will have to increase the length of the port. So find a way to increase the length externally, then do the maths and find out how long the port should be to make it whatever frequency you desire to tune to. Lucky for you you're trying to decrease the tuning frequency, as increasing the tuning frequency would result in you decreasing the size of the port. Meaning you would have to open up the box.

 

[TexMexThugga]

if you want to lower the tuning you will have to increase the length of the port. So find a way to increase the length externally, then do the maths and find out how long the port should be to make it whatever frequency you desire to tune to. Lucky for you you're trying to decrease the tuning frequency, as increasing the tuning frequency would result in you decreasing the size of the port. Meaning you would have to open up the box.

I don't think I have space to make the port longer externally and can I make the port thinner and then make it longer inside? I kno it will be trouble taking the box apart but if it will work ill do it. And can you help me figure out on tuning it because I'm a pretty big noob at this