6"port?

[jeremiah 10+ year member]

if i build a 2 cu.ft ported box tund to 40hz with a 6" round port how long would

the port half to be?

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[danteBirosel 5,000+ posts]

Assuming this is for one 12" sub, u will need a straight length of 19"

 

[jeremiah 10+ year member]

19"!! //content.invisioncic.com/y282845/emoticons/frown.gif.a3531fa0534503350665a1e957861287.gif what about a 4" port

 

[Big Dee 10+ year member]

19"!! //content.invisioncic.com/y282845/emoticons/frown.gif.a3531fa0534503350665a1e957861287.gif what about a 4" port

If the net volume is 2 cu ft then you need a length of 7.45".

 

[jeremiah 10+ year member]

do you think it would have better SPL than my slot port box tuned to 32?

 

[Big Dee 10+ year member]

Above 40 hz, yes, below 40 hz, no. It's a trade off, you will gain some and lose some. If you're going after pure SPL than yeah, you will gain more raw SPL at around 50 hz.

 

[jeremiah 10+ year member]

it's the moe lester( 2 @ 32 #1 box plan)

 

[jeremiah 10+ year member]

Above 40 hz, yes, below 40 hz, no. It's a trade off, you will gain some and lose some. If you're going after pure SPL than yeah, you will gain more raw SPL at around 50 hz.

how many more db would i get

 

[mattf 5,000+ posts]

how many more db would i get

27

 

[jeremiah 10+ year member]

27

//content.invisioncic.com/y282845/emoticons/eyebrow.gif.fe2c18d8720fe8c7eaed347b21ea05a5.gif be serious

 

[danteBirosel 5,000+ posts]

it really depends on the setup and the car bro. U cant just expect someone to throw out a number and expect that ur going to that much instantly.

It's all on the setup.

 

[wilzyx 5,000+ posts]

you cant tell. and taht box will get loud but sound like assholes

 

[danteBirosel 5,000+ posts]

Above 40 hz, yes, below 40 hz, no. It's a trade off, you will gain some and lose some. If you're going after pure SPL than yeah, you will gain more raw SPL at around 50 hz.

depends on his resonant frequency. That will be the best way to tune ur enclosure.

It's all about testing testing testing testing!

 

[Big Dee 10+ year member]

how many more db would i get

It depends on the sub. I'd say about 2dBs, but below tuning you're gonna lose more than that. Peak SPL will go up around 50 hz, but avg SPL across 20-40 hz will drop a few dBs or so.

 

[Big Dee 10+ year member]

depends on his resonant frequency. That will be the best way to tune ur enclosure.

The subs response will do what I said, what the car does to it afterwards is a different story, but if the sub puts out more at x frequency you will see that in reality, but exactly how much is up to the setup, I agree on that.

Trust me I know about adjusting to your car, the box I'm building tommorow goes against all conventional advice, but I've measured my car's response and I know what I need.