Need Help Tuning First Sub Enclosuere

[Rdannyr]

HI Im building a subwoofer box and need help determining port length.

The Box is 2.188 Ft^3 and will have 2 round 3 inch PVC port.

The ports will stick out of the box 5 1/4 inches

I want to tune it tune 32Hz (is this good for rap and EDM?)

My question is A port calculator website gave me a port length of 14.81 inches

Does this include the 5 1/4 inches that extrude?

Is the 14.81 inches for each port or would each be half of that?

I'm using a 45 degree elbow how do i calculate the volume of that?

Thanks so much

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[C1500martin 10+ year member]

your box is 2.18 gross probably but NET the actual usable air space for the sub is 1.57^3 then you need to account for sub displacement and port displacement... i hope your putting an 8 in this box or pushing the limits of a 10

 

[C1500martin 10+ year member]

for this box to be tuned to 32hz with 2 3" ports they each need to be 21.5 inches long

 

[Rdannyr]

The sub is a 12 infinty 1260w and I though I did account for port volume and driver displacement. Thanks for the answers but how do you figure 21.5 inches?

Agian thanks everybody

 

[C1500martin 10+ year member]

nope none of that was included in your calculations, i used the specs you got on the sheet and this is what i got

your sub is recommended in a ported enclosure 2^3 after port and sub displacement

and i used this for the port length

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what kind of vehicle is this for? a truck?

 

[Rdannyr]

The dimensions giver we're from the inside not outside.

Anyways I have just finished building the box and took actual inside dimensions not calculated ones I'll include in pics

with these measurements I calculated a 15.35 inch port length now.

Since I need 2 it's a total length of 30.7 inches and using a port volume calculator I got the volume of the ports to be 217.0051 in^3

I went back and imputed all the data and added .07ft^3 for driver displacement (estimate infinity doesn't give displacement specs)

All together that gives me a volume of 1.996ft^3 which is perfect because infinity recommends 2ft^3

Is my math correct?

 

[Rdannyr]

 

[C1500martin 10+ year member]

yea i guess so if those are your interior measurements and all your good my friend