need help with port hole

[teamsolo 0]

i got a box that is 40x32x17 and trying to tune it to 32hz can someone help me find how big i need the port hole

[///M5 2,833]

We cannot recommend a port area without knowing what power and what drivers you are using. If you want the length that is another trick as well since you have to subtract the volume of the port from the box before the calculation. Of course if you are building an external port it is easier.

[teamsolo 0]

im going to put 4 15" db drive plat series powered by a massive audio d400x..trying to get the numbers for the port like how big and deep it suppose to be

[dopey 0]

We cannot recommend a port area without knowing what power and what drivers you are using.

How does power change tuning?

[DevilDriver 28]

We cannot recommend a port area without knowing what power and what drivers you are using.

How does power change tuning?

It doesn't change tuning but it does increase excursion, potentially requiring more cross sectional area, which will drop your Fb (tuning frequency).

Let's try not to do the "I'll follow you to every thread and bitch" thing; both parties.

[dopey 0]

I'll assume a round port.

I thought cross sectional area was determined by box volume? Because it changes the tuning.

[topgun 262]

A combination of cross sectional area and length of the port determines the tuning frequency. If you have a big arse box, but virtually zero excursion you don't need very much port area due to the fact that there will be little air movement in the box, and vice versa.

[its_bacon12 0]

subwoofertools.com

they have calcs there for ported boxes

[dopey 0]

A combination of cross sectional area and length of the port determines the tuning frequency. If you have a big arse box, but virtually zero excursion you don't need very much port area due to the fact that there will be little air movement in the box, and vice versa.

What car audio subs have "virtually zero excursion"?