Box should net 1.5 cubes, i was told to tune around 33 hz so i am in between sq and spl, im not looking to compete or anything, its an underseat box in my silverado (3 inch seat lift to gain space). I was told already here that best to face the port towards the rear pass door. My problem with that is that i have a maximum of 6x3 for port area there. Which is bare minimum for port area going by the "general rule of thumb" of 12-16 per cube, but ive read thats a load of junk. I tried winisd, it gave me a ridiculous port area. Im not sure what i did wrong but it came out over 100 sq inches. I did online calculators and got anywhere between 20 and 40 sq inches. So first off, can someone help me out in figuring my port area required? Second is, if i have to sacrifice port direction to accomodate size, how much of a difference will it make if i shoot it all the way over to the driver side or out the front of the box? Thanks.

Ken

There is no correct "rule of thumb" for port area vs. box volume. Port area is determained by driver displacment and power, not box size....

With that 10 at full power a 4" ID PVC pipe or roughly 12 in2 of area will be fine for just about anything you throw at it... You can add more area, but will get diminishing returns...

WinISD only gives you a ridiculous port area if you look for a ridiculoulsy low vent velocity...

When you are in a truck cab, normally firing the drivers and/or port off the back wall or sides near th eback usually nets highest SPL. If you load into the center of the cabin, you tend to get less output.

Hope this helps...

A wise young man told me to try a keep port velocity under 25ms. Model different port sizes in winISD and come up with one that suites your requirements and port velocity under 25ms.

What does power have to do with port area?

more power increases the distance the speaker's cone moves (increase the volume of air the cone is displacing) which results in higher air velocity in the port.

Thanks for the help guys. I think ive got it figured out! Ill find out sunday when i dive back into it!