In the booklet that came with my cvrs it gives you the box and port volume for a 1 cvr but i am doing three of them on one port in one undivided airchamber so i was wondering how much bigger should the box and port be? would it be three times bigger since there is three of them?
Yeah, if 2 cubes is recommended for 1 sub, then 6 cubes is fine for 3 subs.
The tuning of the port depends on the volume of the box (after all displacement), the square inches of port and the length of the port. If this is your first attempt at building a ported box I'd recommend just a simple slot port.
Here's what you need to know.
Your max dimensions you have in your vehicle for the box.
Recommended volume for your subs (6 cubes)
Tuning frequency you want. Somewhere around 35 hz is pretty normal.
I usually go for 12 to 15 square inches of port area per cubic feet of box.
Now go here and start playing with the numbers until you have met all these requirements and there you go. You will see the volume and frequency change as you change the dimensions.
2005 Dodge Ram Quad Cab DC Sound Labs Soundstream Blow-through See it here http://www.stevemeadedesigns.com/board/index.php?showtopic=34090
No, that's not how it works. How big (cubic feet) will the box be? What frequency do you want it tuned to?
Ok well part of my question is how big should the box be? If one sub takes 2 cubic feet how big should the box be for all three? Then the port should be a certain displacement for the box right?
So if i go with six cubic feet and the longest the port could be is 3 feet what is the other demensions? and the box should be 6 cubic feet plus the displacement of the port correct? so if the port takes up 2 cubic feet the box would be a total of 8 cubic feet?
The link I gave you will calculate everything for you. And even give you a cut list.
well thank for the link, i was playing with it and i basically found out my port is gonna be huge, is this a practical build?
The slot port is about as simple as a ported box can be.
The port shouldn't be that big. What are your max dimensions for the box?
Well according to the link you gave me the port was gonna be some 7 inches wide 13 inches long and like 60 inches long
namosh:What are your max dimensions for the box?
And what are the dimensions you loaded into the calculator on the link?
From that we (meaning Namosh) can see if you figured anything incorrectly.
Hope This Helps!!!
2002 Ford Focus Sony CDX-GT410u Sony XT-100HD HD Tuner Stock speakers, no amp, no subs
tripscrvs: well thank for the link, i was playing with it and i basically found out my port is gonna be huge, is this a practical build?
Yeah that's actually what I was going to say. If you build an acousitcally coupled box (what you are doing when you have them all in the same airspace) you're going to need one huge port for the three. Essentially you are just multiplying everything by 3 in doing this and usually it isn't practical as you say. What kind of vehicle is this? Is it a daily driver, a competition vehicle, a weekend car, or ???
If it's a normal car and a daily driver where you need at least some trunk space, I would say go with just two subs instead. You can acoustically couple or not, doesn't really matter. Whatever is easiest for you. If you really want to do three subs, make a sealed enclosure instead. If it's like a big SUV or competition vehicle or something then sure, but I don't think it is given you're asking about practicality?