subs? sub box? HELP

[stock_vl]

alright this is really starting to annoye me so i need some bodys help with more then half a brain in this field of work!

1800W kenwood amp its around 1000Wrms


i am getting 2 subs more then likely rockwood fosgates
there 500wrms about 1000W max.....

around that area!

i will be building a box with a perspex face so that it can be seen when looking into the boot!

im unsure with the porting etc.....

i know im going to need around 56.6L but im unsure weather to port or not and on top of that where to port etc!

what size?



i know it would be better to have it professionally done but i could only get it done at autobahn n thats an hour drive and there not exactly cheap...

not sure what they would make me pay...


ideas??

any websites or anything i can get diagrams off?

[StoneX]

Rockwood? Or Rockford?

Ports SHOULD be on the same side of the box as the sub, but it's not that important, just try not to have them on opposite sides.

Porting is not easy, the box has to be the right size and the port the right length and diameter to make the sub sound best. You need special software to work out the right dimensions.

You might need to ask some pro box builders on CAA forums.

[stock_vl]

thanks mate!!

welll i have limited it down to either
2x P312D4 rockford fosgate's
or
1x T212D2 rockford fosgate

what is the benefits of ported and non-ported boxs?

[StoneX]

Generally the benefits of a ported box is that it will be louder... But that depends what frequency you tune it to. The box design software will show a graph of the frequency response(volume of sound at all frequencies), so you can see if it is going to be the same volume for everything or if it will have a peak where it is loud for certain frequencies. They can be designed to sound alot of different ways depending on the box size and tuning freq.

The bad things about ported boxes are that they need to be bigger than sealed, they only work WELL on certain subs, they can have a thing called "group delay" which can make them sound "laggy" and not good for fast bass, but you can design the box to keep this low enough not to notice.

Sealed are easy to design, smaller, and sound good for most music. Their frequency response will be reduced at low frequencies, so the low bass won't be as loud as it could be with ported. But most "low bass" is actually around 40Hz which a sealed box will handle fine.