well, just finished up the proto, but looks like this will be it, i will start working on it next week to have it done by the mcc meet. tell me what you guys think, if you can make up my handwriting. this are the speakers, ....click here

 

you're going to get lots of port noise. i would either go with more port area or try to flare the ends of the opening a bit to reduce turbulance.

 

im just fallowing the specs that pioneer gives out, .5 cubic feet, with the 3" port, seems big enough, but worst case senarion, ill just put in some really low density foam in or before the port, we'll see, but thanks for the advise though.

 

Have you considered it in the other direction? Flipping the ports into the trunk and the drivers firing into the interior? My guess is that it will rattle the hell out of your bumper/rear plate, and you'll just enjoy some of that whistle off the ports.

The speakers look great. I'd love to know how they sound when you're done.

 

i can always just turn the box around, but i think having the ports into car will direct most of the bass in the cabin, remember this box is free air, the subs are not sealed.
ill post comments on the sound as soon as im done with it, prolly by thursday.

 

free air wouldn't need ports...

 

actually you are correct free air doesnt even need a box at all , what i meant, is that there is no sealed chambers.

 

The port only produces a small portion of the sound. The output of the port peaks at Fb and drops at 12db/octave.

-Robert

 

What's the cost estimate on making something like that?

 

around 300 with speakers (no amp) and thats because i want plexiglass its about $35 for a 22x38 at .22mm thickness; and yea i think i will direct the ports down.