luke99

i think thats why you see alot of the larger vehicles using 4 15s

OkanaganDCaudio

I think I was getting terrible box rise out of my last enclosure. When we first hooked it up we noticed a huge current issue that we did not have with the old enclosure that we had just swapped out & thought it must be the batterys just getting old.

When i got back from the show & researched box rise eventually I started to think that was the issue, If i am correct it has to do with the resistance inside the enclosure creating a higher ohm load to each woofer ?

This enclosure has a much larger port & should act in a much more unconstricted manner If i understand box rise correctly. I deffinatly had to re-tune all my gains to get it just as loud with this box, So almost right away in the back of my head i knew I had messed up. Meh, Still had a great time Hell, Even when we put it all together & I saw how small it was inside even before putting the subs in, I was like oh F' what did i do, lol. Then i went back & realised i had copyed the cut sheet wrong & also cut off a huge portion of the box with my epic port experiment fail.

luke99

was the old box smaller then the 2nd box ?

OkanaganDCaudio

The VERY first one i built for the subs, Was the one we replaced before the show.

It had no carpet / paint & only 129 square inches of port was tuned to somthing like 30hz or so.

( port along the bottom facing hatch )

It was about 12 cubes after displacement, But it did not go over the wheel wells & was rediculously high. It thundered out pretty hard & didnt give me as bad of voltage issues.

We felt that it was to close to the roof to be effective & also the port was too small, Witch is why we decided to try & rush a new one before the last soundsgood show.

It sounded alot better though in the end lol The new one just hit highs pretty good, But really didnt preform nearly aswell. I was pretty pissed at myself but the fun of the event quickly took that way lol

luke99

ya the box was way to high of an enclosure needed to be shunk , and the port needed to be twice the size of what it was but all in all was a learning experiance

bjohnstone23

what are the dimensions of the port on your new box?

OkanaganDCaudio

Yeah, Thats how i like to look at it. Also the jimmy has no deadner in it, I.E why my roof looked like a peice of sheet metal in a windy storm.

The hatches of SUV's have little vent areas beside the glass where it closes down so the hatch can close when all the windows are up.

I have heard from sealing thease you can gain 2db alone because they vent out so much SPL.

OkanaganDCaudio

6.5'' opening ? or w/e you call it, lol.
38'' wide
30'' long
( enclosure is 24'' tall goes down 18.5'' then bends into the enclosure )

237 square inches of port

bjohnstone23

ya my port for 2 12's is 6 inches wide, 14 inches tall and 19 inches deep. I am tuned for what i am hoping to be around 42-46hz if I am not at that number when i test I will build a new box and aim for about 36 hz and add resin which should leave me around 39 to 40 hz with sub displacement etc.

OkanaganDCaudio

Yeah just checked the thread out man build looks nice. I cant wait to hear it, I love incriminator If i wasnt running DC I would run incriminator, Deffinatly a great brand.

There was a sunfire down there with 2x AQ 1200s on 2 FI BL 12''s same style setup as you, Not as big of a port though. It sounded great & did some good #'s I cant wait to see how incriminator stacks up. I think it will do very well, Do you use a box calculator ? I find torres box calculator is great for giving you an idea of what your tuning will be.