if you have the money its worth investing in the saz2500 but its gonna draw a lot of current more than your alternator can keep up with. and the new soundstream stuff is kinda sketchy. the fuse rating on that is only 175 amps so it will do close to rated but not 2000w. in my opinion I would go with the saz2500 but you will need to do the big three which is very simple especially on a blazer. and you will most likely need a secondary battery in the back to support the amp. and only reason I say all this is because I through a 1600w amp and another 1000w amp in my blazer without a secondary battery and my interior light where mega dim and my head lights were really low.

 

onlything in car audio that im stupid about is design/numbers of a box, i can build it all day long, but i havent leard how to turn the numbers into a design. i planed on all 0ga new xs battery for rear, new batter up front, and new alt. thats why i havent bought anything yet so i can buy it all at once.

 

This is what I use when I design boxes its off of soundqubed's website. Its pretty handy

How To Figure Box Volume

Cubic feet is measured by multiplying the height X width X depth of the inside dimensions of the box, and dividing that total by the number of cubic inches in a cubic foot (a cubic foot is 12 X 12 X 12= 1728).
For example, a box with outside measurements of 16 inches high, by 34 inches wide, by 14 inches deep would be figured as so; first we subtract the wood thickness. This is usually ¾” thick, times the thickness of both sides of the box= 1 ½ inches. We subtract this from the outside dimensions.
So now we have
14.5H X 32.5W X 12.5D=5890.625.
5890.625 divided by 1728 = 3.4 cubic feet.
You can keep changing dimensions and refiguring the box volume, until you come up with the ideal box size and shape for your application.
5890.625 divided by 1728 = 3.4 cubic feet.


Calculating Net Volume:


The volume occupied by the woofer and port is approximately 18% of the box. We need to deduct this volume from the gross volume of the box to find the net volume. The port will be calculated on the net volume.

Now, take your 3.4 cubic feet and multiply by .82 (3.4*.82=2.788) so your Net Volume is 2.788 cubic feet.


Calculating Port Area:


Our port formula uses 16 square inches of port area per cubic foot of box volume. Now, take your 2.788 cubic feet and multiply it by 16 so get your Total Port Area 2.788*16 = 44.608 sq” of port area.


Calculating Rectangular Port Dimension:


Port area needs height and width. For a rectangular box with known dimensions, we already have a height, we just need to find the width of the port.

Now, take your 44.608 and divide it by the height of your box, so this example we would divide 44.608/16= 2.788 (this is width of your port opening) Round it to the nearest .25”.

The “Average” recommended length of the port is 18”, tuning around 40hz. The longer you make the length of the port, the lower the tuning. Those that listen to nothing but hip/hop, rap and chopped & screwed, you can make your port length 22-24” long.

 

can anyone give me a couple designs for 2 SA-12's and also, ik that you can run DVC 4ohm subs on @ohms, but would buying the dvc 2ohm put less stress on the sub and that latter on down the road buy a slitley better amp that is 1 ohm capable?

 

Not knocking the the 12s or 15s but how do you feel about 8s? Do 4 SA8v2s on a 2500. It will save on space and still sound really good.

And honestly I am not a fan of any of the new SS stuff. It is poorly made. The old stuff is awesome. But yea if you can spring the $775 for a new SAZ-2500 you will be very happy.

 

if you buy dual 2 ohm speakers you cannot wire them down to 1ohm. you can wire them to .5ohm 2ohm or 8 ohm. I would personally do dual 4 ohm therefore you can run at 4ohm atm then later down the line you can run at 1ohm when you get your electrical upgraded. and check out soundqubed.com for amps there high quality for a good price. I use soundqubed a lot on my installs. Im currently running 2 hdc3 18s in my blazer on a sq 2200d and it doesn't disappoint.

 

to answer your question about 4 8's and the saz2500.. walmart pay check -.-

 

Yep, that would fit, but it still takes up the entire rear of the truck, leaves only a small space in the back for the port to breathe(if the back seats stay up and usable), and would be tall enough to see in the rear view mirror blocking some of the view.

That was my point though, a box for a pair of 15's will eat up pretty much all the usable space in the back of the truck. Now, if the OP is okay with that, which he seems to be, then more power to him and I feel sorry for the windows in that poor truck, lol.



As for this design, it should be right on top of the optimal ball park for the SA-15's, and most other 15's if he chooses to go another route. If the OP is okay with the size, I would be happy to draw it up with a cutsheet if he wants.