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Flipx99
09-30-2005, 10:00 PM
Thanks to help earlier, I downloaded WinISD. Looks okay.I just have a few questions of things I can't find.

I need the following factors, or atleast how to calculate them

SPL
PE

PhatTonyDeMarco
09-30-2005, 10:02 PM
I dont reccomend using that unless you have a lot of experience in box building.. It is inaccurate and will take knowledge to fix its mistakes.

As for SPL, you cant calculate that :eyebrow:


I reccomend THIS (http://accelerator-pedal.com/ported-box.asp) for box design. It will give you an accurate layout of a single vented box design. It is accurate according to most box designers on here.

Flipx99
09-30-2005, 10:06 PM
I already used that to build my initial box...I figured part of my low SPL score is due to box so I want to try again before I upgrade subs. My box is 3.5 cf because the manual says 1.75 cf, per sub. I figure I need to experiment, but I was hoping using a better program would help me calculate.

Flipx99
09-30-2005, 10:09 PM
If I move up to 4 cf @ 37 hertz, it makes a box with port area of 50.75 in^2. This is more than the "golden rule" of 9:1 port:cf rule I read about.

PV Audio
10-01-2005, 02:23 AM
if i recall, Pe is electrical input power

you don't calculate that, you should know it already.

mikescanlon
10-01-2005, 07:36 AM
what kind of subs/amp you running?

got the big three?

got high output alternator?

got zero guauge?

a box is a huge step to a respectable spl number, but without those things, you wont get too high