Question about the free box plans in the stickies

[Pantani 10+ year member]

Is it safe to assume that these plans are going to work for just about any driver? I am new to any kind of box "designing" especially ported. I usually just follow the mfgs recommended sealed enclosure airspace requirement and go from there. I have 2 8" Rockford Fosgate HX2s and was hoping to build a box tuned at around 32hz. I've never had these guys in a ported box and was wanting to give it a shot.

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[dman4486 5,000+ posts]

Every driver will respond differently and have a different "response curve" in varying enclosures. The only way to know what yours will look like is to have someone plot it for you, but I am not at my personal computer so I can not do it.

the plans are proven designs that will work, but your response for the airspace and tuning will vary.

 

[Pantani 10+ year member]

Using WinISD I came up with 1.29 cu ft, tuned to 32.11hz with a square port 10.5" tall by 2" wide with a 3.092' length (I made the port height and width dimensions the same as the 1.25cu ft box plan here((http://img62.imageshack.us/my.php?image=125cubes32hz21sqin4qf.png)). I've just started using this program and have tried to read some tutorials, I believe I'm getting a pretty flat frequency plot. There isn't much on the T/S numbers for this driver, and it isn't a driver that is included in the stock WinISD program, but I filled in what I could find as an "own driver", still not sure if I did all that right though.

I looked at the 1.25 @ 32hz and have they have similar port length numbers. I think that plan has a port length of 3'4.5" if my math was correct. Seems pretty close.

I just don't want to make a mistake before I go to cutting up the wood this upcoming weekend.

 

[WhoSayWho? 5,000+ posts]

Using WinISD I came up with 1.29 cu ft, tuned to 32.11hz with a square port 10.5" tall by 2" wide with a 3.092' length (I made the port height and width dimensions the same as the 1.25cu ft box plan here((http://img62.imageshack.us/my.php?image=125cubes32hz21sqin4qf.png)). I've just started using this program and have tried to read some tutorials, I believe I'm getting a pretty flat frequency plot. There isn't much on the T/S numbers for this driver, and it isn't a driver that is included in the stock WinISD program, but I filled in what I could find as an "own driver", still not sure if I did all that right though.

I looked at the 1.25 @ 32hz and have they have similar port length numbers. I think that plan has a port length of 3'4.5" if my math was correct. Seems pretty close.

I just don't want to make a mistake before I go to cutting up the wood this upcoming weekend.

Check out the Fisher Customs site. I am pretty sure one of the services that he offers through his site is to come up with plans. Not sure who is doing that for BJ.

 

[Trey803 5,000+ posts]

also your vehicle's interior design will affect or maybe effect the low end of the curve also. cabin gain

 

[Pantani 10+ year member]

also your vehicle's interior design will affect or maybe effect the low end of the curve also. cabin gain

The vehicle is a '03 Mazda 6.

Also, I was hoping to be able to just get it figured out for myself. Seeing as how Fisher uses WinISD for their port calculations too, I figure my (or maybe a helpful forum members) calculations can't be much off.

 

[WhoSayWho? 5,000+ posts]

The vehicle is a '03 Mazda 6, and thanks for the idea about Fishers site. Was hoping to be able to just get it figured out for myself, seeing as how they use WinISD for their port calculations too, I figure it can't be much off.

True -- it may not be end up being a dimes worth of difference. I just don't have enough confidnece in my work when I only have the need for a new box every couple years or so.

 

[Pantani 10+ year member]

True -- it may not be end up being a dimes worth of difference. I just don't have enough confidnece in my work when I only have the need for a new box every couple years or so.

Either way I do appreciate the feedback. This enclosure is basically just going to be filler till I can get the funds together for the 12" IDMax V.3, not looking for anything stellar.