Sealed box help

[thebread 10+ year member]

I'm relatively new to car audio. I have a 4ch amp and some aftermarket speakers. However I don't have a sub stage yet and I'm looking into it right now. I plan on getting an IDQv2 12". I want a SQ sub and that seems to fit the bill. I've been looking around for specs on the box best suited for it. I also plan on making the box(sealed). The dimensions I plan on using are 20" wide, 16" tall, a top depth of 7.125" and a bottom depth of 8.125". I'm looking for an end result of about .88ft^3. The speaker displacement is .07 ft^3. With those dimensions I end up with around .88ft^3 net. But I don't think I'm accounting for the 3/4" MDF. Can someone tell me what exactly I need to do before designing my box.

Thanks.

Sorry for wall of text...

Click to read more...

 

[JimJ 5,000+ posts]

http://www.the12volt.com has a calculator.

 

[91Chevy 10+ year member]

Those dimensions give 0.873ft³ before displacement, 0.803³ after displacement.

 

[thebread 10+ year member]

How do you figure?

 

[cx-7heaven 10+ year member]

Very good, easy sealed box calc:

http://www.rockfordfosgate.com/rftech/box_wizard.asp

 

[thebread 10+ year member]

Thanks for those links, appears as though I was doing it correct, just needed to be sure.

 

[91Chevy 10+ year member]

How do you figure?

I did me some Maths //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

(Length - 1.5) * (Width - 1.5) * (Height - 1.5) = Volume / 1728 = Cubic Feet

 

[thebread 10+ year member]

Yeah I did that, you must have used a dimension that I didn't accidentally.

 

[nineball 10+ year member]

it would be a lot easier to build if you made it a straight rectangle. no angle cuts to worry about making and sealing it up good would be a snap.

 

[91Chevy 10+ year member]

it would be a lot easier to build if you made it a straight rectangle. no angle cuts to worry about making and sealing it up good would be a snap.

Oops... reading > me. I didn't notice the 4th measurement //content.invisioncic.com/y282845/emoticons/frown.gif.a3531fa0534503350665a1e957861287.gif

 

[thebread 10+ year member]

it would be a lot easier to build if you made it a straight rectangle. no angle cuts to worry about making and sealing it up good would be a snap.

Yeah, I was thinking that myself, and was just going to make 1 depth of 7.625 as opposed to the wedge design.