hdc3 12 help

[jersyn82]

If I can't get this to work he is where I'm going for a build

 

[Jeffdachef 5,000+ posts]

I'm a newbie at this, by put a lot of 2x4's in the box. Where in the box?

anywhere, just put anything that takes up more cubic feet, it should bring your tuning up a bit. I'd say add big 45 degree corners like biiig and chop off 5 inches of port if you can do so and add even more bracing. to calculate the displacement of the 45s, you find the volume of a triangular prism and to find the volume of the 2x4s you find a volume of a rectangular prism if you wanna be precise.

Formula for 45s 0.5 width x height(include wood thickness) x length = answer divided by 1728 to get cubic feet. For a rectangular prism, width x height x length = answer divided by 1728

You'll want to take up at least .4 cubic feet of displacement because when you make the port shorter you gain cubic feet back also. We are shooting for 35hz and up tuning with a net volume at 2.5 cubic feet

 

[jersyn82]

I'll try the suggestions and see how it goes

 

[jersyn82]

The double baffle wouldn't take up any space the way I have it though would it?

 

[Jeffdachef 5,000+ posts]

The double baffle wouldn't take up any space the way I have it though would it?

oh you'll need to take up even more space then. Make that number .6 instead of .4

You were tuned lower than 32hz before. Around 31hz at 2.9 cubic feet

 

[jersyn82]

That's definitely my problem I'd say then