some one check these plans for me?

[davidfre21 5,000+ posts]

Trying to teach myself how to do it, everything look right with this one?

Thanks

Click to read more...

 

[swimfreak26 10+ year member]

I get that you've got the following specs:

1.79 cubes gross

1.04 cubes NET volume

Tuned at approximately 44Hz

The port is, by my calculations, 36" long. You've got to make sure that you add in the length that is added by the thickness of the wood on both the front of the box and on the port walls.

Tuning is the tricky part. For reference, you'd be tuned at 35Hz at about 32" of port length on a box that was 1.81 cubes, so you're doing the calculation correctly (or very close). The problem is that tuning has to be calculated using the net volume rather than the gross volume because the volume taken up by the port doesn't count towards what the driver sees/uses.

 

[davidfre21 5,000+ posts]

The problem is that tuning has to be calculated using the net volume rather than the gross volume because the volume taken up by the port doesn't count towards what the driver sees/uses.

i attempted this by makin the internal volume of the box the size i need after takin away the port volume. which is why its 1.8cubes, i only need 1 cube for my sub