Joe X Posted January 11, 2014 Report Share Posted January 11, 2014 Yes you can have loading issues sometimes with that kind of box, given the low tuning and the port being far back Id say is not very likely that this will be a significant problem, if you want to play it safe you can go back to your first design or do something like this: It can be done like shown, the shared port design, or adding a center divider, it becomes just like your first design, separate chambers and individual ports, just ports in the center. Link to comment Share on other sites More sharing options...
theboogieman77 Posted January 11, 2014 Author Report Share Posted January 11, 2014 Cool. Given W=39, H=18, D=26, Port Width=5.8, Secondary Port Length=7,, My box will have exactly 3 cubic feet per sub and be tuned to 31.75 Hz. Displacement included. Maybe it's worth it to shorten port area to be 14 or 15 sqin to get a lower tune in my box with same outer dimensions. I will have to play with that. They are getting 600rms each.Math done w/o 45s Link to comment Share on other sites More sharing options...
Joe X Posted January 12, 2014 Report Share Posted January 12, 2014 Speaking of the box style I posted 5 3/4" wide port 35.25" center line length would tune you to about 30Hz and a little over 3 cubes net per sub. Up to rated power and at that tuning port area would still be enough, BTW if you are unfamiliar with the shared port, the port width splits in half to each side after the turn. Link to comment Share on other sites More sharing options...
theboogieman77 Posted January 12, 2014 Author Report Share Posted January 12, 2014 Here are the final dimensions of what I have drawn up. It may be wrong but probably not enough to worry about. this is top view and box internal height is 16.5 in Link to comment Share on other sites More sharing options...
theboogieman77 Posted January 12, 2014 Author Report Share Posted January 12, 2014 Speaking of the box style I posted 5 3/4" wide port 35.25" center line length would tune you to about 30Hz and a little over 3 cubes net per sub. Up to rated power and at that tuning port area would still be enough, BTW if you are unfamiliar with the shared port, the port width splits in half to each side after the turn. Also I would love a dimensioned drawing of your design. Link to comment Share on other sites More sharing options...
Joe X Posted January 13, 2014 Report Share Posted January 13, 2014 This is a cutsheet in which I based the statements in my last post, you likely missed to consider the end correction for slot ports, for tuning purposes, the effective length is the physical length + half of the width of the port. The base area of each chamber is about 330.9 square inches, the volume of each chamber is 330.9 x 16.5 = 3.16 cubic feet and Vb per chamber is 3.16-0.09 = 3.07 cubic feet without the 45 displacement. Link to comment Share on other sites More sharing options...
theboogieman77 Posted January 13, 2014 Author Report Share Posted January 13, 2014 Thanks, this will help a ton! Time to get this done before the subs arrive. thanks again Joe for all the help and knowledge Link to comment Share on other sites More sharing options...
Joe X Posted January 13, 2014 Report Share Posted January 13, 2014 Glad to help, if you would like to know more on the the end correction for slot ports, here's a link on it: http://intl.jlaudio.com/header/Support/Tutorials/Enclosure+Ports/Tutorial%3A+Enclosure+Ports/656168 Link to comment Share on other sites More sharing options...
Recommended Posts
Archived
This topic is now archived and is closed to further replies.