Ernesto Posted August 28, 2006 Report Share Posted August 28, 2006 Try to come up with my own plans since I can't think of somebody else that can do it right now so here I go.. Dimensions- 48"= W 18"=H 34"= D Multiplied the numbers 46.5 X 16.5 X 32.5= 24,935.625 Did 24,935.625 divided by 1728 and that = 14.430 14.430 Divided by two = 7.215 So that would be aproximetly 7.2 cubic ft per chamber before port displacement. Using four 6" ports, two per chamber, trying to get a tunning of 35hz. I would cut each port at 13" (length). What do you guys think? Do you think by those dimensions it would sound good or no? This is for two 18" BTLs/ MTs. Quote Link to comment Share on other sites More sharing options...
AP Zoutes Posted August 28, 2006 Report Share Posted August 28, 2006 without subtracting for dispaclements and bracing you are correct. You will have alot of displacemment you need to subtract before figuring your port lengths. Your on the right track. My suggestion is use the plans you have but don't cut port lengths until all the building is done and you know how much bracing to subtract. Plus instead of using 3/4" walls IMO you should at least double the walls to 1 1/2". And the diplacement by the sub and ports will greatly affect tuning. Quote Link to comment Share on other sites More sharing options...
Ernesto Posted August 28, 2006 Author Report Share Posted August 28, 2006 Yeah I will be fiberglassing a lot of the inside and using some steel rods I have. Double layering the top, fiberglassing the corners. Sounds good or do i need more? Quote Link to comment Share on other sites More sharing options...
AP Zoutes Posted August 28, 2006 Report Share Posted August 28, 2006 Maybe use one inch and double the top and all the other stuff you mentioned. If you've looked at mine I always go overboard. HEll, for two 18's I'd probably do 2" and double the long runs but that's just me. How much power??? Quote Link to comment Share on other sites More sharing options...
Ernesto Posted August 28, 2006 Author Report Share Posted August 28, 2006 About 2,000rms on each sub. Quote Link to comment Share on other sites More sharing options...
AP Zoutes Posted August 28, 2006 Report Share Posted August 28, 2006 You should be okay but don't take my word as gospel. Maybe, someone else could chime in.... Quote Link to comment Share on other sites More sharing options...
dmz2711 Posted August 28, 2006 Report Share Posted August 28, 2006 Try to come up with my own plans since I can't think of somebody else that can do it right now so here I go.. Dimensions- 48"= W 18"=H 34"= D Multiplied the numbers 46.5 X 16.5 X 32.5= 24,935.625 Did 24,935.625 divided by 1728 and that = 14.430 14.430 Divided by two = 7.215 So that would be aproximetly 7.2 cubic ft per chamber before port displacement. Using four 6" ports, two per chamber, trying to get a tunning of 35hz. I would cut each port at 13" (length). What do you guys think? Do you think by those dimensions it would sound good or no? This is for two 18" BTLs/ MTs. I am really not an "expert" at this, so i might be wrong, hopefully someone can clarify this if i am but... the only thing that doesn't look right to me is that you did not account for the center divider, that seperates the two chambers of the box.. the 48" in width, should have had .75 + .75 +.75 = 2.25" subtracted from it. That accounts for the two ends(.75" each) and the center wall .75".. here are my calculations... 48 - 2.25 = 45" 18 - 1.5 = 16.5" 34 - 1.5 = 32.5" 45 x 16.5 x 32.5 = 24131.25 24131.25/1728 = 13.965 ft^3 13.965/2 (chambers) = 6.9824 ft^3 (2) 6" ports in each chamber @ 35hz = 13.43" the only thing that i did not account for is speaker displacement, since i have no idea what it is... :^ Quote Nobody makes me bleed my own blood, NOBODY!!! Link to comment Share on other sites More sharing options...
Ernesto Posted August 28, 2006 Author Report Share Posted August 28, 2006 You should be okay but don't take my word as gospel. Maybe, someone else could chime in.... LOL I think I will...We'll just have to wait and see.Won't have the setup done any day now so that should give me plenty of time to start on the box and see what I decide to do. Quote Link to comment Share on other sites More sharing options...
Ernesto Posted August 28, 2006 Author Report Share Posted August 28, 2006 Speaker displacement is .26 cubic ft. Quote Link to comment Share on other sites More sharing options...
Ernesto Posted August 28, 2006 Author Report Share Posted August 28, 2006 BTW DMZ your right. I forgot to do it at 2.25 instead of 1.5 Quote Link to comment Share on other sites More sharing options...
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