95_1500 Posted July 31, 2007 Report Share Posted July 31, 2007 I have a 95 silverado reg cab with 4 10's and no room left. My dad just gave me his 99 burban so i figured what the heck. I have a 12" audiobahn eternal and wanted to buy 3 more and design a huge ported box for it tuned to about 33 or so. My question is how do you know what volume to make the box? Audiobahn recommends like 3.5 gross volume for these subs but thats with 2 aero ports 4" by 16.25 or somethin like that tuned to 35. Or do you just use your space and design port according to the volume you have? I wanted about 10 ft^3 and i dont know the first thing about port design. Subs up port back right in the middle like steves i was thinking. As soon as i get home ill post up some measurements and hope someone could gimme an idea of port area etc. Just trying to get started. Thanks Brett Quote Original Build http://www.stevemeadedesigns.com/board/index.php?showtopic=24095 Link to comment Share on other sites More sharing options...
roscoe1129 Posted July 31, 2007 Report Share Posted July 31, 2007 (edited) Well if audioblah wants 3.5 per sub then make the box 14 cubes and two "aeroports" per sub, or design your own square/slotted port so that you only have one. Edited July 31, 2007 by roscoe1129 Because I can! Quote Some people need a sympathetic pat... on the head...with my hammer Scientia est Vox "In Nomine Patris et Filii et Spiritus Sancti" DONT BE AFRAID TO USE THE SEARCH BUTTON!!! SMD SUPER BUYER/SELLER Link to comment Share on other sites More sharing options...
95_1500 Posted July 31, 2007 Author Report Share Posted July 31, 2007 Well if audioblah wants 3.5 per sub then make the box 14 cubes and two "aeroports" per sub, or design your own square/slotted port so that you only have one. That was my main question if i do one square port do i have to make it 3.5 per sub or could i just use say 10 cubes and design the port accordingly? And instead of saying i want 35 hz.. I wouldnt be competing just daily driver, would recommend more like 30 or what? Im completely fine on sealed enclosures but dont know anything about ported except that you get better SPL. So thats why im interested. Quote Original Build http://www.stevemeadedesigns.com/board/index.php?showtopic=24095 Link to comment Share on other sites More sharing options...
roscoe1129 Posted July 31, 2007 Report Share Posted July 31, 2007 design the box for four subs and then design your port according to that box and for those subs 35 hz is low enough. They wont play well much lower than that. Quote Some people need a sympathetic pat... on the head...with my hammer Scientia est Vox "In Nomine Patris et Filii et Spiritus Sancti" DONT BE AFRAID TO USE THE SEARCH BUTTON!!! SMD SUPER BUYER/SELLER Link to comment Share on other sites More sharing options...
95_1500 Posted July 31, 2007 Author Report Share Posted July 31, 2007 design the box for four subs and then design your port according to that box and for those subs 35 hz is low enough. They wont play well much lower than that. Alright thanks Quote Original Build http://www.stevemeadedesigns.com/board/index.php?showtopic=24095 Link to comment Share on other sites More sharing options...
95_1500 Posted July 31, 2007 Author Report Share Posted July 31, 2007 Alright outer dimensions 46.5x15x36. Inner- 45x34.5x13.5. After sub displacement net volume is 10.5 ft^3. Like i said like Meades box i want a square port right in the middle of the box facing back. Now I know about the formulas for doing slot ports like for finding port length. But could someone get me pointed in the right direction of port area and length for 35 hz? Quote Original Build http://www.stevemeadedesigns.com/board/index.php?showtopic=24095 Link to comment Share on other sites More sharing options...
roscoe1129 Posted July 31, 2007 Report Share Posted July 31, 2007 Height 6.78 Inches Width 6.78 Inches Vent Length 4.04 Inches Quote Some people need a sympathetic pat... on the head...with my hammer Scientia est Vox "In Nomine Patris et Filii et Spiritus Sancti" DONT BE AFRAID TO USE THE SEARCH BUTTON!!! SMD SUPER BUYER/SELLER Link to comment Share on other sites More sharing options...
95_1500 Posted July 31, 2007 Author Report Share Posted July 31, 2007 Alright i see you want 12-16 square inches of port area per cubic foot of volume. So what if i did 12x12 and got 144 sq inches. obviously 14.4 square inches per cubic foot. Quote Original Build http://www.stevemeadedesigns.com/board/index.php?showtopic=24095 Link to comment Share on other sites More sharing options...
95_1500 Posted July 31, 2007 Author Report Share Posted July 31, 2007 Height 6.78 InchesWidth 6.78 Inches Vent Length 4.04 Inches How'd you figure that out? Quote Original Build http://www.stevemeadedesigns.com/board/index.php?showtopic=24095 Link to comment Share on other sites More sharing options...
roscoe1129 Posted July 31, 2007 Report Share Posted July 31, 2007 Lv = (23562.5*Dv^2*Np/(Fb^2*Vb))-(k*Dv) Dv = port diameter (cm) Fb = tuning frequency (Hz) Vb = net volume (litres) Lv = length of each port (cm) Np = number of ports k = end correction (normally 0.732) or you can take my word on it...... Quote Some people need a sympathetic pat... on the head...with my hammer Scientia est Vox "In Nomine Patris et Filii et Spiritus Sancti" DONT BE AFRAID TO USE THE SEARCH BUTTON!!! SMD SUPER BUYER/SELLER Link to comment Share on other sites More sharing options...
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