logspace Posted August 19, 2012 Report Share Posted August 19, 2012 I'm wanting to build a ported box for my 2 alpine type r 12. I would like to tune to around 29 hz or lower, because I want a flatter response. Not looking for SPL at all, I've just heard these subs perform better in ported enclosures. I don't know how to use the tuning calculator. Every once in a while, I will listen to a chopped and screwed song, which is another reason why I want to tune so low. but I also listen to metal and electronic music, so I sometimes think sealed might be better for me. Any advice or designs are appreciated. Thanks Link to comment Share on other sites More sharing options...
logspace Posted August 19, 2012 Author Report Share Posted August 19, 2012 forgot subwoofer displacement is 0.071 cubic feet Link to comment Share on other sites More sharing options...
Joe X Posted August 19, 2012 Report Share Posted August 19, 2012 Here is a suggestion, port centerline length = 25" sub displacement = 0.071 cubic feet: Enclosure Specifications: Fb = 33 Hz Vb = 4 ft^3 External Height = 14 in External Width = 37 in External Depth = 21.75 in Port Width = 4 1/4 in Cut Sheet List: * All Dimensions in Inches. * Wood Thickness is 3/4 for all Parts. External Enclosure Parts: 2x Front = 16 3/8 x 12 1/2 Back = 37 x 12 1/2 Left & Right Sides: 20 1/4 x 12 1/2 Top & Bottom = 37 x 21 3/4 Shared Port Internal Assembly Parts: 2 x Front to Back = 18 1/8 x 12 1/2 2 x Extension = 1 3/16 x 12 1/2 Assembly guide (generic dimensions): 29Hz is really low and not necessary IMO but there you go, it wont be very loud but will hit the lows. Link to comment Share on other sites More sharing options...
JamieHoward Posted September 7, 2012 Report Share Posted September 7, 2012 I am looking to do something similar, but maybe not QUITE as low as 29. Don't suppose you could whip up a 33hz version? What's the net volume of this box? Link to comment Share on other sites More sharing options...
Joe X Posted September 7, 2012 Report Share Posted September 7, 2012 I am looking to do something similar, but maybe not QUITE as low as 29. Don't suppose you could whip up a 33hz version? What's the net volume of this box? Changed to 33Hz 2 cubes per sub, the net volume is listed below the tuning frequency and denoted as Vb. Link to comment Share on other sites More sharing options...
logspace Posted October 2, 2012 Author Report Share Posted October 2, 2012 How big do the 45 degree cuts need to be? Specifically the two at the back of the port. I don't want to make them the wrong size and throw off the tuning. Link to comment Share on other sites More sharing options...
Joe X Posted October 2, 2012 Report Share Posted October 2, 2012 Do them 2 1/2" wide and slant or round the inner corners of the port. Link to comment Share on other sites More sharing options...
racrowe Posted December 2, 2012 Report Share Posted December 2, 2012 so i constructed this box and was about to put the port in when i noticed that the opening of the port was 5 3/16 inches instead of being at 4 1/4. what are my options so that the tuning will still be at 33 hz ? Link to comment Share on other sites More sharing options...
Joe X Posted December 3, 2012 Report Share Posted December 3, 2012 so i constructed this box and was about to put the port in when i noticed that the opening of the port was 5 3/16 inches instead of being at 4 1/4. what are my options so that the tuning will still be at 33 hz ? I can issue a cut sheet list for a 5 3/16" port tuned to 33Hz or you can redo some of the parts so that the port width is 4 1/4", the first option has the disadvantage that the larger port would take away some of the net volume of the box. Link to comment Share on other sites More sharing options...
racrowe Posted December 4, 2012 Report Share Posted December 4, 2012 could you make a cut list for a 5 3/16" port tuned to 33 hz? Do you tihink that it will be loud if i do that? Link to comment Share on other sites More sharing options...
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