|
New member Username: PlenkPost Number: 1 Registered: Apr-06 | I recently bought 2 of these http://www.partsexpress.com/pe/pshowdetl.cfm?&DID=7&Partnumber=295-550&ctab=10#T abs for my home theater/music system. THe problem I face now is that the F3 for them in my sealed box is 72 or 79 hz depending on what specs I read, and I want it to be way lower than that. If I build a new box for it that is ported or vented, it can lower it to 50hz or so. So the questions I face are these: What volume of the box do I make? I have specs that came with the sub that say to use a .6 cu ft box with a 1"x8"x25" slot port, and one that says 1.2 cu ft with a 3"x17" port. The specs that are posted on that link for the sub under the project ideas<vented cabinet recommendation are .955 cu ft with a 2.5"x8.49" duct. I was thinking about doing the 1"x8"x25" slot port similar to this design for a car sub http://diamondaudio.com/products/pdfs/Single%2010%20in%20Vented%2005.pdf , but I dont understand what part of that box accounts for the volume and where the total port length starts. On that last link I see a warning, is the use of a subsonic filter necessary for the subs I will be using? I wouldnt want to cut off frequency under the f3 like I have seen mentioned elsewhere in these forums because it is so high. But I also dont want to damage my subs. Any help with this would be appreciated. I am trying to achieve the lowest frequency response with the lowest f3 and also sound good. |