d-nice88 Posted October 7, 2015 Report Share Posted October 7, 2015 Ok im doing this just to try n see if I can do one. Im going to be using some cheap 8" subs. Maybe some planet audio 8's. Can I do this and what is the ideal fs number and qts number to look for ? Any help would be great guys just wanna say again im just trying to see if I can do one not trying to win a comp or anything I just got some extra wood on my hands since I never got another design for my fi bl subs. Link to comment Share on other sites More sharing options...
Triticum Agricolam Posted October 7, 2015 Report Share Posted October 7, 2015 For a 4th order bandpass you are going to want subs with a lower Fs and higher QTS (>.5). Fortunately this is what you get with a lot of cheaper subs. If you are going to use 8"s I'd suggest using more than one, otherwise the chamber volumes can be so small it makes things difficult. If you want to use just one sub, get a cheap 12". Do you want to try to make the box sound good, or do you just want to see how loud you can get? "Nothing prevents people from knowing the truth more than the belief they already know it.""Making bass is easy, making music is the hard part."Builds: Link to comment Share on other sites More sharing options...
d-nice88 Posted October 7, 2015 Author Report Share Posted October 7, 2015 I want it to sound good and with just one sub so ill use a 12 insted of an 8 Link to comment Share on other sites More sharing options...
Triticum Agricolam Posted October 7, 2015 Report Share Posted October 7, 2015 OK, keep in mind that with bandpass boxes, everything is a tradeoff. If you want a box that sounds decent, with a wide frequency range and smooth response, its going to cost you efficiency. A ported box will be more efficient. To get more efficient than a ported box, you are going to have to give up a lot of bandwidth. If you want a suggestion for a sub, an Infinity 1260W or 1262W will work well. They are inexpensive, don't suck, and will work decently in a 4th order bandpass design. "Nothing prevents people from knowing the truth more than the belief they already know it.""Making bass is easy, making music is the hard part."Builds: Link to comment Share on other sites More sharing options...
d-nice88 Posted October 7, 2015 Author Report Share Posted October 7, 2015 Ok do you got any recommendations for box measurements? Like to keep it as small as possible with still being in the recommended space requirements. Link to comment Share on other sites More sharing options...
Triticum Agricolam Posted October 7, 2015 Report Share Posted October 7, 2015 For that sub I'd recommend 1.35 cf sealed, 1.25 cf ported @ 45 Hz. That should give you a box that produces pretty smooth even bass, with a slightly rising low end response, depending on how much cabin gain you get. For ports you could use three 3" ports about 20" long, or two 4" ports about 24" long. These are assuming 500 watts of input power. I like to use round ports for bandpass boxes if I can, since they are easier to adjust in length. I recommend starting with your ports long, trying it out, and then shortening the ports to raise the tuning until it sound best to you. Set your subsonic filter to 24 hz to protect the sub. I also recommend having the motor in the ported section of the box, if possible, so it gets better cooling and you can smell the coil if you start to push it too hard. "Nothing prevents people from knowing the truth more than the belief they already know it.""Making bass is easy, making music is the hard part."Builds: Link to comment Share on other sites More sharing options...
d-nice88 Posted October 7, 2015 Author Report Share Posted October 7, 2015 I appreciate it triticum ill give it a shot Link to comment Share on other sites More sharing options...
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