Kyle Aaron Jones Posted August 5, 2015 Report Posted August 5, 2015 I recently came into an old Rockford SPP-158. I am making it into a home sub for my friend to mix his drum and bass music on. This will be a gift for his wedding coming up next week. I have always been of the understanding that to create a proper fourth order you must have a larger ported area than sealed. Any idea why winISD is saying otherwise?
Joe X Posted August 5, 2015 Report Posted August 5, 2015 That's because 4th bandpass designs you see around rely on cabin gain and peak to get loud as possible. These designs wouldn't work very nice out of the car.
Triticum Agricolam Posted August 5, 2015 Report Posted August 5, 2015 ...I have always been of the understanding that to create a proper fourth order you must have a larger ported area than sealed. Any idea why winISD is saying otherwise? Because that is an incorrect assumption. Things a done a bit differently in the car audio world. When not being used in a car most 4th order bandpasses have a larger sealed side. Even when used in a car having a larger sealed side isn't uncommon if you are after a flatter response curve. Why not just build a regular ported box? You are using an old version of WinISD, the new one is a lot better, you can get it here: http://www.linearteam.org/download/winisd-07x.exe "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:
Kyle Aaron Jones Posted August 5, 2015 Author Report Posted August 5, 2015 Thank you for taking the time to respond. This cab will be used in home for music reproduction, not in car. I am looking at a fourth order for the large passband and I have always wanted to build one so for use in home the larger sealed enclosure would be preferred? Thanks again!
Triticum Agricolam Posted August 5, 2015 Report Posted August 5, 2015 No prob, glad I could help. If you want to build a bandpass box just because that's what you want to do I totally understand. You will almost certainly get a wider bandwidth and better efficiency with a ported box though. This is especially true for home audio use. "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:
db_speakerbox Posted August 5, 2015 Report Posted August 5, 2015 No prob, glad I could help. If you want to build a bandpass box just because that's what you want to do I totally understand. You will almost certainly get a wider bandwidth and better efficiency with a ported box though. This is especially true for home audio use. I agree. The bandpass I built for home theater use is the size of a refrigerator lol. Little different for straight music tho. What is he going to power it with?
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