412 CVX Posted February 29, 2012 Report Share Posted February 29, 2012 (edited) The red line represents a 6th order for 2 8's. the rear chamber is tuned to 25hz, the front 60hz (2:1 ratio) The blue line represents a 4th order for 2 8's. ported chamber tuned to 50hz (2:1 ratio) the green line represents a ported box for 2 8's tuned to 36hz the pink line represents a sealed box for 2 8's this graph is showing the loudness (SPL) of the same 8 inch subwoofers over different frequencies in 4 different types of boxes this is a very generalized reference i made so you can see the basic differences between the types of boxes. as you can see both the 4th and 6th order both get louder than the ported and sealed boxes, but their frequency response (bandwidth/passband) is much narrower and peakier. they both roll off sharply after their peak frequency. So what does this mean? ported and sealed boxes can be more musical, and play a wide range of frequencies (somewhat) consistently. Whereas 4th and 6th order bandpass boxes peak at a higher DB level, but can be peaky and fairly inconsistent. Keep in mind that everything changes once you put it inside a car, theory and reality are very different. there are plenty of exceptions in every situation, and for that reason the numbers in this graph are irrelevant. Edited February 29, 2012 by 412 CVX Quote Just say no to Ground Pounder Customs. My temp system build log More box buildssome cars do over 170db with one sub, so clearly my two 12"s can do that in my car, with my knowledge too! look out bitches! I'm with captain stupid. Link to comment Share on other sites More sharing options...
412 CVX Posted February 29, 2012 Author Report Share Posted February 29, 2012 Anyone else wanna add to this? Quote Just say no to Ground Pounder Customs. My temp system build log More box buildssome cars do over 170db with one sub, so clearly my two 12"s can do that in my car, with my knowledge too! look out bitches! I'm with captain stupid. Link to comment Share on other sites More sharing options...
Sergeant_Skyrim Posted March 1, 2012 Report Share Posted March 1, 2012 This is actually pretty interesting stuff. How did you come up with it and what sort of program is that graph? Quote Build in progress Link to comment Share on other sites More sharing options...
Omega5002 Posted March 1, 2012 Report Share Posted March 1, 2012 Designed properly, a ported box can get the flat response of a sealed box, but with extra db's and better deep bass. Somebody should pin this topic Quote 2003 Kia Sorento Team Subsonic LowsTeam Bassin' on a Budget2016 Rebuild Under Construction Best score: 150.2 at 40hz (3k, 2 Custom HDC3 15's) Usaci style(door open, in the kick) Link to comment Share on other sites More sharing options...
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