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Showing results for tags 'Sealed ported bandpass'.
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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.