What kind of a box in a truck??
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Silver Member Username: Razzeldazzel06Post Number: 215 Registered: Jan-07 | i hear sealed are better for cars but fr a truck more sq and spl come from ported boxes...if i get two jlw6's and i want them ported and i dont have much room what do i do..is their a small ported box i can get that are somewhat equal to a sealed box just alittle bigger??? |
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Gold Member Username: J_baby15Kentucky Post Number: 1229 Registered: Feb-06 | if its goin behind a seat i would build one like a regular truck box, with a port comin out the side, if u hav the depth to do that. |
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Silver Member Username: Razzeldazzel06Post Number: 216 Registered: Jan-07 | is that true though..it sounds better ported in a truck even for sq and spl then when sealed??? |
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Gold Member Username: J_baby15Kentucky Post Number: 1233 Registered: Feb-06 | if its built well it will sound very good. tune in the mid to low 30s and it will sound nice. Heres one i built. Looks rough in the pics cuz it was jus put in for fittin, and we ran outta MDF for the double front thats y theres plywood there. Edges hadn't been sanded yet either, but u get the idea. this was for 1 15"SSI tuned to 32hz. sounded very good, far better than sealed.   |
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Gold Member Username: Matt12490California USA Post Number: 1653 Registered: May-05 | i still dont get how that thing is for a 15 sub. how much volume does it have again? |
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Gold Member Username: J_baby15Kentucky Post Number: 1239 Registered: Feb-06 | about 2.3cuft., i forgot the port space tho. Sounds very very nice tho, wish i could get sum new pics with it actually looking nice one i fixed the front, sanded, and painted over it(I suck at carpeting). Still didn't put in a terminal either, we jus left the wire runnin out the port. |
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Gold Member Username: MixneffectOrangevale, Ca. USA Post Number: 1507 Registered: Apr-05 | Yes it is true. A sealed box is usually smaller in size compared to a ported box because the difference between a small sealed box's F3 and a large sealed boxes F3 is a very small difference. For example; You may find that your sub can be used in a 1 CF sealed box with an F3 of say 60 Hz. Now if you want a lower F3, you may go as large as say a 2 CF sealed box, but your F3 will only be down to about 50 Hz. So there is a big "space" price to pay just to gain 10 Hz lower. Now, You may find out that the smallest ported box you can build for your sub is still 1 CF, but this will yield a 50 Hz F3. Hmmmmmmmm, it is already lower than the sealed in the same volume. To get a lower cutoff (F3), you may go as large as say a 3.5 CF box, but now the F3 will be as low as say 28 Hz. This is why most people say that a ported box is usually bigger than sealed boxes. They fail to see that the F3 is not the same. The reason people build ported boxes is to change the air pressure inside the box, which in return allows the driver to create larger waves, thus producing lower frequencies. Ported boxes also have a 3dB gain at the frequency that you tune the port at. So this also makes ported boxes more favorable because you get louder. DONT FORGET !!! A ported box has a SHARP downward 18-24 dB slope beyond the tuning frequency, so you are not going to get much lower frequencies than the tuning at expected volumes. A sealed box doesnt slope as sharp as a ported box, so you get a gentle 3-6 dB slope beyond the tuning frequency. This will allow your sealed box to still get lower beyond the F3. So, to exaggerate a little bit, there is a small difference in speaker-to-box output between the sealed and the ported because there is the 3 dB gain that a ported box yields. This is talking about the same size volume box only. |
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Gold Member Username: MixneffectOrangevale, Ca. USA Post Number: 1508 Registered: Apr-05 | Here was an interesting debate. It has a few pictures of graphs that show how a sealed plots out on a graph compared to a ported box. I dont know why my pictures dont upload anymore. I guess they shrank the pics when they put them in archives. https://www.ecoustics.com/electronics/forum/car-audio/199004.html |
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Gold Member Username: J_baby15Kentucky Post Number: 1243 Registered: Feb-06 | how do u figure the F3 of a sealed box? |
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Silver Member Username: Razzeldazzel06Post Number: 217 Registered: Jan-07 | i hear that 1 sub ported has better sq and better spl then two subs sealed in a truck....is this true??? |
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Silver Member Username: Razzeldazzel06Post Number: 218 Registered: Jan-07 | ??????????????? |
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