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    ndnbolla's Avatar
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    two ports instead of one?

    would it make a difference if two smaller ports were used rather than one full sized one.

    i am asking this because I would like to go with that clean symmetrical look if you catch my drift, one port on each side.



    A couple of hunters are out in the woods when one of them falls to the ground. He doesn't seem to be breathing, his eyes are rolled back in his head. The other guy whips out his cell phone and calls the emergency services. He gasps to the operator: "My friend is dead! What can I do?" The operator, in a calm soothing voice says: Just take it easy. I can help. First, let's make sure he's dead? There is a silence, then a shot is heard. The guy's voice comes back on the line. He says: "OK, now what?"




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    Re: two ports instead of one?

    No difference, make sure you calculate the lengths out correctly though!





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    Re: two ports instead of one?

    I was like you and liked the dual look vs the one port look. But I had much more port noise with two instead of 1. I had dual 3 inch pvc ports and went to a single 4 inch port which was actually 2 inches less of port area but it had zero port noise. For example (4) 2 inch ports is roughly the same as 1 single 4 inch port but the (4) 2 inch ports have more port noise because there is alot more surface area on the port walls with the (4) 2inch ports to slow down the velocity of the air. It has to do with the ratio of air vs. port surface area.




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    ndnbolla's Avatar
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    Re: two ports instead of one?

    I dont want to sacrifice anything in doing this so I guess no dual ports for me.

    If I ported a 12W6v2 and tuned it low (27-30hz) would it sound almost as good sealed SQ wise. Obviously sealed has better SQ but should I sacrifice a little bit SQvand go ported. That way I get louder while still maintaining SQ.



    A couple of hunters are out in the woods when one of them falls to the ground. He doesn't seem to be breathing, his eyes are rolled back in his head. The other guy whips out his cell phone and calls the emergency services. He gasps to the operator: "My friend is dead! What can I do?" The operator, in a calm soothing voice says: Just take it easy. I can help. First, let's make sure he's dead? There is a silence, then a shot is heard. The guy's voice comes back on the line. He says: "OK, now what?"

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    DFW40's Avatar
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    Re: two ports instead of one?

    I would go with a single 4 inch pvc port tuned to around 27 hz like you said and it will sound great and still get pretty darn loud.




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    Re: two ports instead of one?

    sealed will sound way better than ported. ported will get louder.

    id stay away from anything lower than 4" IMO. but thats me.




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    Re: two ports instead of one?

    everyone has been slamming ported the last few days
    the new forum boners will now be

    1. upgraded front stage with emphasis on the mid-bass
    2. old (class A/B) amps that are 22 inches long
    3. sealed boxes




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    Re: two ports instead of one?

    Jmac your avatar rocks.




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    Re: two ports instead of one?

    keep it sealed...

    otherwise, JL recommends atleast 18.75 square inches for port area.




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    Re: two ports instead of one?

    okay... now I think I will go sealed.

    Now, JL recommends anywhere between .9 cu. ft. to 1.5 cu. ft.

    What differences in sound and loudness will I hear as the internal volume would get bigger from .9 to 1.5?

    On another note, who would consider this an upgrade from two 2004 12" Type R's in a sealed enclosure. Both have 1 cu. ft. and are being powered by a nine.1 in a 2 ohm configuration.

    I plan on using the nine.1 to power the JL in a 1 Ohm load.


    Wow, I've been here for a while and now I am going back to asking newbie questions huh? Ah well.
    Last edited by ndnbolla; 05-16-2005 at 07:54 PM.



    A couple of hunters are out in the woods when one of them falls to the ground. He doesn't seem to be breathing, his eyes are rolled back in his head. The other guy whips out his cell phone and calls the emergency services. He gasps to the operator: "My friend is dead! What can I do?" The operator, in a calm soothing voice says: Just take it easy. I can help. First, let's make sure he's dead? There is a silence, then a shot is heard. The guy's voice comes back on the line. He says: "OK, now what?"

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    Re: two ports instead of one?

    Quote Originally Posted by HAVINGFUN
    I was like you and liked the dual look vs the one port look. But I had much more port noise with two instead of 1. I had dual 3 inch pvc ports and went to a single 4 inch port which was actually 2 inches less of port area but it had zero port noise. For example (4) 2 inch ports is roughly the same as 1 single 4 inch port but the (4) 2 inch ports have more port noise because there is alot more surface area on the port walls with the (4) 2inch ports to slow down the velocity of the air. It has to do with the ratio of air vs. port surface area.

    in theory... you would think that doubling the port diameter would give you the same port area..... however it is different. two two inch ports at 12" long each (this is only an example) will not give the same tuning frequency of a single 4" port at 6" length....



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    Re: two ports instead of one?

    ndnbolla,

    the smaller the box the more mechanical power handling the sub increases and the "punchier" the bass is. bigger boxes decrease the subs mechanical power handling, and people have found the bass to be a bit "boomier". people who underpower their subs will often put their sub in a bigger enclosure because of this. IMO, the 12W6v2 sounds best with 500-600 watts in 1.25 ft.^3 box.




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    Re: two ports instead of one?

    and because you chose a bad *** sub:


    1.25 ft. ^3




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    ndnbolla's Avatar
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    Re: two ports instead of one?

    Quote Originally Posted by bcarpenterfhl
    and because you chose a bad *** sub:


    1.25 ft. ^3
    thanks bcarpenterfhl, i didn't even ask and you made me one.

    you think that maybe you could decrease the depth and height a lil bit and make it wider. so maybe the width of the box will be 1.75 times the height. i hate to be and *** and ask for a design for free like this.

    Or maybe you make boxes and you would be able to make one for me? Covered with some dark grey carpeting would just about be perfect.

    And of course,



    A couple of hunters are out in the woods when one of them falls to the ground. He doesn't seem to be breathing, his eyes are rolled back in his head. The other guy whips out his cell phone and calls the emergency services. He gasps to the operator: "My friend is dead! What can I do?" The operator, in a calm soothing voice says: Just take it easy. I can help. First, let's make sure he's dead? There is a silence, then a shot is heard. The guy's voice comes back on the line. He says: "OK, now what?"

  15. #15
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    Re: two ports instead of one?

    Quote Originally Posted by HAVINGFUN
    everyone has been slamming ported the last few days
    the new forum boners will now be

    1. upgraded front stage with emphasis on the mid-bass
    2. old (class A/B) amps that are 22 inches long
    3. sealed boxes

    i thought i was the only one who realised that its nice to know others see whats going on as well maybe we can put an end to this at once




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