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    Re: 4th order design 2 alpine type r 15's

    Quote Originally Posted by Tenacious. View Post
    That one looks better. Would an external port be possible in your vehicle? It would be easier to adjust tuning and port area on if you desired.
    Yes it would be I have a SUV and I took out my third row so I have Max room of like 47x50 I'm gonna revise the design one more time and put the adjustable port external and onto of the box to be more esthetically pleasing (well to my taste) and your right. It would be easier because changing the port length and volume would change the overall volume and effect my ratio and tuning if I'm right?







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    Re: 4th order design 2 alpine type r 15's

    Quote Originally Posted by 4bannger View Post
    Yes it would be I have a SUV and I took out my third row so I have Max room of like 47x50 I'm gonna revise the design one more time and put the adjustable port external and onto of the box to be more esthetically pleasing (well to my taste) and your right. It would be easier because changing the port length and volume would change the overall volume and effect my ratio and tuning if I'm right?
    Yes that's correct. Having an external port makes sure that you won't be changing the volume.



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    Re: 4th order design 2 alpine type r 15's

    Quote Originally Posted by Tenacious. View Post
    Yes that's correct. Having an external port makes sure that you won't be changing the volume.
    thanks learning a lot from you and all the other helpful people on this forum. I knew i could find someone knowledgable enough to help me with this. this is the final design here the tuning is the same, port size same except for length
    Attached Thumbnails Attached Thumbnails 4th order design 2 alpine type r 15's-4thorderbox2.0.jpg  




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    Re: 4th order design 2 alpine type r 15's

    Quote Originally Posted by 4bannger View Post
    thanks learning a lot from you and all the other helpful people on this forum. I knew i could find someone knowledgable enough to help me with this. this is the final design here the tuning is the same, port size same except for length
    Where will the port be firing? Towards the rear I'm assuming?



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    Re: 4th order design 2 alpine type r 15's

    Quote Originally Posted by Tenacious. View Post
    Where will the port be firing? Towards the rear I'm assuming?
    firing up towards the headliner.




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    Re: 4th order design 2 alpine type r 15's

    Quote Originally Posted by 4bannger View Post
    firing up towards the headliner.
    It may be louder with a surface to load off of. Port back (or on the side depending on the vehicle) usually works well.



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    Re: 4th order design 2 alpine type r 15's

    yeah I would NOT do port up in an SUV, especially in a 4th order. Many times upfiring causes nulls in upper bass response and that's really going to limit how high you sub will play if you have a sharp null like that, usually it's around 60hz. The low end tends to be better when you fire directly off the rear too, so you'd be screwing yourself on both fronts. My SUV is sub up port back right now, but since my subs can play upper bass no problem, I'll be doing sub back port back here very soon.



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    Re: 4th order design 2 alpine type r 15's

    Quote Originally Posted by Tenacious. View Post
    It may be louder with a surface to load off of. Port back (or on the side depending on the vehicle) usually works well.
    well weather i was to fire it at the hatch door or at the roof i would have the same about of space between the port and door and roof

    Quote Originally Posted by T3mpest View Post
    yeah I would NOT do port up in an SUV, especially in a 4th order. Many times upfiring causes nulls in upper bass response and that's really going to limit how high you sub will play if you have a sharp null like that, usually it's around 60hz. The low end tends to be better when you fire directly off the rear too, so you'd be screwing yourself on both fronts. My SUV is sub up port back right now, but since my subs can play upper bass no problem, I'll be doing sub back port back here very soon.
    Yeah ill take some quick measurment and see whats up. Thanks for the suggestion. I knew that to be true subs but not ports.




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