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  1. #16
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    Re: info about spl

    Quote Originally Posted by bbeljefe View Post
    No worries and thanks for replying so I could re read what I mis wrote. :-)

    Higher tuning requires more port area, not lower tuning. That was a mistake on my part, so sorry bout that.

    I'm not an acoustical engineer so I don't really feel comfortable trying to explain the details of why but, I'll try and hopefully someone more knowledgeable will pop in and correct my if I'm wrong or, affirm.

    With high tuning, more air is moved in a given slice of time so more port area is required in order that port noise is minimized. Likewise, higher xmax means more air is moved, regardless of frequency.
    Its all good I had just seen that same thing posted before and was wondering if there was something I was missing







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    Re: info about spl

    Quote Originally Posted by akadj View Post
    With all things equal lower tuning means longer port

    1 cuft enclosure minus displacement of 4" port tuned to 50 hz = 12" long port(0.1 cuft displacement)

    1 cuft enclosure minus displacement of 4" port tuned to 40 hz = 24" long port(0.2 cuft displacement)
    ^^ this is correct , we just got our wires crossed up man




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    Re: info about spl

    Quote Originally Posted by akadj View Post
    But just because you have subs with high xmax and play low frequency moving tons of air it doesn't mean you have high SPL

    And a smaller port cross section or longer port will play lower frequency.

    When.you say subs play easier with more port sounds like your referring to box rise because of back pressure?
    i was reading about spl boxes ports etc
    thats right bigger box smaller port
    smaller box biiger port
    lower tunning less port higher tunning more port
    etc
    as well
    i have bought cdt hd m6+ any idea o experience with them on sealed box?
    i was thinking about `1 cu ft sealed box after displacement, because with ported box im not sure how they will work or how they will sound, not sure if is proper to play them like that
    any experience with them? suggetions?
    thanks to reply and i do really apologize, i have been very busy with new job



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  4. #19
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    Re: info about spl

    Quote Originally Posted by zen View Post
    i was reading about spl boxes ports etc
    thats right bigger box smaller port
    smaller box biiger port
    lower tunning less port higher tunning more port
    etc
    as well
    i have bought cdt hd m6+ any idea o experience with them on sealed box?
    i was thinking about `1 cu ft sealed box after displacement, because with ported box im not sure how they will work or how they will sound, not sure if is proper to play them like that
    any experience with them? suggetions?
    thanks to reply and i do really apologize, i have been very busy with new job
    Depends on how many you have? And what exactly are you planning on doing with them?
    Last edited by akadj; 01-29-2014 at 01:17 PM.




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    Re: info about spl

    Quote Originally Posted by akadj View Post
    Depends on how many you have? And what exactly are you planning on doing with them?
    well not for sure, i just want to have a low end with them, but in future im thinking to buy a 10 to play low low frecuencia (50-40 and down)
    i was thinking also to put them in my back doors maybe resonance frecuencie on door of course will be higher but i think they will work good there too...
    and..
    i will be pushing them with ads ph20
    for sure dont want to make fiberglass pods too hard and a lot of time



    Hu Eclipse cd7000
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    Infiniy Kappa
    Rockford 400a4 sprs amp
    Rockford 1000db subs amp
    Type R 1242 1.6cuft- 37 sqinch @38hz
    2 Type R Swr 1042 Coming soon

  6. #21
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    Re: info about spl

    You would be surprised how good they can sound in the right enclosure.




  7. #22
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    Re: info about spl

    Quote Originally Posted by zen View Post
    well not for sure, i just want to have a low end with them, but in future im thinking to buy a 10 to play low low frecuencia (50-40 and down)
    i was thinking also to put them in my back doors maybe resonance frecuencie on door of course will be higher but i think they will work good there too...
    and..
    i will be pushing them with ads ph20
    for sure dont want to make fiberglass pods too hard and a lot of time
    What did you end up doing?




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