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Reload Thread: trying to get four L5 8" subs tuned to 36 hz

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    trying to get four L5 8" subs tuned to 36 hz

    Hello, I am needing a little help with a box i am building. I am going to be putting four 8" L5 subwoofers in a single cab 08 f150 with the pocket doors. Ive measure the space and its 51w, 22h, and 6d and that should put me around 3.5 cu. f.t before disp. My question is this, I want to do 3-4 round ports beause ive heard they are more acurate. Can someone help me please?







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    Re: trying to get four L5 8" subs tuned to 36 hz

    Quote Originally Posted by charlesarms85 View Post
    Hello, I am needing a little help with a box i am building. I am going to be putting four 8" L5 subwoofers in a single cab 08 f150 with the pocket doors. Ive measure the space and its 51w, 22h, and 6d and that should put me around 3.5 cu. f.t before disp. My question is this, I want to do 3-4 round ports beause ive heard they are more acurate. Can someone help me please?
    if you do 3-4 ports they most likely will be to long to fit in your box. If i was in your situation I would do one 6" aero. I think that would be much easier and It should be enough port area for 3.5 cubes.



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    Re: trying to get four L5 8" subs tuned to 36 hz

    how would i do an aero port? Ive never done round ports before? Or point me in a direction to calculate and be educated on aeroports?




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    Re: trying to get four L5 8" subs tuned to 36 hz




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    Re: trying to get four L5 8" subs tuned to 36 hz

    Thanks, so 6" round port about 12.5" should be enough to tune the box to 36 hz on 3.5 cu. ft. after disp? I figured roughly .2 cu. ft. per sub disp puts me around 1.0 cu. ft. disp and building the box at 4.3 cu. ft. (52w, 22h, 8.5d) should do the trick




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    Re: trying to get four L5 8" subs tuned to 36 hz

    *eek* I gurantee each sub does not hold .2cubes of displacement. You should be able to find the exact figures on the webiste or call 'em.




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    Re: trying to get four L5 8" subs tuned to 36 hz

    Ok.... so 49.1 cu. inches PER 8" sub x 4 subs = 196.4 cu. inches converted to cubic feet = 0.113 cubic feet.... am i on the right track here?




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    Re: trying to get four L5 8" subs tuned to 36 hz

    Quote Originally Posted by Ronny View Post
    *eek* I gurantee each sub does not hold .2cubes of displacement. You should be able to find the exact figures on the webiste or call 'em.
    x2 i'd guess .1 at the most



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    Re: trying to get four L5 8" subs tuned to 36 hz

    So, all four subs will take up only .113 cu. ft.? So as long as I build the box, lets say, at .8 cu. ft. per sub = 3.2 cu. ft. total, so pretty much build the box to 3.5 cu. ft. and I should be good? Sorry i am being so thorough, just wanna get it right the first time around.




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    Re: trying to get four L5 8" subs tuned to 36 hz

    You don't have enough room, 51" x 22" x 6" using 3/4" MDF only nets you 2.64ft^3 before displacements...maybe just run sealed or use just a pair of them.



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    Re: trying to get four L5 8" subs tuned to 36 hz

    Just measured again..... 51w, 23h, 7.5




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    Re: trying to get four L5 8" subs tuned to 36 hz

    Just out of curiosity, with such a tight fit and all. Have you explored the option of a box in the bed of the truck ported to the cab? I had 4 12's in an S10 done this way. Either you lose your cabin room, or you lose your truck bed room.... I believe it was a bandpass box they built for me...was several years ago.




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    Re: trying to get four L5 8" subs tuned to 36 hz

    L7 8"s do better with ~1cu.ft each on a ported build. Build the box to 4.5cu.ft GROSS, after bracing and sub displacement you will be at 3.8-4cu.ft. . Do some simple geometry and find the internal volume. Use the PSP calculator i linked above. If you don't have that much room..........use two or go sealed. Simple enough?



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    Re: trying to get four L5 8" subs tuned to 36 hz

    Your right man, SPL needs 1.0 cu ft, but I don't want ALL spl..... i need it to sound decent on music too.
    Last edited by charlesarms85; 02-14-2010 at 08:24 PM.




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    Re: trying to get four L5 8" subs tuned to 36 hz

    Quote Originally Posted by azphat12 View Post
    Just out of curiosity, with such a tight fit and all. Have you explored the option of a box in the bed of the truck ported to the cab? I had 4 12's in an S10 done this way. Either you lose your cabin room, or you lose your truck bed room.... I believe it was a bandpass box they built for me...was several years ago.
    I would, but man, sqeezing a loud set up in a decent size space if fine with me. I have the "pocket doors" on my reg cab so my reg cab is ALOT bigger than most reg cab trucks.




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