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Message Forums Car Stereo Message Forums > Subwoofers and Speakers > Checking sub box tuning freq?
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jsb91010
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 Checking sub box tuning freq?

Is there a way to check an already made boxes tune frequency? I have a prefab ported box for my 10 and just seems it could hit lower. Thanks guys.

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New Post 07-27-2011 10:20 PM
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SINTORMAN
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measure specs of the box? That seems like the best way to me.

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New Post 07-27-2011 11:28 PM
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sicaudio
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w/o an RTA or similar you will need to know the enclosures internal net size then measure the port and do the math...

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New Post 07-28-2011 09:29 AM
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jsb91010
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well i do know the dimensions, they are: Dimensions: 12"H x 17"D x 16"W ...which i calculate out to 1.36cubic feet. So how do i find out how much port displacement there is? Once i figure that out, the number im left with is the ACTUAL volume for the sub? And then how would i figure out it's tuning freq? My sub calls for 1.0cubic feet @ 35hz, so i figured after sub displacement (.12^3) and port displacement i'd be right about 1.0 even. Just seems like the port isn't long enough after using some programs with those measurements and 35hz tuning. Thanks for you guys help.

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New Post 07-28-2011 03:02 PM
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SINTORMAN
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Don't forget to take into account port wall thickness. That can change your volume.

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New Post 07-28-2011 03:06 PM
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jsb91010
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i don't know how to figure out the port volume displacement? I figure once i know how much that is, i can subtract from total box volume that will give me accurate air space # for subwoofer, then i can put it in the calculator with my port size and it can tell me what the tuning is? Also, i think the box is tuned at 41-42hz from my previous calculations not sure how accurate they are... lol...but will i get alot lower if i get a box @ 35hz, will the bass get heavier and hit harder? Some bass sounds good on current setup but others not so good. For instance, late night tip by 3-6 doesn't really wang like it does in my gf's setup. my sub doesn't have much excursion and doesn't sound very "clean"

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New Post 07-28-2011 03:24 PM
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SINTORMAN
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Too small of a box might be choking the sub. That would mess with cone movement not letting exert as far and making it sound muddy.

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New Post 07-28-2011 03:35 PM
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