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Reload Thread: Playing notes under the tuning frequency

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    Icon32 Playing notes under the tuning frequency

    This question still troubles me
    I did some research, which included opening a couple of songs and finding out that they contain large portions of low notes (8,20,25hz,etc.). Notes under tuning frequency are bad for ported subwoofers , right ?

    the thing is that i know A LOT of people with ported boxes and they don't have a clue about their tuning frequency (it's a high one anyway) , yet that don't have problems even playing bass tests and all kind of subwoofer beaters

    Irrelevant , but i asked my local car audio shop about this and they had no idea , "we never heard of that problem"

    So .. bass tests that have peaks at 20,30 for example can destroy a sub in a ported box with a let's say , 35Hz tuning freq ?







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    Re: Playing notes under the tuning frequency

    Quote Originally Posted by CKY
    This question still troubles me
    I did some research, which included opening a couple of songs and finding out that they contain large portions of low notes (8,20,25hz,etc.). Notes under tuning frequency are bad for ported subwoofers , right ?

    the thing is that i know A LOT of people with ported boxes and they don't have a clue about their tuning frequency (it's a high one anyway) , yet that don't have problems even playing bass tests and all kind of subwoofer beaters

    Irrelevant , but i asked my local car audio shop about this and they had no idea , "we never heard of that problem"

    So .. bass tests that have peaks at 20,30 for example can destroy a sub in a ported box with a let's say , 35Hz tuning freq ?
    Yes, you can very quickly reach the mechanical limits of a sub below its tuning frequency, which is exactly why subsonic filters exist (SSF). A sub is essentially reaching free-air below its tuning frequency (correct me if i'm wrong), and sending a large amount of power with no enclosure to aid in the control of the speaker, you are asking for surpassing the mechanical abilities of the sub.



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    Re: Playing notes under the tuning frequency

    there are alot of reasons behind this.
    one of the easiest to accept is prolly: because of impedance rise in box you dont have to worry very much about it unless you are sincerely overpowering your woofer. also depends on port area in realtion to vB. when a ported unloads the woofer, it IS bad for the woofer. but not usually catastrophic, or even causing failure. But if you want the woofer to last, especially often exposed to at/over limits in box... trust me, it goes on. the geniuses here will chime in.



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    Re: Playing notes under the tuning frequency

    ok lets start off with the simple stuff.

    sub power handling is box dependent correct? so a small box requires the sub to need more power to reach its Xmax. while a large box requires less power.

    so you have a ported box tuned to 35 Hz the closer the subs plays to that level the more efficient it becomes. (kinda like the box is getting bigger) if you go below that level the sub starting acting as if it is not in a box. which anyone will know freeairing a sub doesnt produce alot of bass and will end blowing the speaker....

    anyone else want to add anything?

    other than that some shops are just plain stupid?



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    Re: Playing notes under the tuning frequency

    taking a look at a plot of Xmax vs. frequency will make this pretty obvious...




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    Re: Playing notes under the tuning frequency

    Quote Originally Posted by Jack Frost
    taking a look at a plot of Xmax vs. frequency will make this pretty obvious...
    bingo



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    Re: Playing notes under the tuning frequency

    Hmm.... so the company that produces the subwoofer states in the manual a max. volume for a ported box ... let's say they specify a 1,6 to 1.8 cu.ft. ... they never say anything about tuning freq.

    Isn't that max. volume specified so that below it you won't have problems "playing music with bass" (for the regular buyer) ?




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    Re: Playing notes under the tuning frequency

    Something like that...




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    Re: Playing notes under the tuning frequency

    Quote Originally Posted by CKY
    Hmm.... so the company that produces the subwoofer states in the manual a max. volume for a ported box ... let's say they specify a 1,6 to 1.8 cu.ft. ... they never say anything about tuning freq.

    Isn't that max. volume specified so that below it you won't have problems "playing music with bass" (for the regular buyer) ?
    Box size was just an example. they go together. A 1.8ft^3 box tuned to 35hz will play like a 1.8ft^3 box with a 35hz note. The lower you go than 35hz the more stress is imposed on the sub as if playing in a larger box. So the box size recommended is fine. Its the tunning they leave up to you.



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    Re: Playing notes under the tuning frequency

    Quote Originally Posted by CKY
    Hmm.... so the company that produces the subwoofer states in the manual a max. volume for a ported box ... let's say they specify a 1,6 to 1.8 cu.ft. ... they never say anything about tuning freq.

    Isn't that max. volume specified so that below it you won't have problems "playing music with bass" (for the regular buyer) ?

    more or less.
    if you'll notice, alot of "mainstream" (eek) companies dont recommend boxes near the drivers vas... however, one of the (many) aftermarket rule of thumbs is to use this figure.
    also relates to the "smaller vB = higher rms (mechanical not necesarily thermal)...
    Like he said, tunig is up to you. The "good" companies will give some recommendations though.



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    Re: Playing notes under the tuning frequency

    Hmm , okey. Let's take me for example , i'm closest to a noob
    I have an Alpine Type R 12" , and i want it ported because it's my first system , i dont have a SQ ear yet , i want a full-power setup.

    I open the manual , i see the VAS spec of 2ft^3.
    Do a bit of research on the forums , decide to go with a 1.52ft^3 ported box.

    Tuning frequency ? Nothing in the manual.
    So i go to my local shop and get them to build me the box. They "never heard" of under tuning frequency problems , and they will install a good looking Emphaser port which comes to around 45Hz tuning.

    Let's say that i get my box , wire it up , bump it to a couple of bass tests and bang, blow my sub ?

    Not my case though , i will build my port tuned to 35 , but after reading all of this i think of going with 32Hz ...




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    Re: Playing notes under the tuning frequency

    Bump ... it keeps buggering me , you know




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    Re: Playing notes under the tuning frequency

    32hz sounds good to me.......dont do 45 hz unless you are making an spl box, or never ever play rap music





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    Re: Playing notes under the tuning frequency

    2x to what Josh said. 32 will work perfect. 45 is to high for daily driving. Not only will it sound quite bad your SSF will cut into some of the lower notes and you will lose your low end.




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    Re: Playing notes under the tuning frequency

    Nah, i will go with a max. 35 Hz ...

    Not only will it sound quite bad your SSF will cut into some of the lower notes and you will lose your low end.
    I don't have a SSF , and i don't have a place to buy one ...




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