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    Gilliz's Avatar
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    speaker & sub w/no box has no bass....why????

    hello,

    can anyone tell me why a speaker/sub has no bass when it is not enclosed??

    i heard something about how the waves cancelling each other out......but im not sure ...

    thx

    cw







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    Re: speaker & sub w/no box has no bass....why????

    Try to imagine a drum with nothing but the skin. or a guitar with no back. The enclosure is like a drum being hit.




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    Re: speaker & sub w/no box has no bass....why????

    from the way that it has been explained to me, this is what i understand...

    the box helps to contain the back wave coming off of the backside of the cone. in a sealed box it keeps the back wave from coming around and cancelling with the front wave. in a vented box the back wave is actually slowed down and alligned to positively interfere with the front wave.

    hope this helps to shed some light on it.




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    Re: speaker & sub w/no box has no bass....why????

    EXACT answer i was looking for ........

    thx alot man




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    Re: speaker & sub w/no box has no bass....why????

    no prob, its what we are here for




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    Re: speaker & sub w/no box has no bass....why????

    Theres more too it also. It can be explained in scientific terms by using phsyics.

    For every force exerted there is an equal and opposite force exerted as well. For instance, when a person pushes on a wall with a force of 100 N, the wall also pushes back on the person with the same force of 100N. Thus, when a sub moves back with a force of 100 N the air pushes back with a force of 100N, but the amount of air in an open space compared to the mass of the sub cancels out the sheer matter of the air is much smaller conatined to and open environment. Thus a force is pushed back onto the sub and sound waves can be pushed outward. In a ported box this works the same as the air bounces off teh back of the box and goes back to the sub while moving air out of the box also. Hope that helped if you could understand any of that




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    Re: speaker & sub w/no box has no bass....why????

    Quote Originally Posted by BumpinDoug
    Theres more too it also. It can be explained in scientific terms by using phsyics.

    For every force exerted there is an equal and opposite force exerted as well. For instance, when a person pushes on a wall with a force of 100 N, the wall also pushes back on the person with the same force of 100N. Thus, when a sub moves back with a force of 100 N the air pushes back with a force of 100N, but the amount of air in an open space compared to the mass of the sub cancels out the sheer matter of the air is much smaller conatined to and open environment. Thus a force is pushed back onto the sub and sound waves can be pushed outward. In a ported box this works the same as the air bounces off teh back of the box and goes back to the sub while moving air out of the box also. Hope that helped if you could understand any of that
    you're physics is a bit off........Newton's Laws do apply, but they have to be more specific in this case.......what it does have to do with is pressure and phase.....just as Hoss posted

    pressure is created on both sides of the cone, but one side is always 180 degrees out of phase of the other side, meaning when one is a compression, the other side is always a rarefaction.......and since a high pressure system always spontaneously tends to settle into a low pressure system, the high pressure on one side of the cone will spontaneously seek the low pressure side, ie: the back wave........so one wave has been pressurized a certain amount above atmospheric pressure (+1), and the other has been decompressed the same amount below atmospheric pressure (-1), thus canceling out and settling into a ground state of atmospheric pressure (+1-1=0)




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    Re: speaker & sub w/no box has no bass....why????

    doug, i think what you are trying to explain is the Q of the enclosure, not why ouput is increased when you put a woofer in an enclosure. it sounds to me like you are describing the "air-spring" effect. but as far as i know the force that a box imposes on a woofer does not have much of anything to do with output, other than the fact that a large sealed box will decrease output.

    edit: you beat me to it man




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    Re: speaker & sub w/no box has no bass....why????

    Ah ***you im never wrong!!!




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