Does power effect box volume?

[skittlesRgood]

The air in the box serves almost like a "spring." The larger your box the lower the "springiness" of the box. The "springiness" of your box helps to control the mechanical movement of your driver. So you have a coupled relationship between your box's efficiency and its ability to help control the movement of your driver. In short if you're putting more power to a sub you want to to make the box smaller to give your sub more mechanical control in that situation at the cost of a lower efficiency. A larger box does not necessarily give your sub more thermal power handling.

Let me grasp what was said. Efficiency means impedance rise or not? If so a smaller box will have a greater impedance rise while a larger box won't. So when it's all said and done. A 1k setup in a large box could be louder than a 3k in a small box. The large box will have a smaller rise than the smaller box. If this is the case, I might rethink getting the HDC3 and just stick with 1k on sdc2.5s

the answer is in what you have been told already. a big box will have less pressure inside of it, allowing the sub to travel easier (more efficiently). while a small box creates more pressure and is less efficient. there is always a happy median between the two that takes some time, or luck, to find.

put them in 2 cubes each. 12"s in general do quite well with that airspace. its a safe size if you only want to build once.

[skittlesRgood]

The smaller the box the greater the rise in most cases

in my testing I've seen the opposite.

[tdsa23]

The smaller the box the greater the rise in most cases

The smaller the box the greater the rise in most cases

in my testing I've seen the opposite.

Put money on it like last night

[ALPINE408]

The smaller the box the greater the rise in most cases

in my testing I've seen the opposite.

thats why i said in most cases in audio nothing is absolute.. i have seen it go both ways but for the most part smaller = greater rise

[bkolfo4]

So you build a smaller box to control excursion. Along with that, you lose efficiency and low end frequency response.

If it is a daily system, build the box to give you the frequency response you desire, and then power it accordingly. If you over power it, use the subsonic filter to control excursion.

Impedance rise vs box size will depend on the sub parameters, box size, tuning frequency, and the frequency you are playing when you measure the impedance. Measure a sub outside of the box playing at Fs and see how much "free-air" rise you get. . .

[MrSkippyJ]

and if I am not mistaken, box size does NOT effect thermal power handling.

[bkolfo4]

and if I am not mistaken, box size does NOT effect thermal power handling.

Ported it shouldn't, but some will argue that it does in sealed.

[mrd6]

It can affect thermal power handling in a ported box in the aspect that changing enclosure size changes the amount of movement the sub experiences at a certain frequency, some cooling is directly related to coil/cone travel

Edit: this is usually negligible except in rare circumstances and extremes however

[DubNDodge]

The smaller the box the greater the rise in most cases

in my testing I've seen the opposite.

The air in the box serves almost like a "spring." The larger your box the lower the "springiness" of the box. The "springiness" of your box helps to control the mechanical movement of your driver. So you have a coupled relationship between your box's efficiency and its ability to help control the movement of your driver. In short if you're putting more power to a sub you want to to make the box smaller to give your sub more mechanical control in that situation at the cost of a lower efficiency. A larger box does not necessarily give your sub more thermal power handling.

Let me grasp what was said. Efficiency means impedance rise or not? If so a smaller box will have a greater impedance rise while a larger box won't. So when it's all said and done. A 1k setup in a large box could be louder than a 3k in a small box. The large box will have a smaller rise than the smaller box. If this is the case, I might rethink getting the HDC3 and just stick with 1k on sdc2.5s

the answer is in what you have been told already. a big box will have less pressure inside of it, allowing the sub to travel easier (more efficiently). while a small box creates more pressure and is less efficient. there is always a happy median between the two that takes some time, or luck, to find.

put them in 2 cubes each. 12"s in general do quite well with that airspace. its a safe size if you only want to build once.

These two statements contradict each other don't they? I thought impedance rise meant the subwoofer was becoming less efficient. Because with rise, isn't it drawing less impedance from the amplifier? Or do I have it backwards?

[MrSkippyJ]

i should have said it doesn't effect power handling significantly 1k RMS subs don't magically become 2500K RMS subs because they are in a smaller box.