box designs

[Anwar ( Team Pi]

I have heard from time and again that the smaller the box the bigger the spl.

I have tried that and I always go back to my very first box.

Is this true. Because I find that the car starts playing at a higher frequency and it starts to shake rattle and roll...

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[IDSkoT 5,000+ posts]

No.

In a sealed enclosure, the smaller it is (in proportion to nominal space) the more abuse it can take. (I.E. take more RMS power than rated for longer.)

In a vented enclosure, the less air space is more pressure that the woofer is working against. Larger enclosures will produce higher numbers, but risk over-exerting the driver, as well as over-working the coil.

 

[DBBOOM 10+ year member]

You want Spl, you tune the box higher than normal, if thats what you mean. Usually a box is tuned somewhere in the 30-38Hz range, for music. In spl, its usually higher than that.

 

[RAM_Designs 5,000+ posts]

Smaller boxes are used because you can throw more power at the sub(s) without it overexcurting. Try putting 3kw to an 18" SX in a 7ft^3 ported box and you'll see that it'll overexcurt very easily. Now put it in 2ft^3 and put that same 3kw to it, and voila, you're fine(generally speaking).

Obviously, this is a very simple way of explaining it.

 

[Anwar ( Team Pi]

thanks guys.

i am currently in the stock one class. playing duel two with 2 5000z doing a 155.9db

i need help to get to the 157 mark.

this means changing my box...

 

[IDSkoT 5,000+ posts]

Smaller boxes are used because you can throw more power at the sub(s) without it overexcurting. Try putting 3kw to an 18" SX in a 7ft^3 ported box and you'll see that it'll overexcurt very easily. Now put it in 2ft^3 and put that same 3kw to it, and voila, you're fine(generally speaking).
Obviously, this is a very simple way of explaining it.

I love words like 'generally.' Just to cover our ass in case ish goes bad.

 

[Pyro_By_Nature 5,000+ posts]

No.In a sealed enclosure, the smaller it is (in proportion to nominal space) the more abuse it can take. (I.E. take more RMS power than rated for longer.)

In a vented enclosure, the less air space is more pressure that the woofer is working against. Larger enclosures will produce higher numbers, but risk over-exerting the driver, as well as over-working the coil.

Please do not take about what you do not know, we're talking SPL here............ And besides, a sealed box won't increase thermal power handling, so it won't magically make the sub take it's RMS for "longer". You just have good cone control.

The loudest box I ever used in my street C set-up was a hair over 3 cubes for 2 15's //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif It all depends on the application.