dB vs Hz

[Aqeeb127]

Is it true the higher the hz the easier to make a higher db

 

[chris661]

Generally, yes. For every octave down you go, you need to move 4x as much air.

Chris

 

[Gioba]

Is it true the higher the hz the easier to make a higher db

I'm not sure what you mean, see "Fletcher and Munson" diagram.

 

[Aqeeb127]

Gioba i mean the higher the frequency the easier to create a higher spl number

 

[Aqeeb127]

So you saying i can double my db if i go a octave up

 

[Gioba]

Gioba i mean the higher the frequency the easier to create a higher spl number

Generally yes, but until 4 KHz circa, then in the highest frequencies the dB goes down again (like diagram about psycoacustic).
The increase of spl not depend from superior octave only, but from speaker response also, i think.

We must to understand which is your test or what you want to do.
I don't know if you can double the spl with a octave up, i don't think, it means a straight line in the diagram.

 

[Aqeeb127]

I meant gain at least 3db by going up

 

[Aqeeb127]

I want to build a enclosure that will give the highest spl number these woofers can do

 

[picowallspeaker]

Probably you're talking about size/efficiency/bandwidth that are linked each other.
It has nothing to do with box size in terms of SPL.

 

[picowallspeaker]

Or you are referrring to the fact that nowadays we see lots of high efficiency speakers in cars, because they produce a little more SPL for the same given power: that's because, yes, they have higher Hz (?!?!?)...higher Fs which is the resonant frequency of the speaker, compared to normal speakers. But the high efficiency is given by the big motor!

 

[Gioba]

I want to build a enclosure that will give the highest spl number these woofers can do

I'm sorry, i cannot aid you in this case, but you can consider to double power of the sub for to gain +3dB.
And for SPL you can use a class D amp and get high power.

 

[tsmith1315]

Duplicate thread here:
SPL Box

The OP apparently has an amp in the 1kW range and 12" woofers.

He wants to achieve the highest SPL that he possibly can for a local dB drag type contest. Fidelity is of no concern in these situations, only to register the highest number on the SPL meter. Most likely using a pulsed signal, not steady-state. Exciting a mode for huge one-note resonance is key to winning.

 

[Perry Babin]

For one note with the highest gain, a bandpass enclosure may be the best (but not a simple) option.

 

[picowallspeaker]

Exciting a mode for huge one-note resonance is key to winning.

Yes, I saw that crazy...
If it's raw SPL, I'd be much concerned in what's behind the speaker, the body of the car etc. Imagine how many losses from the holes and the pressure
( To OP: you must have problems, seriously. Calm down and search for quartets/quintets with violins, violas, cellos, pianos, harpsicord, harps, flutes etc in gardens, verandas )