Sub isn't very loud, ways to make it hit harder?

[bigbang 10+ year member]

When I build a sealed speaker, I like to stick my head inside it and hum. I have a deep voice, and I find out what frequency the box eccentuates. Couple this to the subs resonant frequency and you can find a middle ground the sytem will likely be good at producing. Try humming in a 1 cubic foot and a 4. World of difference. Heck, stick your head in every box you find and hum away.:boobies://content.invisioncic.com/y282845/emoticons/boink.gif.91933e72f927f2cefc79aff02573090c.gif

 

[nauc 10+ year member]

i wouldnt feed it more power, its thermal power handling is only 300 so yould probably only get about 1 more db out of it

port it, its the cheapest way to get a lot more output

 

[Audio1]

When you place a woofer in a sealed enclosure it has a resononat frequency based on the size of the enclosure. The free air resonance is the specification when it is not restricted by a certain enclosure volume.

Below are the Thiele Small parameters and the results for a 12w3v3-4.

Data Input:

Speaker's Resonant Frequency (fs)? 26.72 Hertz

Qes? .472

Qts? .444

Qtc? .83

Vas?2.844 Ft3

 

Data Output:

 

Sealed Enclosure

3dB Down Point (f3) 43.6225 Hertz

Resonant Frequency (fc) 49.949 Hertz

Enclosure Volume (Vb) 1.14 Ft3

My point was that the current woofer that I am using has roughly 10 hertz lower resonant frequency than this Jl woofer in the same size enclosure. It does not mean that one will necessarily sound better in the vehicle as there are a lot of transfer fuction and other issues that can effect this.

Go directly to the PDF owners manual for this speaker on Jl's website and they also show this same resonant frequency (fc) specification. The size of the enclosure dictates the resonant frequency and the qtc.

So the enclosure volume for sure effects the resonance of any driver and is why the design principles that the engineers use when they design a speaker are so important when recommending air volume for a certain speaker.

 

[XanderMoser 10+ year member]

When you place a woofer in a sealed enclosure it has a resononat frequency based on the size of the enclosure. The free air resonance is the specification when it is not restricted by a certain enclosure volume.
Below are the Thiele Small parameters and the results for a 12w3v3-4.

Data Input:

Speaker's Resonant Frequency (fs)? 26.72 Hertz

Qes? .472

Qts? .444

Qtc? .83

Vas?2.844 Ft3

 

Data Output:

 

Sealed Enclosure

3dB Down Point (f3) 43.6225 Hertz

Resonant Frequency (fc) 49.949 Hertz

Enclosure Volume (Vb) 1.14 Ft3

My point was that the current woofer that I am using has roughly 10 hertz lower resonant frequency than this Jl woofer in the same size enclosure. It does not mean that one will necessarily sound better in the vehicle as there are a lot of transfer fuction and other issues that can effect this.

Go directly to the PDF owners manual for this speaker on Jl's website and they also show this same resonant frequency (fc) specification. The size of the enclosure dictates the resonant frequency and the qtc.

So the enclosure volume for sure effects the resonance of any driver and is why the design principles that the engineers use when they design a speaker are so important when recommending air volume for a certain speaker.

Thanks, I really appreciate you explaining it. I still have a lot to learn, there are a ton of terms that I sometimes get screwed up. I learn something every day.

 

[bigbang 10+ year member]

Resonance frequency is not the final say on a woofers low frequency aptitude. I read before that for comparing woofers for low frequency extenion you take Fs x (square root of Vas). Leave the result in Hz, in compare woofers in this method. Similarly, you use the results of this equation teamed up with your know enclosure volume to calculate F3 rolloff.