tuning and resonant freq

[bigjsurdaddy]

can someone tell me how to tune a box and how to find the resonant freq of your car.

[Tooshort064]

1130/(2*FEET) where feet is the distance from front to back in feet

[bigjsurdaddy]

1130/(2*FEET) where feet is the distance from front to back in feet

which qeustion is that a answer to.

[Sanitarium]

which qeustion is that a answer to.

42

[bigjsurdaddy]

42

42? wtf

[edgar]

42? wtf

hmmmm i guess that means for two

for question 2

[BLuejoules]

uhh ok, dont know whats up with the other two guys but...

box tuning is determined by how big your box is, how big your port is and how long your port is.

(Im just making RANDOM numbers here for example) Now say I have a 2.5 cubic foot box and I want to tune it to 30 hz, and I want 15 sq inches of port per cubic foot; I would figure out how wide and how tall my port will be to get 15 sq inches of port per cube. Then I use a box calculator (like the one on the12volt.com) to figure out how long my port will need to be to make it 30hz. The longer the port, the lower the tuning.

If I forgot anything, let me know. Im half asleep right naw.

[Colin - STAPUFT]

1130/(2*FEET) where feet is the distance from front to back in feet

Resonant frequency of your vehicle.... but I dunno if that is the right equation or if it is the same as this:

Wave Resonance = 1130/feet/2

1/4 wave Resonance = 1130/feet/4

1130 is appx. the speed of sound (dependent upon height above sea level, humidity, temperature, etc...).

Feet is the distance from your speaker wall or box to your firewall.

So my van for example (i am guessing on my distance):

1130/7/2 = 80.72 hz (pleh! that is too high!) so... your quarter wave distance is:

1130/8/4 = 40.35 hz (ah ha!!! much better for burping- get subs and build a box accordingly)

Voila! Somewhere around in there - wet finger in the air - is where you should be loudest. So, if you want loud, tune your box a bit below that number and off you go.

[Boon]

For resonant frequency, seal your box and run a sweep on the termlab.

But if you don't know how to tune a box you shouldn't really be worrying about resonant frequency yet...

[bigjsurdaddy]

i'm getting ready to build my first lagit system. so i want to get it right. thanks for all the help guys, when i get the money for the rest of my system i'll be sure to post my pics or everyone. have a great day and keep the beats flowing.