Decibel Questions

[IDSkoT 5,000+ posts]

JL jigawatts are so crazy you cannot predict their Dbeez, you just know they's gonna be loud

Fixed.

 

[skateboardkid 10+ year member]

Wow why did i think i could get this answered from you idiots?

geee I wondered that myself, the answers are entertaining for sure.

In theory twice the cone area is 3dbs with same power - twice the power is 3dbs as well, so 3 Dbs per extra set of woofers at the same wattage - something like 7 setups to get you to 120 Dbs, however the doubling of pressure is exponential so startign at 100 db's it should be cake - start at 140 and add 20 Db's and your math might be off some. - I know mine is - feel free to sig and make fun of me you fvcks.

 

[cotjones 10+ year member]

wtg for making a train wreck of a legitimate question morons:wow:

 

[James Bang 5,000+ posts]

God ur thick!

that's what she said...

 

[cotjones 10+ year member]

geee I wondered that myself, the answers are entertaining for sure.
In theory twice the cone area is 3dbs with same power - twice the power is 3dbs as well, so 3 Dbs per extra set of woofers at the same wattage - something like 7 setups to get you to 120 Dbs, however the doubling of pressure is exponential so startign at 100 db's it should be cake - start at 140 and add 20 Db's and your math might be off some. - I know mine is - feel free to sig and make fun of me you fvcks.

I'm pretty sure the 3db gain is only when you are talking about going from 1 sub to 2... doubling the output gives the 3 db increase doubling the output again would take 4 giving a total of 106db... lets just make a chart... keep in mine all subs taking same power, enclosure, air space etc.

1 sub = 0db gain (100db's)

2 subs = 3db gain

4 subs = 6db gain

8 subs = 9db gain

16 subs = 12db gain

32 subs = 15db gain

64 subs = 18db gain

128 subs = 21db gain (121 db's)

so of course the numbers are rough but that is how it works? so this work too:

4 subs = 0 gain (100dbs)

8 subs = 3 gain

16 subs = 6 gain

32 subs = 9 gain

64 subs = 12 gain

128 subs = 15 gain

256 subs = 18 gain

512 subs = 21 gain (121 db's)

right?

 

[02parkave 5,000+ posts]

Update on the italian superchip?

 

[tommyk90 5,000+ posts]

Jesus Christ.

Who let this guy back in?

 

[terra 5,000+ posts]

That italian chip still workin?

 

[cotjones 10+ year member]

Jesus Christ.
Who let this guy back in?

Its a simple concept moron...does the 3db gain rule only apply to a base of 1 source (starting with 1 sub as a reference) or is the reference point irrelevant to the concept?

 

[tommyk90 5,000+ posts]

Its a simple concept moron...does the 3db gain rule only apply to a base of 1 source (starting with 1 sub as a reference) or is the reference point irrelevant to the concept?

It's a simple concept that is absolutely untrue in the real world.

THEORETICALLY yes you should gain 3 db for doubling your cone area, and same for doubling power.

However, that theory falls flat on its face once it's applied to a real world environment such as a vehicle.

There's far too many variables involved for such a simple theory to actually hold true. That's why it's called a theory and not a fact.

 

[cotjones 10+ year member]

It's a simple concept that is absolutely untrue in the real world.
THEORETICALLY yes you should gain 3 db for doubling your cone area, and same for doubling power.

However, that theory falls flat on its face once it's applied to a real world environment such as a vehicle.

There's far too many variables involved for such a simple theory to actually hold true. That's why it's called a theory and not a fact.

alright, listen carefully...

MY FIRST SENTENCE IN THIS WHOLE **** THREAD WAS "THIS IS COMPLETELY THEORETICAL", DIPSHIT!

 

[appleyard 10+ year member]

You do realize that SPL is about pressure level of air in an enclosed environment. Also cone area does have marginal effect in dB level . It does not mean that each time you double cone area you will have 3dB's gain.

And whats up with the attitude?

 

[tommyk90 5,000+ posts]

alright, listen carefully...
MY FIRST SENTENCE IN THIS WHOLE **** THREAD WAS "THIS IS COMPLETELY THEORETICAL", DIPSHIT!

Ok, so your post has been answered by numerous people, what more are you looking to find out?

It's a theory, who cares if it actually makes sense or holds true.

Hell, you even answered the question yourself. Obviously you should know that it won't take 512 subs to gain 20 db over 4 subs. There is a point of diminishing returns there.

On top of that, the decibel levels you suggested are unrealistic as well. I've seen stock stereos do in excess of 120 dB. Also, the higher the decibel levels, the harder it is to gain by adding more cone area/power. This is evidenced in extreme vehicles. More does not always = better.

 

[cdcooper]

if a tree falls in the middle of the forest with no one around. Does it make a sound?

Yes, it makes a sound, all the animals in the forest can tell you it did, or do you think some trees are suddenly surrounded by a Vaccum when the fall? Still have doubt, cut the tree down yourself and record it for the rest of us.

As I remember at any given point, you have to double the power to gain 10 db in most systems, but this depends on how efficient your amp and subs are.

My goal was to create a system that would do 140db clean. Why? even at that level you do hearing damage over time so if you can do 140 clean, then 130 from the same system would be even cleaner. 120 cleaner still and really friggen nice to listen to.

140 db is what is sounds like 100 ft. back from a 747 engine on take off.

150 db WILL cause instant permanent hearing damage. Yea good for sound offs and getting the loudest, but what's the point, you can't listen to it.

 

[loudaccent 10+ year member]

a stock radio does a 120. if i slam my doors i can probly do a 120