When will doubling the power really add 3dB?

[Rawr-DQ 10+ year member]

3db is twice as loud

I was pretty sure 10db is twice as loud, not 3, if it was 3, then omfg 170+db

And I think double the power and double the cone cross sectional, you'll gain 6db...Theoretically.

But a 3 db gain, you're talking...+30% louder than what you were at (130%), 5db's, +50% louder (150%), 10 db, +100% louder, twice as loud, (200%)

 

[cotjones 10+ year member]

I was pretty sure 10db is twice as loud, not 3, if it was 3, then omfg 170+db
And I think double the power and double the cone cross sectional, you'll gain 6db...Theoretically.

But a 3 db gain, you're talking...+30% louder than what you were at (130%), 5db's, +50% louder (150%), 10 db, +100% louder, twice as loud, (200%)

no a 3bd increase is a 2 times as loud, a 10bd increase is 10 times as loud, a 20 db increase is 200 times as loud

 

[dipitydoo 10+ year member]

^^^not true. 3db is doubling of sound pressure or intensity. The human ear does not hear linearly, but rather logerithmically. 10db to the human ear is double the 'loudness'. Think of it as a measurement of pressure vs. perceived sensory input.

 

[phantom240 5,000+ posts]

no a 3bd increase is a 2 times as loud, a 10bd increase is 10 times as loud, a 20 db increase is 200 times as loud

Cotjones, I thought you were banned? Just shut up and listen, you obviously don't know a thing.

Even if it WAS sarcasm, we can't tell because you're so stupid.

 

[cotjones 10+ year member]

^^^not true. 3db is doubling of sound pressure or intensity. The human ear does not hear linearly, but rather logerithmically. 10db to the human ear is double the 'loudness'. Think of it as a measurement of pressure vs. perceived sensory input.

well as far as i was thinking, doubling the sound pressure is what is ment by doubling the loudness, you could be right but....

are you shure about that? i understand what you're saying but what doesn't make sence is that a human's perception of sound is different from frequency to frequency...

so does this mean that for a daily listenening system you should tune by ear instead of real time analyzer. or spl meter... beacause if actual sound pressure is different then percieved loudness than the only way to properly tune a system would be by ear

 

[cotjones 10+ year member]

Cotjones, I thought you were banned? Just shut up and listen, you obviously don't know a thing.
Even if it WAS sarcasm, we can't tell because you're so stupid.

umm ok so a 3dB increase isn't a doubleing of the sound pressure?

the math says that above 50 dbs, to double spl you go up 3 db's... others are saying that even though it's 2 times the pressure it doesn't sound 2 x as loud untill you go up 10 dbs

 

[Ninteens 10+ year member]

Yes I'm sure that you will notice a good difference going from 500 to 1000watts.

 

[cotjones 10+ year member]

**** ok i was wrong... i was thinking something else... i don't know or think that +10dBs is 2x as loud, but i was thinking power levels... so if you double the power you get +3 decibles.... x10 the power and you get +10dBs, x200 the power and you get +20dbs...

 

[Chevyaudio 5,000+ posts]

**** ok i was wrong... i was thinking something else... i don't know or think that +10dBs is 2x as loud, but i was thinking power levels... so if you double the power you get +3 decibles.... x10 the power and you get +10dBs, x200 the power and you get +20dbs...

I hope this was a joke...

 

[phantom240 5,000+ posts]

I hope this was a joke...

As do i.

 

[dipitydoo 10+ year member]

An RTA is a good tool to start with, because instruments can more accurately plot what's going on at all frequencies. This lets you narrow down major (or even minor) peaks/dips at various frequency ranges, some of which are difficult to notice by ear alone. In the end, final tuning by ear is preferred. A flat response on an RTA will almost always sound too plain for a daily system. A gentle downward hill type response is a good starting point.

I believe the 'difference' in loudness perception isn't as large on a frequency to frequency basis, but the 'sensitivity' of the ear varies pretty dramatically based on frequency. A 'frequency response' of the human ear might look somewhat like that of a component set of speakers - in the bass region, the ear gets less and less sensitive as the frequency goes down, hence a reason that a daily system might measure louder in the bass region vs. mid and high frequencies. Sensitivity will also drop at the top end of the frequency.

 

[Flipx99 5,000+ posts]

When I have no idea or have nothing to contribute, I just hit refresh. Cotjones has to cause a scene and scew up an otherwise useful thread.

What I want to know is how you can install to control DC Re, BL, and Cms (the factors in power compression)

I think before I can begin to "control" it, I must 1st learn how these characteristics work together (or not), and to ensure one does to reverse the other. (Such as building to make BL more linear makes DC Re increase)

 

[bdawson72 5,000+ posts]

When I have no idea or have nothing to contribute, I just hit refresh. Cotjones has to cause a scene and scew up an otherwise useful thread.
What I want to know is how you can install to control DC Re, BL, and Cms (the factors in power compression)

I think before I can begin to "control" it, I must 1st learn how these characteristics work together (or not), and to ensure one does to reverse the other. (Such as building to make BL more linear makes DC Re increase)

x2

 

[TheFiverMan 10+ year member]

**** ok i was wrong... i was thinking something else... i don't know or think that +10dBs is 2x as loud, but i was thinking power levels... so if you double the power you get +3 decibles.... x10 the power and you get +10dBs, x200 the power and you get +20dbs...

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[SPL140.2 5,000+ posts]

So, let em get this straight (I never really understood the effects of power compression) that power compression reduces the gains in output from a sub past certain power levels, and may actually reduce output?

say you have a generic 500 watt sub you put 1000 watts to it, depending upon the design of the sub and soft parts... you may reach a level where theres no more output, the subs still can take the watts but it doesnt get any louder. Example I used to use splw12's those b!tches could take some power but after a certain level, use this as an example, say 1200 clean watts no more output but they could withstand say 2000 clean watts all day. Those were some boat anchor subs. In my tests it actually never reduced output on the meter, just with more clean watts it never gained, I reached the power compression with 1200 clean watts.