Would two 12K's be much louder than what I have now?

[Bobyota 10+ year member]

I have two old Kicker C-12's now. They have a 7mm xmax, and the K's have a 16mm. That's the only addvantage I can see on paper that would make the K's louder. They'd be used in the same box and recieve the same power (300 a piece).

I've read doubling xmax is worth 3 db....so am I only looking at about 3 db more here? I'm guessing there are other variables that I don't know about. What do ya think?

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[alove_85 10+ year member]

I think 3 dbs makes your music twice is loud. Correct me if im wrong

 

[Bavarian3 10+ year member]

naw 10db is twice as loud. but u wont really a huge difference going from comps to K's.

 

[nswartley 5,000+ posts]

it will be considerably louder...and sound better with the right amount of airspace. i wouldnt hesitate to pick them up...

and yes 3db is 2x as loud.

 

[Bavarian3 10+ year member]

it will be considerably louder...and sound better with the right amount of airspace. i wouldnt hesitate to pick them up...
and yes 3db is 2x as loud.

i couldve sworn i read somewhere that 10db is twice as loud....

 

[nswartley 5,000+ posts]

i couldve sworn i read somewhere that 10db is twice as loud....

its 3...or theoretically it is. 10db is way high...

-nate

 

[Gauntlet 5,000+ posts]

[quote name='Jmac in some random thread where he throws out random numbers to prove his genius //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif]Early acousticians came up with a simple method of comparing two sounds. A sound that was perceived to be twice as loud as another sound was said to be one Bel greater in sound level. The Bel was used as a unit of COMPARISON' date=' not a unit of measure. Its namesake was Alexander Graham Bell, a pioneer in the science of audiology (the study of human hearing). It soon became apparent that this unit of comparison was not very accurate in describing the difference between two sounds very similar in level. A smaller unit of comparison, the decibel, was established. One decibel is defined as being equal to one-tenth of a Bel; the prefix "deci-" is a French derivative that means "one-tenth", as in decimal, etc. Since a decibel is one tenth of a Bel, then 10 decibels would equal one Bel. In other words, a sound that is twice as loud as another sound could be described as being 10 decibels or (10 dB) louder. By definition, one decibel (or 1 dB) represents the smallest change in sound level that the human ear can perceive.

+1 dB = 7% louder

+2 dB = 15% louder

+3 dB = 23% louder

+4 dB = 32% louder

+5 dB = 41.5% louder

+6 dB = 51.5% louder

+7 dB = 62.5% louder

+8 dB = 74% louder

+9 dB = 86.5% louder

+10 dB = 100% louder (Twice as loud)

+11 dB = 114% louder

+12 dB = 129.5% louder

+13 dB = 146% louder

+14 dB = 164% louder

+15 dB = 183% louder

+16 dB = 203% louder (~Thrice as loud)

+17 dB = 225% louder

+18 dB = 248% louder

+19 dB = 273% louder

+20 dB = 300% louder (Four times louder)

[/quote']

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[nswartley 5,000+ posts]

//content.invisioncic.com/y282845/emoticons/frown.gif.a3531fa0534503350665a1e957861287.gif

i used to ALWAYS see people sayin 3db is 2x as loud.

im wrong so SHOOT ME!!!

-nate

 

[Bobyota 10+ year member]

Well JMAC was the one that told me 3db was 23% louder and I had heard before that it was twice as loud.

Jmac, if you read this, what's your take on my situation?

Thanks guys //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif

 

[street_accord 10+ year member]

I had talked to a tech at a local shop and he said that 3 dB wouldn't double the loudness...he said that it would be around where you would realy start to notice a good increase.

Bobyota...you can also gain a lot in box design, maybe something you could look into IMO.

 

[nswartley 5,000+ posts]

go with the Ks bro...

how much airspace do you have with the box you have right now? .75ish per chamber should be sufficient...

-nate

 

[Bobyota 10+ year member]

I have a 4ft box, so they'd have twice what ED recomends. Only thing I can think that would also help spl is porting this box. But I would want a low porting like mid 20's. People say to port higher for more spl, so I may not gain a whole lot by porting. Also, I'd loose a lil airspace by porting this box, and I can't get a bigger box to fit. So that seems like a small lose to me. I'm sure SQ would be many times better, but I'd really like a decent jump in spl too....not so sure I'll get it.....

 

[street_accord 10+ year member]

That's 4 cu. ft. sealed? Is that before or after displacement? BTW, eD recommends between 1.2 and 2 cu. ft. per 12K ported...their blueprints are for 1.5 tuned to 28 Hz. If you go ported, I'd recommend building a new box for them, not just porting an originally sealed box.

 

[Bobyota 10+ year member]

It's about 4.25 before displacement. The shape of this box is about the only one I can fit, that's why I wanted to port this box, plus it'd be a lil easier and is already about the size the recomend.

 

[street_accord 10+ year member]

If you do a good job of rebuilding this box with a port system it should fall right into the eD recommended specs, so your power should be no problem. I just don't know if porting this box is a good idea...it might be easier and better to just take the measurements and design the box with a port to begin with. That way you'll have the same fit, but with the port designed in from the beginning, not just tacked on later. Box design is one of the most important parts of sub performance, a little extra now might pay off more in the long run.