Originally Posted by nvidiaftw12
Hmm. I'm used to much weaker ones.
Klipsch has some 111DB efficiency speakers but they're pricey.
Also, I always thought it was 10 more decibels, 10x the power. But maybe not. And that each additional speaker only netted one DB, not 3.
Roughly speaking, whatever you double gives you double everything else. If you want to double the power, you get +3db, or double the spl. If you want to double the SPL, you need to double the power. Doubling the surface area requires double the power to drive, but also results in another 3db.
I don't know the math on adding more speakers, but I am nearly positive that it doesn't flat out double the volume. I don't think it even results in much more volume at all. Don't bother using google and reading forums... it is full of idiots who think they can run like 75 speakers and get 300 db from 20 watts. Or people who are like "well you don't get double the SPL, but you do get +3db"... every 3db IS double the spl. Car stereo forums are almost worthless for this kind of information.
There is a nice calculator somewhere that lets you get estimated SPL levels from multiple speakers and different wattages and stuff. It assumes by default that if you add another speaker, you add corresponding wattage to it. If you say put in 2 10" speakers at 100w, then double the speakers.... it assumes again another 100w. If you cut the base wattage to 50 so the TOTAL is 100w, you will find the SPL is given as the same as the first two speakers at 100w. Simple fact is that you need to provide the power.
Doubling the surface area only helps increase a speaker's ability to produce low end frequencies at spl levels we can hear. For higher frequencies, the effect seems to be lost. Basically, you have to move more air around for the human ear to pick up lower tones more efficiently. This is why 10" subs have a really hard time hitting as low as a big 15".
At any rate, +3db = double the SPL (sound pressure level, which is basically a fancy version of db), which costs double the wattage. And peak power measurements are LOL.
It was always my favorite thing to roll around with this 600 rms sony xplod amp hooked up to two 15" MA Audio subs. They got loud as hell, people would be like "
DAMN MAN YOU GOT LIKE THREE THOUSAND WATTS BRO?
Or, if I told them I was running "600 watts", others would be like 'PFFT BRO THATS WEAK I RUN TWO THOUSAND" and then they show me their Pyle Audio amp, rated for something stupid like 2kw peak @18v x 1ohm with 10% THD... while they run 4 ohm speakers in series at 12.8v... Yeah, good luck with that 200 rms bro.
I facepalmed every time.Edited by Masta Squidge - 6/21/13 at 3:06pm