Ok i am a bit slow, is there some calculation given an amount of watts and sensitivty that tells you a theoretical max spl? For example I have SoundStream Tarantual series T4-15 with a 91db at 1 watt at 1 meter, and will be pushing those with a 2000 watt rm Picasso PCA200D amp also from soundstream. Without sitting there figuring out exponents (2, 4, 8, 16, 32, 64, 128,256,512,1024,2048) i know this because of computer programming lol. By my faulty calculations i would only hit around 124db. I think that is right, 11 doubles in power, 3db gain for a total gain of 33db added to a sensitivity of 91db = 124. However on 1000 watts and 2 10" in a ported box i hit 138.9 on a term lab meter (official meter of db drags) and the box was to small for the speakers, and the starting sensitivity was only 82. Something just don't add up, with 2 15"'s seeing 2000 watts i should be in the 145-150 on the term-lab meters.
anyone know how to figure out what the theoretical SPL should be. I use winisd and it says the same 124db, and only like 110db on my 10's.
anyone know how to figure out what the theoretical SPL should be. I use winisd and it says the same 124db, and only like 110db on my 10's.
ah.. a dB question ...
the formula for sound pressure level increase ,not power is db=20*log(p2/p1)so for example. if p2=say 100 watts, p1=1 watt, log of 100/1 is the same as log 100(essentially)=2, then 20 * 2 is 40, therefore total accoustical db =91+40=133
similarly 1000watts=:136 dBfor power db the formula is dB=10*10log(p2/p1)
this is with the assuption that Z=2 ohms total..not 1/2 ohm of course.
Q?: what does SS use for spl, 91 is posted but is that 2 Ohms (voice coils in series) or 1/2 ohm (VC in ll)?
also in house there may be as much as 9db "room gain" and upto 12 or 15 db "car gain"..as previously stated.
the formula for sound pressure level increase ,not power is db=20*log(p2/p1)so for example. if p2=say 100 watts, p1=1 watt, log of 100/1 is the same as log 100(essentially)=2, then 20 * 2 is 40, therefore total accoustical db =91+40=133
similarly 1000watts=:136 dBfor power db the formula is dB=10*10log(p2/p1)
this is with the assuption that Z=2 ohms total..not 1/2 ohm of course.
Q?: what does SS use for spl, 91 is posted but is that 2 Ohms (voice coils in series) or 1/2 ohm (VC in ll)?
also in house there may be as much as 9db "room gain" and upto 12 or 15 db "car gain"..as previously stated.
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