Originally posted by: JonnyBlaze
thats my kind of system!
wonder how many db's hes hitting. the loudest i ever sat in was 153db.
i biggest system i ever built myself was 4 10" eclipse's running off 2 older fosgate punch 200's and mb quarts for fronts & rears.
it was in a 73 porsche 930 turbo. those things hit lout and perfectly clear in that small car.
JB
And how long did you sit in that 153db?
The accepted threshold of pain is 120-130db. Instant deafness can occur at 150db.....akin to standing behind an operating jet engine at 3m.
Decibel (dB)
(1) a logarithmic scale used to denote a change in the relative strength of an electric signal or acoustic wave. It is a standard unit for expressing the ratio between power and power level. Using the logarithmic relationship for power PdB = 10*log[Pout/Pin] , a doubling of electrical power only yields an increase of +3 dB. Increasing the power tenfold will yield an increase of +10 dB and is a doubling of perceived loudness. The decibel is not an absolute measurement, but indicates the relationship or ratio between two signal levels.
(2) SPL (sound pressure level) can be measured in dB. 0 dB represents the threshold of normal human hearing, 130 dB represents the threshold for pain, 140 dB causes irreparable hearing damage, and 150 dB can cause instant deafness, anything greater than about 192 dB can kill you.
Table B.1: Approximate dB-SPL level of common sounds.
(Information from S. S. Stevens, F. Warshofsky, and the Editors of Time-Life Books, Sound and Hearing, Life Science Library, Time-Life Books, Alexandria, VA, 1965, p. 173.)
Sound dB-SPL
Jet engine at 3m -- 140
Threshold of pain -- 130
Rock concert -- 120
Accelerating motorcycle at 5m -- 110
Pneumatic hammer at 2m -- 100
Noisy factory -- 90
Vacuum cleaner -- 80
Busy traffic -- 70
Quiet restaurant -- 50
Residential area at night -- 40
Empty movie house -- 30
Rustling of leaves -- 20
Human breathing (at 3m) -- 10
Threshold of hearing (good ears) -- 0
The soundoffs I've been to do not let participants sit in the cars because the db levels can peak over 150db, causing instant and irreparable hearing damage............only the db meter sits in the cars and the system is run by remote. I'd almost call BS on your statement.