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Tsikot Member Rank 4
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April 8th, 2007 11:42 AM #1Found this info. http://www.lowertheboom.org/trice/safedblevels.htm
Proposed safe sound levels:
85 dB and higher - prolonged exposure will result in hearing loss
90 dBA - no more than 8 hours per day (examples - lawn mower, truck traffic, hair dryer)
95 dBA - no more than 4 hours per day
100 dBA - no more than 2 hours per day (example - chain saw)
105 dBA - no more than 1 hour per day
110 dBA - no more than ½ hour per day
115 dBA - no more than ¼ hour per day (preferably less)
140 dBA - NO EXPOSURE TO IMPACT OR IMPULSE NOISE ABOVE THIS LEVEL (examples - gunshot blast, jet plane at takeoff)
The National Campaign for Hearing Health's Toxic Noise Guidelines (exposure times and decibel levels that cause hearing loss)
85 dB 8-hour period
85 - 90 dB 2-hour period
90 - 100 dB 1 to 2-hour period
100 - 110 between 2 and 15 minutes
110 - 120 less than 30 seconds
130 dB ANY EXPOSURE WILL RESULT IN PERMANENT HEARING LOSS
From http://www.lowertheboom.org/trice/decibels.htm
70 dB Negative responses begin in the body. The autonomic nervous system kicks in.
Noise over 70 dB Increases the risk of heart attack by 20%
Noise over 90 dB As this intense sound bombards the body, the adrenaline reaction is so powerful that people become openly hostile and belligerent.
120 dB Standing behind a Boeing 707 while it is in full thrust, just before takeoff. Hearing loss can occur after just 7.5 minutes.
120 - 130 dB Sound threshold for pain
120 - 140 dB Inside the average street boom car. Boom cars with higher levels are usually seen in dB "drag racing" competitions.
Based on the above info, I used a decibel meter on my car. Found out that my normal listening is around 87 decibels. Pushing it I was able to hit 100 decibels. At this point, my ears were already starting to hurt. Could have pushed it more but did not want to risk hearing loss. Should have used ear muffs.
Over all not bad for a system that only gets 50 watts per channel for the fronts and a single 10 inch sub fed only with 100 watts.
practice safe sound
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April 8th, 2007 03:56 PM #3
This should be a cause for concern, esp. for motorcycle riders like me...Just wind noise alone on freeway speeds is 90 db up. Include engine noise and endcan noise puts riders in toxic levels...that's why some people use noise suppressing earplugs.
I read in C! magazine that a Hyundai Santa Fe's cabin noise is at 82 db running 85 kph on asphalt. Pretty good...
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April 8th, 2007 03:57 PM #4
Which leads me to a question. What about high frequency soundwaves that aren't really that audible to us pero it can cause damage? I'm talking about ultrasonic frequencies such as those used in ultrasonicators or radiowaves, etc?
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Tsikot Member Rank 4
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April 8th, 2007 09:45 PM #5add ko lang.
Perceptions of Increases in Decibel Level
Imperceptible Change 1dB
Barely Perceptible Change 3dB
Clearly Noticeable Change 5dB
About Twice as Loud 10dB
About Four Times as Loud 20dB
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April 8th, 2007 10:26 PM #6
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April 8th, 2007 10:32 PM #7
I did a db check on my Pajero when the system was new. Even when playing loud, thumpin, music I was rarely exceeding 85db.
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April 8th, 2007 11:12 PM #8
eto kaya ok pa ba mga ganitong busina??
hehehehe!
http://www.youtube.com/watch?v=ZS1t1MQr9pQ
http://www.youtube.com/watch?v=BkJwcR21VLk
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April 9th, 2007 04:02 PM #10
I thought women didn't like low frequency sounds like bass? Parang there was a study about sound frequency and affinity with males/females. Males like the lower sounds kaya puro bass and loud exhaust notes. Women like the higher sounds kaya sensitive sila sa matinik na tunog.
the generic answer for all cars is, "yes but", i am wary of the increased glare that can blind...
2013 Mitsubishi Mirage