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gsxr1000

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I don't think that graph is accurate, at least not as far as the threshold of pain is concerned below 40 Hz or so.

It is. It's differential (dB), not absolute (dB SPL). To get absolute, add 8 dB to any number pulled from the chart.

I've been in my son's mini-van when it hit 150 dB@34Hz measured with a calibrated termlab. It's not that bad.

With your ear up against against the windshield, where the mic was??

I wager that most folks would not share that same sentiment. [:S]

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         TABLE G-16 - PERMISSIBLE NOISE EXPOSURES (1)
______________________________________________________________
|
Duration per day, hours | Sound level dBA slow response
____________________________|_________________________________
|
8...........................| 90
6...........................| 92
4...........................| 95
3...........................| 97
2...........................| 100
1 1/2 ......................| 102
1...........................| 105
1/2 ........................| 110
1/4 or less................| 115
____________________________|________________________________
 
This is from OSHA website. I googled "government noise thresholds". In case anyone is interested. Based on this I wouldnt listen to music over 90db for any extended period of time. 

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this is why most reference levels are 85db - to be "safe" for all of our ears.

85db is pretty loud for regular listening. another reason why arguing if your amp puts out 90 or 110 watts is irrelevant. Most of the time we are only using a couple watts to produce 85+dbs. and someone please correct me but I for some reason thought bass frequencies do not techincally hurt your ears? or maybe it just takes such higher dbs compared to higher frequencies

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[With your ear up against against the windshield, where the mic was??

I was in the front seat, my head was about 2' from the mic.

I wager that most folks would not share that same sentiment. Tongue Tied

Most people there wanted a turn in the van, but it WAS an SPL competition.[:P].

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I was in the front seat, my head was about 2' from the mic.

In
my vehicles (a coupe and a sedan), the difference in measured SPL from
the driver seat and front passenger listening positions to the corners
of the windows (where the meters are typically adhered) was +10 dB
(about twice as loud) any where's between 60-80 Hz.

What I was
getting at, was that the SPL's where you were sitting were most likely
lower than what was being measured. Loud as heck regardless, but not
quite what was being recorded on the meter.

Next time your in the van, kiss your ears up against the windshield and run a test tone in the subs' pass band. There's a lot more pressure change up there against that surface than back at the seats.

..and get those kids up to Dyess for a couple of B-1 afterburner takeoffs without any hearing protection. Wandering around clinically deaf for the rest of the day, and bleeding from their ears should quench any wanton bass addiction. [;)]

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