![]() ![]() ![]() He is correct that they are A-weighted values, but they are actually LEQ values integrated over a 10 minute period. It depends on what country we're talking about, as many countries have far stricter Noise Regulations than the USA. Olson wrote on Thu, 10 September 2009 04:58 The crew and band, different story, but then they *should* be wearing ear plugs.īruce C. Screaming fans are not exposed daily to those levels. the OSHA standards are made for Occupational hazards. ![]() Quote:ĭBA Slow NIOSH (1998) 85 for 8 hours 90 for 2.5 hours 95 for 47 minutes 100 for 15 minutes dBA Slow OSHA (1998) 90 for 8 hours 92 for 6 hours 95 for 4 hours 97 for 3 hours 100 for 2 hours 102 for 1.5 hours 105 for 1 hour 110 for 1/2 hour 115 for 1/4 hourĪlso, another point. If your signal is flat 20-20k then the power loss is about 5dB with no weighting and about 4dB versus C weighting. Since A weighting is band limited 800 to 8k roughly (-3dB) it covers approximately 3.3 octaves. Given a full range signal, every band pass will have an apparent loss in power. Measured power is dependent on bandwidth. One thing to remember is that just because the C weighting results in a higher SPL reading, doesn't mean that the bass is out of wack WRT the mids or highs. Most would not have the slightest idea that at the frequency of the low B on a bass guitar, the difference is about 35 dB between A and C scale. During fair season I find myself reeducating engineers on an annual basis that have forgotten the difference. As to what scale and speed is used for SPL readings, over the years, I have found that most engineers have had only a vague idea of the difference between scales. It's all relative, and shaking guts are not an absolute requirement to please an audience. If you mix at 85-90 dBA, 100 dBC can sound fat, 107 dBC would be way fat. Consider that the more mid/ hi level you mix at, the more LF you need to keep up. Believe me, I have the notch to prove it. Evan, you and the screaming girls are causing hearing damage at 108 dBA slow, however good you think it sounds. If you didn’t switch to show the house guy the difference, he was probably ASSuming the meter was on “A” scale. Ryan, if the level did not change between A and C scale, it was loud at 107, especially if “slow”. Art Welter wrote on Wed, 09 September 2009 15:39 ![]()
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