How do concert halls achieve good acoustics?

Sounds over 85 dBa can damage your hearing faster. The safe listening time is cut in half for every 3-dB rise in noise levels over 85 dBA. For example, you can ... Oct 22, 2018 ... You're safe if the sound in question stays below 85 decibels (dB); above that, you're in the action zone — protect your ears or risk hearing ... Jul 5, 2022 ... New VA Law Vehicle Exhaust Decibel Level 85 dB ... VA passed a new law limiting exhaust noise to 85 decibels at 50 feet measured by a calibrated ... Being exposed to noise levels higher than 85 decibels (dB) for long periods can damage your hearing. Most lab noise is well below this level, but it can ... Areas where noise levels have dropped below 85 dBA shall be eliminated from the monitoring program. Employees whose noise exposure levels no longer exceed an 85 ... Employee noise exposures equal or exceed an 8-hour time-weighted average sound level (TWA) of 85 decibels measured on the A scale (slow response) or, ... For example, the risk at 91 decibels over two hours is the same as 85 decibels over eight hours. Workers must not be exposed to a noise level above 140 decibels ... sound level (excluding impulse noise and alarm signals) shall be less than 85. dBA, regardless of time duration. [V2 6080] Intermittent Noise. Limits: for ... Mar 28, 2020 ... Everyone complains that 85 db SPL is too loud when they calibrate their home studio speakers but for me it seems like it's quite soft. Decibels are a logarithmic unit, which means that a noise measuring 30 decibels is actually two times louder than a noise registering at 20 decibels. ... 70 – 85 ...