Not proven #
Posted Wednesday 7th January 2009 00:35 GMT
In this case it is probably the peak level that is significant, and for peaks it is normally reckoned that there is not much risk below 140 dB. There will always be a few people that are unusually susceptible, but in this case the whole story seems to be based on one individual, and it is impossible to prove cause and effect in this way. People do get tinnitus for no obvious reason and it seems possible that it is a coincidence.
The original article did compare different clubs. However they describe their measurement as "sound impulse (dB)" which doesn't properly specify how the noise was measured. This is vitally important information as it can make a huge difference to the headline figure. If they didn't measure the true peak, the real value could be a lot higher, in which case the sound really could be a risk to hearing. It would not necessarily sound that loud because the sound only lasts for an extremely short time.


