Electret and loud music

From a theoretical perspective it is entirely possible, a big enough compression wave (sound is one type) can break just about anything.

Almost certainly not. What more likely happened (if it did indeed occur at the same time) is that your friend got a wee bit too drunk and spilled her

Didn't get some kind of alcoholic beverege dripped into it, perhaps? :-)

"Richard Crowley" a écrit dans le message de news: snipped-for-privacy@corp.supernews.com...

I don't think so :-) My question was more to know what is the actual limit in decibel where an electret used in a mobile phone can be damaged by a very strong level sound exposure. Some people say it's 95 DB SPL which it seems low... A train or a truck can create louder noise.

Zeldus

OK, so maybe it was Diet Coke? ;-)

Probably, loud enough to physcially damage it in other ways.

I've looked at the spec sheets for mics like those in cell phones, and they specified marginally linear operation at something like 114 dB. That's not the point of damage, that's the 10% THD point.

Agreed.

A car with open windows and going 70 mph might generate LF sounds in the 130 dB range.

If not that, at least very high humidity from being surrounded by sweaty bodies? Electrets aren't best suited to humidity.

As for sound level, I'd have thought 95dB could easily be exceeded by shouting in to the phone, and most mics don't suffer distortion (never mind permanent damage) until much higher levels than that.

Anahata

Ask your friendly neighbourhood gangster - if gunshots don't damage a cell mic then nightclub music is unlikely to!

"A car with open windows and going 70 mph might generate LF sounds in the

Is it fair to say that skydivers may well have severely compromised LF hear>

well

HOPEFULLY they are wearing hearing protection, both ear plugs and the proection integral to their helmet.

Note that spending an hour or so in the back of a C-130 is probably worse for your hearing than the actual jump, but this isn't saying much.

--scott

"Arny Krueger" a écrit dans le message de news: eoqdnYVSpsl5ncfZnZ2dnUVZ snipped-for-privacy@comcast.com...

Thanks for the informations. And in a very loud sound condition (stronger than night clubs like industrial tools or guns shoots, higher than 130 DB), is there a risk of damage if the cell phone is switched off ? I mean is there a difference if the cell phone is on or off for the damage risk because of the sound conditions)

Thanks,

Zeldus

If it's going to get damaged it makes no difference whether the phone is switched on or off. The damage is purely mechanical.