[jjb]

thre's lots of recommendations on the max sound pressure level (spl) you should expose your ears to, and for how long, before it could result in hearing damage. But how do you tell, even approximately, what spl you are at while listening to phones ?

JJB

 

[fatcat28037]

I've wondered about this myself. I resently purchased a Galaxy CM-130 SPL and am hoping I can use it to test the volume level of my phones. What I thought of doing was put the phones on and adjust the volume to the level I like to listen, then remove the phones and hold the meter next to the ear pad were my ear would normally be. My problem is I don't know if this would be accurate or even reasonable. Can anyone help?

 

[apnk]

I do it like this:

 

[fatcat28037]

Quote:

Originally Posted by apnk /img/forum/go_quote.gif I do it like this:

Thanks.......Question about the cardboard. Is there a reason to use heavy corrigated board? I'm thinking thinner, say poster board, would give a more accurate reading.

 

[GreatDane]

Quote:

Originally Posted by fatcat28037 /img/forum/go_quote.gif Thanks.......Question about the cardboard. Is there a reason to use heavy corrigated board? I'm thinking thinner, say poster board, would give a more accurate reading.

I don't think it will matter much what type of material is used although I don't believe poster board would be more accurate...use whatever seems to work best for you.

 

[jcx]

some sort of coupler is necessary, non-resonant and able to get equivalent fit/seal to cans ear cups

if you wnat to go a little further you can make a chamber of specific volume between the flat and the mic diaphram

I drilled out a block of wood to fit over my workplace' sound pressure meter's long snout - the snug fit also sealed the mic - coupler path too

with a calibrated AC Volt meter and function generator I was able to verify my setup was reading ~2 dB low compared to the manufacturer's specs for several headphone's as calculated from the drive V and sensitivity #'s

 

[Skylab]

I drilled a hockey puck, works perfectly for Beyer cans or any of that same approx size.

 

[Clutz]

I think that using something like a hockey puck, like Skylab did, is better than going with cardboard. The cardboard is going to absorb some amount of the sound pressure, which means that the measurement you will get using cardboard will be a minimum estimate, not a maximum. You want something that isn't going to resonate or flex very much with increasing volume, and cardboard - no matter how stiff, is going to.

 

[jjb]

Very interesting....anyone have thoughts on how to build a rig like this for IEM's i.e. Etys ??

 

[fatcat28037]

Quote:

Originally Posted by Skylab /img/forum/go_quote.gif I drilled a hockey puck, works perfectly for Beyer cans or any of that same approx size.

Great idea.............now where do I find a hockey puck in the south?

 

[Skylab]

http://www.49cent-puck.com/shop/ice-...key-pucks.html