OFF: Earplugs revisited

[John A Swartz]

>Does anyone know what frequency this is measured at?

I thought it was 1 Khz, but I'm not positive.  There was some literature
with Sonic II Noisefilters (the plugs I use - available at many music
stores - the ones that sell instruments, not records) that mentioned that
Sonic II seemingly have a low (i.e. not as good) rating due to the frequency
that the measurement is taken at, while in fact the attenuation at higher
(more damaging) frequencies is much greater.  1 KHz is not a particularly
high frequency -> note that 16 Khz, which is around the limits of human
hearing (depending on how many Metallica concerts you've been to) is 4
octaves higher than this.

Again, if you want a low-cost alternative to the high-priced plugs, and
don't like the "plugged up" feeling of ordinary earplugs or cotton, I
recommend Sonic II Noisefilters.

John