and Test Tones
Average price : less than $1 a pair, about $30 a 200-box.
NRR stands for Noise Reduction Rating. It is a standardized measure expressed in decibels (dB), and represents the overall attenuation offered by the earplug. The higher the NRR, the stronger the attenuation. Differences in the NRR of less than 3 dB between earplugs have no importance in practice.
ΔF represents an important factor for musical applications, as it measures the standard deviation from a spectrally flat attenuation between 60Hz and 16kHz. The smaller the ΔF, the higher the fidelity. ±3dB is virtually inaudible and can be considered as the very best one can get.
|At Home||•••||Great all-around earplug.|
|On the go||••||Great all-around earplug but industrial look|
|Industry||•••||200-box makes it very inexpensive. Industrial dispenser available. Requires clean hands to roll.|
|Music||•||Vivid color. Attenuation too strong. Spectrally not flat.|
Alternative : wax earplugs are more efficient in the very low frequencies but less convenient to handle.