Specifications

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Grey
Compared to White, the Grey voicing provides a 1 dB low-frequency boost with a
gradual high-frequency roll-off, reaching 4 dB at 10 kHz.
Blue
The Blue voicing provides a more significant 2 dB low-frequency boost, coupled with the
same high-frequency roll-off as Grey, but with 2 dB more mid-frequency attenuation
from 700 Hz to 8,000 Hz.
This voicing is most suitable for high-SPL performances with significant upper-mid
content. The more extensive mid- and high-frequency attenuation is sometimes useful
to combat fatigue with midrange-heavy instruments, as the ear is most sensitive to this
range of frequencies.