A Design
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A Design EM blue

translates into “Highs” which will produce a much more airy top-end-ish tone. Used with a “dark” sounding microphone or a alto vocalist it can produce a “heavenly” sound.
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A Design EM gold

 more “up front” mids
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A Design EM silver

 good with “Ribbon Microphones” -
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A Design EEM-PEQ

Pultec EQP-1A