API 2500 Operator's Manual page 14

HARD: Sharp response curve
• Immediate onset of compression (sudden transition to set ratio)
• More aggressive and noticeable
• The red LED illuminates when engaged
MED (Medium): Slightly rounded response curve
• Moderate onset of compression (firm, but less sudden transition to set ratio)
• Less aggressive and but still noticeable
• The yellow LED illuminates when engaged
50 th Anniversary 2500 Bus Compressor
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API