Overview - API 2500+ Operator's Manual

3.0 Overview

The 2500+ Bus Compressor provides a comprehensive suite of controls:
• THRESH (Threshold): The level at which compression begins (+20dBu to -20dBu)
• Threshold LED: Indicates when the input audio crosses the selected threshold level
• RATIO: The amount of compression applied after threshold
1.5:1, 2:1, 3:1, 4:1, 6:1, 10:1, and ∞:1
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• ATTACK: The time it takes for the compressor to respond
.03, .1, .3, 1, 3, 10, and 30ms
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• RELEASE: The time it takes the compressor to return to unity gain
Fixed Times: .05, .1, .2, .5 , 1, and 2 seconds
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Variable: 50ms to 3 seconds
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• KNEE: Sets the characteristic of the response curve at the onset of compression
HARD: Aggressive onset of compression
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MED (Medium): Moderate onset of compression
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SOFT: Smooth onset of compression
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THRUST
• ® : Activates the patented circuit that inserts a filter before the RMS detector
LOUD: Gradual, 10dB/decade filter
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MED: Slight low-frequency attenuation and a slight high-frequency boost
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NORM (Normal):
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• TYPE: Selects detection path routing
NEW: feed-forward detection path
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OLD: feedback detection path
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• L/R LINK: Sets the percentage of Left/Right control voltage link
IND (Independent): Channels operate independently of each other or
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Percent: 50, 60, 70, 80, 90 or 100% linkage between channels
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• SHAPE: Sets the speed of the Left/Right control voltage link
FAST: Peak acting: RMS control voltage influence attenuated
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SLOW: RMS acting: peak control voltage influence attenuated
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Both: Both peak and RMS link control voltage influence attenuated
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• MANUAL make-up GAIN: Selects MANUAL or automatic make-up gain
• GAIN: MANUAL make-up gain control (0dB to +24dB of output gain when MANUAL is engaged)
• BLEND: Selects output mixing mode: 100% compression, X=Crossfade, or
MIX: Sets the percentage of compressed signal and input signal sent to the outputs
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• IN: Toggles to switch gain reduction IN or out
• BYP (Bypass): Toggles to engage the hard-wire bypass
• VU (stereo VU meters): Stereo Left and Right analog VU meters
METER: Selects gain reduction (GR), output or input as the source for the stereo VU
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meters
2500+ Bus Compressor
THRUST
® filter not applied to side chain (flat)
8
l l=Parallel
API