API Audio The Channel Strip - Manual (Page 33)

APPENDIX
i.
512C Preamplifier Specifications
ii 527 Compressor Specifications
iii. 550A Equalizer Specifications
iv. 325 Line-Driver Specifications
i. 512C Preamplifier Specifications
Rear Connector: XLR MIC Input
Balanced ¼” TRS LINE Input
Front Connector: HI-Z ¼” Unbalanced Instrument Input (INST)
Gain Range: MIC: 14dB min. 68dB max.
INST: 14dB min. 50dB max.
Maximum Input Levels: MIC: +8dBu
INST: +36dBu
Input Impedance: MIC: 1500 Ohms (150 Ohm mic)
INST: 20 K Ohms
Clipping Level:
+30dBu
Output Peak Indication: +27dBu
Frequency Response: +0, -.3, 30Hz to 20kHz
Noise:
Equivalent Input Noise: MIC:-129dBm; INST: -125dBm
Actual Metered Noise: MIC: -95dBm; INST: -90dBm
Distortion: Less than .05% @ +4dBu out, Less than .1% @ +28dBu out
ii. 527 Compressor Specifications
Attack Times: 1 millisecond to 25 milliseconds (typical)
Release Times: 0.3 seconds to 3 seconds (typical)
Compression Ratios:
1:1 to ∞:1
Threshold Control Range: +10dBu to -20dBu
THRUST® Filter: -10dB/Decade slope, unity @ 1kHz
Frequency Response: +/- 1dB 20Hz to 20kHz
Total Harmonic Distortion: < .2% THD, any level below clipping, any compression setting
Signal to Noise:
Unweighted -100dB below clipping
([email protected]% distortion, no compression)
Metering: 10-segment red LED: Gain Reduction scale; -1.5dB to -23dB
(negative illumination indicator)
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