All specifications are typical performance unless otherwise noted. All specifications are subject to change at any time. Tested with Audio Precision APx555.
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Preamp
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Test Signal Path
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APx555 (Line Out) - Input 1 - Line Output - APx555 (Line In)
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Input Impedance
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Mic= 8.9 kOhms 48v Off, 5.4 kOhms 48v ON,
Line = 24.3 kOhms,
Hi-Z= 1.5 MOhm Unbalanced, 3 MOhm Balanced
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Max Input Level
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Mic = +17.6dBu (<0.003% THD),
Line = +26.5dBu (<0.02% THD),
Hi-Z = +24dBu (<0.02% THD)
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Minimum Gain
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Mic= 8dB, Line = 0dB, Hi-Z = 3dB
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Maximum Gain
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Mic = 68dB, Line = 60dB, Hi-Z = 63dB
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Equivalent Input Noise (EIN)
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<-129.5dBu (150 Ohm source, unweighted),
<-131dBu (150 Ohm source, A-weighted),
<-135.5dBu (Inputs common, unweighted)
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Frequency Response
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±0.7dB (<1 Hz to >1000 kHz, Min Gain),
±0.7dB (<1 Hz to >1000 kHz, 35dB Gain),
±1dB (<1.5 Hz to 900 kHz, 63dB Gain),
±1dB (<5 Hz to >200 kHz, Max Gain)
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Phase Shift
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<2.75° (20Hz to 20kHz, 40dB Gain),
<4° (20Hz to 20kHz, 63dB Gain), <6° (20Hz to 20kHz, Max Gain)
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THD+N
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<0.00025% (1kHz, 35dB Gain, +24dBu out)
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Intermodulation Distortion
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<0.0006% (50Hz and 7kHz, 35dB gain, +20dBu out),
<0.0005% (50Hz and 7kHz, 35dB gain, +15dBu out)
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Hi-Pass Filter (HPF)
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80Hz, -3dB, 12dB/Oct
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CMRR
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>70dB, typ >85dB, 35dB gain, 10-20kHz, 100mV Common mode
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Slew Rate
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20V/uS, 35dB gain, +25dBu out
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48v LED Thresholds
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Off = 48v Off, voltage fully discharged
Amber = 48v voltage charging/discharging
Red = 48v fully charged
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Signal LED Meter Thresholds
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Blue = -20dBu
Green = -12dBu
Amber = +21dBu
Red = +24dBu
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Max Output Level
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Balanced XLR = +27.5dBu (<0.002% THD, 30dB Gain)
Impedance Balanced ¼” Jack = +21.5dBu (<0.002% THD, 30dB Gain)
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Output Impedance
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Balanced XLR = 150 Ohm
Impedance Balanced 1/4” Jack = 150Ohm Balanced, 75 Ohm Unbalanced
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Link Max Output Level
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Impedance Balanced 1/4” Jack = +21.8dBu (<0.006% THD)
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Link Output Impedance
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Impedance Balanced 1/4” Jack = 75 Ohm Unbalanced, 150 Ohm Balanced (Buffered Output)
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