Microphone Preamplifier System

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USER GUIDE


SYSTEM SPECIFICATIONS
The following are typical and apply for 70dB gain, 20Hz 20kHz, RS = 150 ohms, RL = 100k ohms, and TA = 25C unless otherwise noted.

Preamplifier
Channels balanced, symmetrical
     Model 4 1
     Model 5 2
Input
     Impedance, differential-mode 2M ohms
          Phantom 13.6k ohms
          Low Input Z 1k ohms
          Common-mode 1M ohms
     Maximum level See Dynamic range graph
     Equivalent input noise See Dynamic range graph
     Common-mode rejection ratio >110dB
Bandwidth      2Hz 300kHz
Frequency response 0.01dB
Gain range 10 - 70dB
     Control resolution, Model 4 5dB
     Accuracy 0.1dB
     Tracking 0.1dB
Crosstalk, Model 5 (200kHz)      <-140dB
Peak indicator level, Model 4 +24dBu
     Hold time 100ms
Output  
     Impedance, common-mode 6 ohms
     Maximum level (RL = 600 ohms) +30dBm
     Offset 0.1mVdc
Phantom supply      +48Vdc, 14mA/ch
Power supply  
     Voltage options (50 60Hz) 100, 120, 240Vac
          Operating range 15%
      Power consumption
          Model 4          16VA
          Model 5 25VA
     Leakage current (120Vac, 60Hz) 20uA
Dimensions 1U, 19in rack mount
     Model 4 10in (254mm) D FMS
     Model 5 14in (356mm) D FMS
Weight  
     Model 4 7.6lb (3.4kg)
     Model 5 11lb (5.0kg)

Gain control
Channels  
     GC32 2
     GC34 4
Control range 10 - 70dB
     Resolution 5dB
Peak indicator level +24dBu
     Hold time 100ms
Dimensions 1U, 19in rack mount,
3in (75mm)D FMS
Weight  
     GC32 1.8lb (0.8kg)
     GC34 2.2lb (1.0kg) 

Dynamic range vs gain

 

Dynamic range is the difference (in dB) between the maximum input level "ceiling" and the equivalent input noise "floor".

The maximum input level is limited only by the maximum output level of +31dBm at or less than 0.1%THD, as the output stage clips before the input stage at all gain settings.


 
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