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Earthworks 521 Single Channel 500 Series Microphone Preamp front
Earthworks 521 1-Channel 500 Series Microphone Preamp

Earthworks 521 1-Channel 500 Series Microphone Preamp

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SoundPro Item: 106577
MPN: 521-ZDT
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Based on the Earthworks ZDT Zero Distortion Preamplifiers™ technology designed by David Blackmer, the 521 Single Channel Microphone Preamp from Earthworks brings the exacting standards of the Earthworks Zero Distortion Technology preamplifiers to the convenient 500 series format.

The solid state 521 features switchable phantom power, polarity invert, and peak amplitude clip detection, just as in the original 1021 single channel ZDT Preamp. The transformerless output stage of 521 ZDT easily drive long cable runs without loss of quality, making it ideal for long cable runs. Transparent gain is switchable from 5dB to 60dB in 5dB steps.

The Earthworks microphone preamplifier topology provides outstanding common mode rejection, excellent overload margin and an incredibly low noise floor, combined with the ultra wide bandwidth of the ZDT Preamps and distortion of less than 1 part per million. This exceptional level of performance is maintained over an extensive range of impedances applied to the input making the 521 suitable for practically any microphone – ribbon, dynamic or condenser.

Earthworks 521 Features

  • Zero Distortion – less than one part per million
  • Solid-state, transformerless
  • Switchable 48V phantom power
  • Polarity invert switch
  • Peak amplitude clip detection
  • Transparent gain switchable from 5dB to 60dB in 5dB steps
  • Ultra-low noise floor
  • Ultra-wide bandwidth
  • Suitable for most ribbon, dynamic or condenser microphones
  • 521 Single Channel 500 Series Microphone Preamp1
  • Number of Channels 1
  • Frequency Response 2Hz to 100k.Hz ±0.1dB, 1Hz to 200kHz ±0.5dB
  • Impulse Response 1.4µs
  • Distortion XLR out: less than 1ppm (0.0001%); 1/4” out: 0.001%
  • Input Noise 1.6nVHz½ at 20dB gain; 0.6nV/Hz½ at 60dB gain
  • EIN -132dBV at 20dB gain; -143dBV at 60dB gain
  • Slew Rate 22V/µs
  • Output DC Offset ±1 mV typical, servo balanced
  • Input / Output Connector 500 Series EDAC Edge connector
  • XLR Input Impedance 10KΩ phantom on, 100KΩ phantom off
  • Front Panel Balanced Out ¼” TRS XLR Fem. balanced transformerless (variable)
  • Dimensions 1 500 series rack space 1.5x5.25x6”
  • Weight 0.8 lbs (0.36kg)

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