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Earthworks 521 ZDT
500 Series Single-Channel Microphone Preamp

OUR PART #:  521-ZDT

The 521 ZDT, based on the Earthworks ZDT Zero Distortion Preamplifiers™ technology designed by David Blackmer...
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Our Price: $999.00
List Price: $1,249.00
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Earthworks 521 ZDT
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The 521 ZDT, based on the Earthworks ZDT Zero Distortion Preamplifiers™ technology designed by David Blackmer, 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.

Features:

  • Clean, uncolored 500 series preamp
  • 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
  • Requires a 500 series rack

Specifications:

  • Preamp Type: Solid State
  • Number of Channels: 1
  • Frequency Response: 2 Hz to 100 kHz ±0.1 dB, 1 Hz to 200 kHz ±0.5 dB
  • 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: 10KOhm phantom on, 100KOhm phantom off
  • Front Panel Balanced Out: 1/4" TRS XLR Fem. balanced transformerless (variable)
  • Dimensions: 1 500 series rack space - 1.5" x 5.25" x 6"
  • Weight: 0.8 lb (0.36 kg)

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