SKU: EW/-ZDT521 Categories: , , ,
Brands: Earthworks


The EARTHWORKS 521 ZDT 500-SERIES MIC PREAMP is a high quality microphone preamp for 500-series format using on David Blackmer’s Zero Distortion Technology.

The EARTHWORKS 521 ZDT 500-SERIES MIC PREAMP delivers the same sonic performance as its 1U rack counterpart, with high precision and pristine preamplification. The 500-series mic preamp features a switchable phantom power, polarity invert, and peak amplitude peak detection, a similar feature found on the rack version of the ZDT Preamp series. Transparent gain is provided up to 60dB in 5dB increments.

The solid-state mic preamp features a superior common mode rejection and overload margin as well as an incredibly low noise floor. The 521 ZDT has an ultra-wide bandwidth from 1Hz all the way up to 200kHz +/-0.5dB and extremely low distortion; less than 0.0001%. This ensures an exceptional performance and transparency. With a wide range of impedances applied, the Earthworks is ideal with any microphone be it dynamic, ribbon or condenser.

The main features of the EARTHWORKS 521 ZDT 500-SERIES MIC PREAMP include:

  • Clean, uncolored 500 series preamplifier for standard 500 series racks (required; sold separately)
  • Zero distortion, less than 1 ppm (>0.0001%)
  • Solid state, transformerless
  • Switchable 48V phantom power
  • Polarity invert switch
  • Peak amplitude clip detection
  • Transparent gain switchable from 5 to 60 dB in 5 dB steps
  • High output level of +30 dBu
  • Fully differential (balanced) from input to output (i.e., no internal conversion to single-ended)
  • All discrete components; Class A amplification (no ICs and electrolytic capacitors in signal path)
  • Greater transparency with minimum signal path and features
  • Low noise floor
  • Wide bandwidth



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Additional information

Weight 0.1 kg


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