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HomepageMic Preamps500 Series Preamps › Earthworks 521
Earthworks 521

The 521 ZDT brings the exacting standards of the Zero Distortion Technology preamplifiers to the convenient 500 series format.

The ZDT preamplifier series is based on discrete circuitry designed by David Blackmer, establishing a new standard of sonic excellence in electronics. This exacting new standard provides frequency response from 1Hz to 200kHz +0.5dB, a rise time of 0.27 microseconds and distortion of less than 1 part per million (0.0001%), eliminating all possibility of sonic degradation. These preamps are so fast, so clean and so transparent that you don't even know they are there. It is like plugging your microphone into a "piece of wire with gain". You will hear clarity and detail with the ZDT preamps that is not available in any other preamp at any price.
  • Zero Distortion - less than one part per million
  • High output level +33dBu
  • Very Low Output Impedance will drive long lines without interference or signal loss
  • True 48 volt phantom, polarity reverse & clip indicator
  • Lowest Noise of any preamp on the market
  • All Discrete Components; Class A Amplification (No ICs in the signal path)
  • No Electrolytic Capacitors in the signal path
  • Greater Transparency with minimum signal path and minimum features
  • Specifications
  • Preamp Type: Solid State
  • Number of Channels: 1
  • Frequency Response: 2Hz to 100kHz ±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: 10K phantom on, 100K phantom off
  • Front Panel Balanced Out: ¼" TRS XLR Fem. balanced transformerless (variable)
  • Dimensions: 1 500 series rack space 1.5" x 5.25" x 6"
  • Weight: 0.8 lb. (0.36kg)
  • Reviews
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    Free shipping in Canada. Conditions
    Additional information
    For more information about the 521, please visit the website of Earthworks
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