Earthworks 521 ZDT 500-Series Mic Preamp

High quality microphone preamp for 500-series format delivering clean, uncoloured sound with virtually no distortion.


The Earthworks 521 ZDT is a high quality microphone preamp for 500-series format using on David Blackmer’s Zero Distortion Technology.
The Earthworks 521 ZDT 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.
Earthworks 521 ZDT Mic preamp Main Features:

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

Suitable for most ribbon, dynamic, or condenser microphones



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