Earthworks 1021 Earthworks ZDT preamps are like wire with gain. Their frequency response is flat and wideband,+/- 0.1 dB from 2Hz to 100kHz. The 1dB down points are below .5 Hz and beyond 500 kHz. Across the 'audio band' the ZDT preamp is effectively perfect. The Earthworks 1021, a single-channel, zero-distortion technology preamp equals wire with gain! Flat and wideband: 2-100k Hz, ?0.1 dB. No distortion: under 1 ppm at 10V RMS out. No noise: EIN is -140 dBV @ 40 dB of gain. No whistles and bells, but no rattle and hum either. Controls include phantom on/off, polarity reverse and standby. Overload LED lights before clipping. Stepped/variable gain control feeds two separate outputs.
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