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Earthworks er kjent for sine ekstremt transparente og nøytrale mikrofoner. Selvsagt måtte de også lage en forforsterker som passer til disse supernøytrale mikrofonene. 4 kanaler med ekstremt luftig og ufarget lyd er hva dette handler om. Et relativt beskjedent avvik på 0,5dB i 200 000Hz omfang sier litt. Fordelen med en slik ufarget forforsterker er at mikrofonens egenkarakter trer mer tydelig frem, og man kan tilpasse ønsket farging mer nøyaktig. Alternativt ha en totalt transparent signalvei, slik at alle nyansene i instrumentet eller stemmen får fritt spillerom.
Earthworks ZDT 1024 finnes også i en en 2 kanals utgave, samt en en-kanals løsning i halvrack-formatet. Er du en sann purist, skal du sjekke ut Earthworks ZDT 1024 nærmere. Utrolig bra, er den!!!
The primary gain path (XLR input-stepped gain-XLR output) is entirely differential
(this preamp is balanced all the way through, from input to output).
Precision stepped gain switch from 5 to 60 dB in 5 dB steps.
48-volt phantom power switch with LED indicator on each channel.
Variable gain control allows 20dB of gain reduction from stepped switch setting to a separate output amplifier and connector.
Standby switch mutes the output while the microphone remains powered.
Clip indicator LED shows imminent overload condition (10% below clipping) as well as actual clipping.
Polarity reversal switch on each channel.
Power on LED indicator.
Frequency response - 2 Hz to 100kHz within +0.1 dB, 1 Hz to 200kHz within 0.5dB (50ohm source)
Impulse Response - 1% settling time - 1.4 s; square wave rise time - 0.27s
Distortion (all types) - XLR stepped output- less than 1 ppm (0.0001 %) Variable output- 0.001 %
Enoise (input) - 1.6nV/Hz 1/2 typical spectral density @ 20dB gain; .86nV/Hz 1/2 @ 40dB gain; .6nV/Hz 1/2 @ 60dB
Translation of Enoise to EIN - -132dBV@20dB gain, -l40dBV@40dB gain, -143dBV @60dB gain.
(20Hz to 20kHz, A weighted) Typical current noise spectral density @ input 1.5pA/Hz 1/2
Slew rate - 22V/s
DC offset - servo balanced to 1 mV typical
Power Requirement - 120V AC (100V, 240V available), standard IEC connector (supplied), internal 250mA 250V spare fuse included
Input - XLR balanced transformerless input (pin 2 +) one per channel
Input Impedance - 10K ohm with phantom power on, 100K ohm with phantom power off
Outputs - XLR (differential, Pin2+) per channel from stepped gain control, 1/4 inch TRS (tip+, ring ref.)
from variable gain control, balanced, single ended
Dimensions - 1024, 1022 1 rack space 1.75" x 19" x 10.375" (1021 is 1/2 rack space)
Weight - 1024 (shipping: 4.5 kg), 1022 (shipping 3kg)
