The ZDT preamplifier series is based on all new 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, an incredible 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. Check one out for your studio or other applications that demand the highest quality electronics.

Features:

• Zero Distortion - less than one part per million
• Lowest Noise of any preamp on the market
• Full Differential (balanced) from XLR in to XLR out � no internal conversion to single-ended
• 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
• 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
• Separate XLR & 1/4" Phone (t-r-s) outputs, each with its own gain/level controls
• 1/4" Phone connector output will drive balanced or unbalanced inputs

Specifications

Frequency response Impulse response THD Enoise (Input) Translation to EIN* Input Impedance Slew rate DC offset Power Requirements Size Weight

2Hz to 100kHz +/- 0.1dB 1Hz to 200kHz +/- 0.5dB 1% settling time - 1.4 usv30 mV/Pa square wave rise time - 0.27 us XLR stepped output - under 1 ppm (0.0001 %) Variable output - .001 % 1.6nV/Hz1/2 typical spectral density @ 20 dB gain; .86nV/Hz1/2 @ 40 dB gain .6nV/Hz1/2 @ 60 dB gain -132dBV @ 20 dB gain -140dBV @ 40 dB gain -143 dBV @ 60 dB gain (20Hz to 20kHz A weighted) Typical current noise spectral desnity @ input 1.5pA/Hz1/2 100 kOhms (phantom off) 13 kOhms (phantom on) 22V/us servo balanced to +/- 1 mV typical 120 VAC (230V unit available) standard IEC connector (supplied) Internal 250mA 250V spare fuse included 1 rack space 1.75" X 19" X 10.375" (~11" overall) 14 lbs. shipping

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