HV-3D-4 Microphone Preamp

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Authentic Transparency for Unrestricted Creativity

• Unsurpassed ambience retrieval
• Transformerless design with matched hi-speed discrete transistor octet has +23 dBu input headroom: no attenuator “pads” needed
• Uncolored timbral accuracy at all dynamic levels
• Entirely balanced audio path with precision components maintains signal integrity: THD under 5 ppm (.0005%)
• Effortless, vividly realistic musical performance
• Laser-trimmed FET-based output stage has 32 dBu headroom: drives 1000 foot (300 m) cable runs with ease
• Standard 36-step gain controls (1.5 dB per step) are stereo matched to .08 dB
• Ultra-clean universal power supply
• Grayhill gold mil-spec switching
• Silver Teflon power wiring
• Welded 16 gauge steel rack chassis
• Lovingly hand-crafted in Northern California

Options

• Ribbon optimized DC coupled input - $100/channel
• Extra 10dB gain - no charge
• DPA 130V input  - $300/channel
• Dante, AES, or MADI digital inputs

Specifications Minimum Gain8.5 dBMaximum Gain (1.5 dB per step, 36 steps)60 dB (up to 70 dB on request)Frequency Response (+0 / -3 dB)sub 8 Hz to beyond 300 kHz (sub 3 Hz by request)Noise (60 dB Gain, 10 Hz - 30 kHz, Inputs common)-133 dB EINTotal Harmonic Distortion + Noise (35 dB Gain, 10 Hz - 20 kHz bandwidth, +27 dBu Out)< .001%, Typ. < .0005% (< 5 ppm)Intermodulation Distortion (50 Hz & 7 kHz) 35 dB Gain, +27 dBu Out< .0009%Phase Response (35 dB Gain, 50 Hz - 20 kHz bandwidth, +27 dBu Out)< 2 degrees deviationCommon Mode Rejection Ratio (35 dB Gain, 10 Hz - 20 kHz bandwidth, 100 mV C.M.)> 65 dB, Typ > 85 dBSlew Rate (35 dB Gain, +27 dBu Out)> 25 Volts per microsecondMaximum Input Level (20 Hz - 40 kHz)+23 dBu (no attenuator pads required)Maximum Output Level (20 Hz - 40 kHz)+32 dBuPhantom Input Impedance (1 kHz)6,750 ohmsOutput Impedance24.3 Ohms (x2)DPA (B&K) Mic Powering+130 V dc max, (non-phantom)Phantom Powering+48 V dc, +/- 4 V dcPower Consumption45 watts maximumPower Requirements100V to 240V, 50/60 HzDimensions/Shipping Weight19” W x 3.5” H x 12.5” D, 21 lbs.