HV-3D-8 8-Channel 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 dB 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 mil-spec gold switching
• 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 or MADI digital output expander PCB
• Analog output expander PCB (3x outputs per channel)

Specifications

Minimum Gain

8.5 dB

Maximum 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 EIN

Total 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 deviation

Common Mode Rejection Ratio (35 dB Gain, 10 Hz - 20 kHz bandwidth, 100 mV C.M.)

> 65 dB, Typ > 85 dB

Slew Rate (35 dB Gain, +27 dBu Out)

> 25 Volts per microsecond

Maximum Input Level (20 Hz - 40 kHz)

+23 dBu (no attenuator pads required)

Maximum Output Level (20 Hz - 40 kHz)

+32 dBu

Phantom Input Impedance (1 kHz)

6,750 ohms

Output Impedance

24.3 Ohms (x2)

DPA (B&K) Mic Powering

+130 V dc max, (non-phantom)

Phantom Powering

+48 V dc, +/- 4 V dc

Power Consumption

45 watts maximum

Power Requirements

100V to 240V, 50/60 Hz

Dimensions/Shipping Weight

19” W x 3.5” H x 12.5” D, 23 lbs.

DANTE

Physical Layer

Ethernet

Connectors

Dual RJ-45 (Primary / Secondary)

Cable Quality

CAT-5e or better

Transmission Speed

1Gbps

Supported Sample Rates

44.1kHz, 48kHz, 88.2kHz, 96kHz, 176.4kHz, 192kHz

Minimum Dante Latency

250 µS

Supported Modes

Redundant / Switched

AES67 Support

Planned (Dante embedded)

Certifications

FCC CFR 47 Part 15 Subpart B, Class A
ICES-03 Issue 6 (Canada)
ANSI C63.4-2014

EN 55032:2015, EN 55035:2017, EN 61000-3-2:2014,   EN 61000-3-3:2013

Compliance

RoHS 2011/65/EU (and delegated directive (EU) 2015/863)
WEEE 2012/19/EU + REACH