HV-3C STEREO MICROPHONE PREAMPLIFIERS
Combining a precisely matched octet of discrete bipolar transistors with a laser trimmed DC coupled FET-based output driver stage, the HV-3C (tm) is an entirely "double balanced," extremely wide dynamic range stereo microphone preamplifier intended for demanding acoustic recording. Unlike "textbook" mic preamplifiers, the HV-3C signal path never unbalances or rebalances the original signal — thus maintaining a high degree of signal integrity. Over 20,000 channels of HV-3 micamps are already in use by a who's-who in critical acoustic recording
HV-3C signal path from input through output is entirely balanced with a minimum amplifier topology. Uncompromising circuit design with meticulous selection and hand-matching of critical components assures consistently transparent audio performance at all dynamic excursions and frequency extensions.
- Unsurpassed ambience retrieval
- Transformerless design with matched hi-speed discrete transistor octet has 23 dB input headroom: no attenuator “pads” needed
- Uncolored timbral accuracy at all dynamic level
- 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 toroid power supply
- Gold audio connectors and switches
- Mogami Neglex OFC audio wiring
- Silver Teflon power wiring
- Welded 16 gauge steel rack chassis
- 24-bit 192 kHz A/D “POW-R” converters (TBA)
- DPA (B&K) +130 V mic inputs
- DC inputs for ideal performance with dynamic and ribbon microphones
| Specifications | |
| Minimum Gain | 8.5 dB |
| Maximum Gain (1.5 dB per step, 36 steps) | 65 dB (up to 75 dB on request) |
| Frequency Response +0 / -3 dB | sub 3 Hz to beyond 300 kHz |
| 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 bandwdth, +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) |
| B&K (DPA) Mic Powering | +130 VDC, max, (non-phantom) |
| Phantom Powering | +48 VDC, +/- 2 VDC |
| Power Consumption, Maximum | 12 Watts Maximum |
| Power Requirements | selectable 100-120, 200- 240 VAC, 50/60 Hz |
| Dimensions/Shipping Weight | 19" W x 1.75" H x 12" D, 15 lbs. |
