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The Millennia HV-3D (tm) is a four or eight channel, fully matched
microphone preamplifier of uncompromising sonic character, technical
specification, and mechanical workmanship. The HV-3D offers multiple
channels of HV-3C preamplifiers at significantly less per-channel cost.
With circuitry identical to Millennia's acclaimed HV-3C series high
voltage microphone preamplifier, the HV-3D offers high resolution gain
switching (36 steps @ 1.5 dB per step), optional B&K (DPA) 130V mic
input option on every channel, DC-coupled input option on every channel
for optimizing ribbon and other dynamic mics, a passive summing option,
and future options, including remote gain control (late 2005).
Unlike preamps using vacuum tubes, IC function modules, and audio
transformers (all of which lend their own audio coloration),
Millennia's HV-3 micamp architecture is precisely optimized towards
capturing the subtlest detail of music and ambience. With +23 dBu
native input headroom, the HV-3D requires no input pads or switch
points as found on common "textbook" preamp designs - thus avoiding yet
another source of sonic degradation. Moreover, with its +32 dBu output
headroom, ultra-high dynamic stability and linearity is assured.
HV-3D signal path from input through output is entirely balanced
with a minimum amplifier topology. Uncompromising circuit design with
meticulous selection and matching of critical components assures
consistently transparent audio performance at all dynamic excursions
and frequency extensions. Moreover, standard audio cables over 1000
feet in length have been driven from HV-3 mic preamps with no
immediately detectable signal degradation.
Highlights
- High Speed Transformerless Design
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23 Db Input & 32 Db Output Headroom (No Pads Required)
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Entirely Balanced Audio Path
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Optional B&K (Dpa) +130 Volt Inputs On All Channels
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Optional Dc-Coupled "Ribbon Inputs" On All Channels
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Laser Trimmed Fet-Based Output
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Thd+N Less Typically Than 5 Ppm (.0005%)
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Matched Discrete Transistor Front-End
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High-Resolution Gain Switches Standard (36 Steps)
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Interchannel Gain Matched To .04 Db
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Four Ch. Unit Factory Upgradable To Eight Ch.
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Fully Shielded Internal Toroid Power Supply
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Unsurpassed Ambience Retrieval
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Effortless, Lifelike Musical Performance At All Dynamic Levels
Available Options
- B&K (DPA) +130V mic inputs
- DC Optimized Mic Inputs
- Channel Summing
Specifications
| MINIMUM GAIN |
8.5 dB |
| MAXIMUM GAIN (1.5 dB per step, 36 steps) |
60.5 dB (up to 78 dB on rqst) |
| FREQUENCY RESPONSE +0 / -3 dB |
sub 4 Hz to beyond 300 kHz |
| FREQUENCY RESPONSE, STEREO DEVIATION |
< .04 dB |
| NOISE @ 60 dB Gain, 10 Hz - 30 kHz, Inputs common |
-133 dB EIN |
| NOISE @ 60 dB Gain, 10 Hz - 30 kHz, 50 Ohm Source |
-130 dB EIN |
| NOISE @ 60 dB Gain, 10 Hz - 30 kHz, 150 Ohm Source |
-128 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 |
| PHASE RESPONSE, STEREO DEVIATION 35 dB Gain, 20 Hz - 40 kHz bandwidth,
+27 dBu Out |
< 1/2 degree 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* |
| MAXIMUM OUTPUT LEVEL 20 Hz - 40 kHz |
+32 dBu |
INTERCHANNEL CROSSTALK
35 dB Gain, 1 kHz, +27 dBu All Outputs |
Better than -120 dB (> 20 Bits) |
| PHANTOM INPUT IMPEDANCE @ 20 Hz |
6,700 Ohms |
| PHANTOM INPUT IMPEDANCE @ 20 kHz |
6,800 Ohms |
| OUTPUT IMPEDANCE |
24.3 ohms (x2) |
| B&K (DPA) MIC POWERING |
+130 VDC, max, direct (non-phantom) powered |
| PHANTOM POWERING |
+48 VDC, +/- 2 VDC |
| POWER CONSUMPTION, MAXIMUM |
45 Watts, Maximum |
| POWER REQUIREMENTS |
100 to 240 VAC, 50/60 Hz |
| DIMENSIONS |
19" W x 12" D x 3.5" H |
* Approximately equivalent to the output of a B&K 4012 microphone in a 145 dB SPL soundfield.
- Unless stated, all measurements are balanced into 100k ohm load on a calibrated Audio Precision System One.
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