Millennia HV-3C User manual

Millennia Media HV-3C and HV-3D
041722
page 1 of 2
Millennia
Quick Start Guide
HV-3 Series Preamp Front Panel
1. HIGH RESOLUTION GAIN CONTROL
Detented, 36-position gain control employing a superior
quality Grayhill mil-spec gold plated rotary switch.
Switch gain is approximately 1.5 dB per step and is
inter-channel matched to better than 0.08 dB at all
settings.
After a brief warm-up period, adjustment of this switch
is virtually silent. Two illuminating pushbutton switches
(Green and Amber) determine the gain "range" of the
rotary switch.
When the pushbutton switches are not depressed (non-
illuminated), the mic preamp gain provided is as printed
on the front panel (9.0 dB, 10.5 dB, 12.0 dB, etc..).
When the green pushbutton switch (only) is depressed
and illuminated, add 18 dB to the gain settings as
printed on the front panel.\When the green and amber
switches are both depressed and illuminated, add 36 dB
to the gain settings as printed on the front panel. For
example, with both pushbutton switches depressed and
the rotary switch at 12:00 o'clock position, the preamp
gain would be 54 dB (18 + 36).
2. PHANTOM POWER SELECT SWITCH ("+48V")
Illuminating pushbutton switch which provides phantom
power (+48VDC) to the microphone inserted into that
channel. When this switch is depressed (illuminated
red), phantom power is applied simultaneously through
dual 6.81k ohm resistors to pins 2 and 3 of the three-pin
female XLR input.
Use phantom power with condenser and other
microphones requiring traditional phantom supply.
CAUTION: Applying phantom power to
ribbon microphones could damage them. Do
not use phantom with ribbons, moving coil, and
other microphones which do not require
phantom power. Use care, as well, to not insert
or extract mic cables from the HV-3 series
preamp when phantom power is active.
3. HIGH VOLTAGE SELECT SWITCH ("+130V")
Optional Illuminating pushbutton switch which selects
the four pin XLR input (+130VDC) for DPA (B&K) high
voltage microphones type 4003, 4004, 4009, and 4012.
When this switch is depressed (illuminated amber), the
HV-3 series preamp receives mic-level audio from the
four pin XLR input. If you are using a B&K (DPA) high
voltage microphone with four pin XLR connectors,
depress this switch so that it illuminates. If a
conventional microphone is used, do not depress this
switch. The HV-3 series preamp will not combine ("mix")
both conventional and high voltage microphones on one
channel. NOTE: The HV-3 series preamp is designed to
provide uninterrupted DC power to B&K (DPA) high
voltage microphones, regardless where this switch is
set. Use care that high voltage microphone
cables are not inserted or extracted from the unit when
power is on.
4. SIGNAL INDICATORS "OL" & "SP" LEDs
The green "signal present" (SP) LED indicates that a
nominal signal is present at the microphone input. It is
set to illuminate in the neighborhood of -35 dBu.
The red "overload" (OL) LED has been set to illuminate
when the balanced output reaches a level of +25 dBu.
However, the HV-3 series preamp can produce
unclipped, undistorted levels over twice this voltage.
Hence, the overload LED is not an indication of preamp
clipping. Rather, it is a general reference showing a
nominal "system" peak level.
If clipping is occurring in your recording path, check all
devices connected after the HV-3 series preamp and
reduce system gains accordingly. In the event that B&K
(DPA) 4004 or 4012 microphones are used with
hazardous sound pressures (over 130 dB, SPL), an
attenuator may be required between microphone and
preamp.
5. POWER SWITCH "POWER and PILOT INDICATOR
LIGHT LED - Rocker switch for switching AC line power
on and off. When LED is illuminated, shows that the HV-
3 series preamp unit is powered up and active.
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Media & Music Systems

Millennia Media HV-3C and HV-3D
041722
page 2 of 2
HV-3C
HV-3D
Rear Panel
1.CONVENTIONAL MIC INPUTS "48V IN "
Conventional 3-pin female XLR input jacks for use
with all conventional balanced microphones, both
phantom and non-phantom powered. Provides +48V
Phantom powering. Standard input impedance is
approximately 6,200 ohms. Pin 1 is ground. Pin 2 is
positive polarity. Pin 3 is negative polarity.
2.OPTION MIC INPUTS Two input options are
available; a 130V input and a DC-coupled “ribbon”
input. The option inputs are installed in the center
row. The drawing shows eight 130V inputs installed.
a.) 130V Option
Four-pin female XLR connector for use only with DPA
(B&K) models 4003, 4004, 4009, and 4012
microphones. Pin 1 is ground. Pin 2 is not connected.
Pin 3 is +130 Volts DC power and pin 4 is
unbalanced audio signal. Connecting anything other
than the above listed DPA models to this connector
may result in serious damage to microphone, the
HV-3 series preamp, or both.
b.) DC Option
Three-pin female XLR connector optimized for
dynamic microphones (ribbon, etc.). The DC option
bypasses the entire phantom circuit and routes a
microphone directly to the bases of the ultra-
matched gain transistors.
3.LINE LEVEL OUTPUTS "OUT"
Conventional three pin male XLR connectors
providing balanced, line level microphone output. Pin
1 is ground. Pin 2 is positive polarity. Pin 3 is
negative polarity. The line level output is designed
for driving 600 ohm loads and long, high capacitance
cables. Outputs may be configured in an unbalanced
configuration by either grounding one of the audio
polarities (pin 2 or pin 3), or taking one audio
polarity directly as an unbalanced signal
(recommended). In the former configuration, the
output is automatically decreased by 6 dB.
4.AC VOLTAGE MAINS SELECTION Note that
since 2017, HV-3C and HV-3D preamplifiers have
shipped with switch-mode power supplies. These
SMPS's detect mains voltages (90VAC to 243VAC)
and adapt automatically.
5.FUSES
5 x 20 mm,1000 mA, slow blow, 250 V, Littelfuse
218 or equivalent
POWER ENTRY "IEC Power Receptacle"
An IEC-type AC line-power receptacle for use with
removable cords. Use only the power cord
provided with the HV-3 series preamp unit or
equivalent U/L approved type SV, SVT, SJ, or SJT AC
power supply cord. Do not defeat the third pin earth
ground.
The complete HV-3D and HV-3C manuals are
available on-line:
HV-3C and HV-3D Full Manual
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48V
IN
130V
IN
OUT
This device complies with Part 15 of the FCC rules. Operation is subject to the following two conditions:
(1) This device may not cause harmful interference, and (2) this device must accept any interference
received, including interference that may cause undesired operation.
For 115 - 240VAC operation, 50-60 Hz. Use only the following fuse types shown:
100 - 120VAC: 2 ch x mA, 4 ch x mA, 8 ch xA, all 250V Litelfuse type 313 slow blow, or equivalent.
200 - 240VAC: 2 ch x mA, 4 ch x mA, 8 ch xxx mA, all 250V Litelfuse type 313 slow blow, or equivalent
Chassis/Audio
Ground Strap
100 / 115 / 230 Selection
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