Millennia HV-3D Quick Reference Guide - Manual

Millennia Media HV-3C and HV-3D 022808 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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