Millennia HV-3D Four or Eight Channel Microphone Preamplifier - Manual (Page 3)

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HV-3D
QUICK START!
READ THIS!! The HV-3D operates with lethal operating voltages —
the voltage inside the HV-3D can kill you. Never, under any circumstances,
remove the top cover. Refer to a qualified electronics technician any and all
servicing and other operations which require the top cover to be removed.
Congratulations on your purchase of the Millennia Media HV-3D High Voltage Microphone
Preamplifier. The HV-3D is the result of meticulous listening tests on numerous circuit, topology,
and packaging designs. Your HV-3D is a finely tuned instrument intended for critical professional
applications — we feel it offers the world's most sonically neutral microphone preamplification.
With the emergence of 24+ bit digital audio, recording engineers are faced with a new require-
ment for undistorted dynamic range. The HV-3D meets this challenge exceptionally well.
Before connecting power to the HV-3D, assure that the rear panel voltage selection fuse block
switch is set correctly. In the USA, the HV-3D is shipped with the voltage selection block set to
100-120 VAC. If you change the voltage selection block to 200-240 VAC usage, be sure to
change both fuses to the correct types. See "Rear Panel" instructions for proper fuse requirements.
The HV-3D enclosure measures 19" wide x 3.5" high x 12.5" deep and is designed for mount-
ing into a standard 2U, 19" equipment rack. If the HV-3D is mounted in a road case or other
rack which is prone to strong vibration or shock, it is recommended that the rear of the HV-
3D be supported or otherwise reinforced to withstand such conditions. The HV-3D runs cool
but should be mounted with at least one rack space open above and below the unit.
The HV-3D is designed on a common ground topology. For high quality operation, and for your
own safety and the safety of others, do not defeat the purpose of the earth grounding pin on the
A/C power cord.
HV-3D FRONT-END PROTECTION
Back-to-back Zener diodes protect the super-matched bipolar input transistors against high tran-
sient energy spikes common when inserting and extracting XLR connectors. However, to maintain
top performance and protect the HV-3D's sensitive front-end, it is advised that you do not insert or
extract XLR connectors with preamp AC power on. Get in the habit of turning preamp power off
when inserting or removing microphone input or line output cables.
Millennia Media has long enjoyed a reputation for what many engineers call the world's most
musically accurate and dynamically stable microphone preamplifier. With B&K (DPA) high voltage
mic input option, a fully balanced audio path, enormous non-padded input and output headroom,
superior technical specifications, world-class internal componentry, optional A/D conversion, and
unparalleled sonic performance, the HV-3 series of microphone preamps is already becoming a
true classic in the professional audio industry — and will remain contemporary well into the next
century. Hence, Millennia Media.