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IEC mains connector
and power switch
Voltage selector
switch
Calibration port
(factory use
only)
Input connector
Input sensitivity
switch
Voltage selection and
fuse rating chart
Impact indicator
HD-1
High
Definition
Audio
Monitor
Cone low fre-
quency driver
Indicator LED
Dome tweeter
Setup & Operation
Power
• Set the voltage selector switch
before you connect and operate
the unit.
The HD-1 accepts AC voltages
from 90 to 260 VAC, at 50 or 60 Hz,
in four ranges. Select the range that
is closest to the local mains AC
voltage.
Do not switch among AC voltage
ranges with the power cable
connected to an outlet.
Fuse
The HD-1 is protected by a fast-
acting fuse in the voltage selector
switch.
• If the fuse blows, check the line
voltage and the voltage selector
setting.
• Always replace the fuse
with a component of
the same type and
rating.
Power Cable
• Connect the HD-1 to a
three-prong outlet.
If the power cable appears frayed
or broken, replace it immediately
before operating the unit.
Never use ground-lifting
adapters. Do not cut the
AC cable ground pin.
Placement
The HD-1 is designed for “near
field” operation. The best listening
distance is between 3 and 9 feet
from the speaker face.
The HD-1 is aligned for flat
frequency response in free field (no
adjacent boundary surfaces).
Placing it next to a wall or on the
floor will cause the low frequencies
to be exaggerated.
Nearby surfaces (such as a
mixing console control surface)
should be angled to minimize
reflections toward the listener.
For stereo playback systems,
speaker stands are highly recom-
mended. Place them at least 3 feet
from any wall. In recording studios
the speakers may be placed on the
meter bridge.
• Always allow at least 6 inches
clearance behind the speaker for
cooling airflow.
The HD-1 requires a grounded
outlet. Use a grounding adapter
when connecting to ungrounded
outlets.
When handling the
HD-1, avoid touching or
pressing on the dome
tweeter. If the dome
becomes dented, the
unit should be returned
for testing and
calibration
even if the
dome pops back into
position.
Locations of HD-1 Loudspeaker Components, Connectors and Controls
Earth ground
Chassis ground
Yellow/Green =
Earth Ground (Chassis)
AC cable color code for wiring
international or special-purpose
power connectors
Brown =
Hot
Blue =
Neutral