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6
H A - 6 A B / H A - 6 A B E M a n u a l
DESCRIPTION OF CONTROLS:
FRONT PANEL
INPUT LEVEL: The Input Level control provides a
means of scaling the effect of the individual head-
phone volume controls. The Input Level should
be adjusted so that there is an adequate range
of volumes available at each listening position,
so that any listener can be accommodated, and
the average listener’s volume will be set at about
halfway. The Input Level control is stereo; it affects
both left and right channels simultaneously.
SIGNAL PRESENT LIGHTS: These yellow LED’s
turn on whenever a signal exceeding 125 mil-
livolts RMS (40 dB below full power) is present
at the HA-6AB’s input jack. They will increase in
brightness as the signal strength increases. This
feature is very useful and can provide a clue to
where the fault may lie if the expected program
is not heard at the listening stations.
OVERLOAD LIGHTS: These LED’s glow red to
indicate an overload in the HA-6AB. If the LED
lights up, either the drive level to the unit should
be reduced, or the setting of the Input Level con-
trol should be reduced until the LED remains off.
The lights turn on when the signal level at either
output approaches .5 to 1 dB of clipping. Once
triggered, the lights will stay lit for a minimum of
50 milliseconds so they can be easily seen, even
if the actual duration of the overload is much
shorter.
HEADPHONE JACKS / VOLUME CONTROLS:
Any type of headphones, wired with a standard
1/4” stereo phone plug, may be used success-
fully. All six outputs receive the same stereo
signal. They differ only in the individual volume
settings.
SPEAKER-A BUTTON: Depressing this but-
ton turns on the speakers connected to the
SPEAKER-A banana jacks on the rear panel, and
simultaneously turns off the signal to all the front
panel headphone outputs.
SPEAKER-B BUTTON: Depressing this button
turns on whatever is plugged into the SPEAKER-
B SATELLITE/REMOTE XLR connector on the
rear panel. This will be either a pair of speakers
or a chain of HR-2 Remote Stations. Therefore,
leave this button depressed when using Remote
Stations. Depressing it does not turn off the front
panel headphone outputs. See the section on the
Rear Panel for speaker wiring.
POWER LIGHT: Glows red when unit is receiv-
ing power and the ON-OFF SWITCH is in the
ON position.