Crest Audio HP-EIGHT, Owner'S Manual

Page: 67 / 84

master section
8
p. 67
Master Section: Monitoring & Control
Talkback Section
The operator can use the built-in facilities of the HP-Eight to talk to the main, group
or aux buses in the console. Often times the operator will need to selectively com-
municate with a performer, or slate a performance during a recording.
TB Input
This front-panel XLR jack can accept mic-level signals and is equipped with a phantom
power option header (internally located behind the XLR jack within the Master mod-
ule).The default setting for the phantom power is ON.
NOTE: +18 volts phantom power is available for the TB mic. Most condenser mics
will operate at this voltage, but there are some microphones that need the full, +48
volts to properly function. Only use dynamic microphones, or condensers that can
operate properly on +18 volts for the TB mic.
TB Level
This pot controls the level of the TB signal to be sent to the selected buses.
TB Select Switches
The operator can choose which buses are fed by the Talkback audio using these 8
switches.The 3 main buses, all 8 groups, or the Aux buses (in pairs) can be selected.
TB ON with LED
This latching switch (and LED) feeds the Talkback audio to the selected buses.
Output Metering
10 dedicated LED meters show the output level of whatever signal is being controlled
by the corresponding 100mm fader. Normally the 8 Group outputs, along with the
L&R main buses are displayed across the 10 meters. If a Fader-Flip switch is depressed,
that corresponding Aux output (1 thru 10) is displayed instead.The displayed signal is
Post-fader and Post-Mute.The meters have a VU-type response, showing the average
levels of the signals being monitored. Use the Peak LEDs on each individual output to
check for any overload conditions for that signal.
Nominal output level of the HP-Eight console is +4dBu.This is indicated as 0 VU on
the meter scale, with additional LEDs indicating 3dB steps, both above and below this
0-reference point.
Power Supply Monitor
These 4 LEDs, located above the Solo meters, monitor the internal voltages of the
Console. Each green LED indicates the presence of its indicated voltage rail.These
LEDs will illuminate when the Console is powered EITHER from its internal supply
OR from an external supply. See Power Supply section for further details.
Lamp connectors
Two BNC lamp connectors are provided at the top of the Master Module for
Console illumination.These connectors will power either the low-intensity or high-
intensity versions of the popular, goose-neck 12-volt console lamps (available separate-
ly).The connectors are current-limited to protect against external shorting. Positive
voltage is on the center pin, the connector barrel is at 0-volts.
NOTE
: Since the reso-
lution of the LED
meters is 3dB, the nominal
+4dBu level of an output can’t
be determined closer than
that 3dB. The 0VU LED may
be on, but the output may not
be e4dBu. If a more
precise measurement is
needed, an external digital
meter, or analog VU meter
should be used.
+
NOTE
: The +18 and -
18 indicators are for
the main analog voltage rails,
these are used to power the
majority of the opamps within
the Console. The +12 indica-
tor shows the aux-power rail
used to power the LEDs and
other non-audio circuits of
the Console. The +48 LED
monitors the phantom volt-
age.
+
NOTE
: Any 12 volt
accessory can be powered
from these BNC connectors,
as long as it draws less than
500mA (total for both connec-
tors). You can try one of those
12 volt personal fans to keep
cool when mixing on a hot
day.
+