User manual

10
Front panel
Output Controls:
Front panel controls for OUT 1 are described: those for OUTS
2 to 4 are identical.
OUT 1 MIX A is a stereo control adjusting the level at which
Input A signal is fed to Output 1. The range is from -∞ to +6 dB.
The control is centre-detented at unity gain (0 dB).
OUT 1 MIX B has an identical function to [8] for Input B.
Pressing the latching MUTE button mutes Output 1
completely.
Red LED indicates Output Mute [10] is active.
The Left and Right channels of the Output may be summed
with the MONO button. As with the input mono function, a 6 dB
pad is inserted to maintain mono/stereo level compatibility.
Green LED indicates Output Mono [12] is active.
A set of meters is provided with characteristics identical to
those of the input meters [6]. The output metering point is post
both the Mix controls [8 & 9] and the Output Mute button [10].
A separate Peak LED indicates that the signal level is within
1 dB of clipping. The signal is monitored before the Mix controls
[8 & 9] as well as at the metering point.
Other front panel features:
A convenient set of scribble strips is provided for the user
to note the various zone locations. These can also accept
standard 6 mm or 9 mm width tape from Dymo ®, Brady ®,
Brother ®, etc. label printers.
The green Power LED illuminates when AC power is
applied to the unit. The dBZ-48’s power switch is on the unit’s
rear panel.
The dBZ-48 may be mounted in a standard 19” rack
housing. Please observe the guidance regarding ventilation.
Front and rear panel description
Front panel
Input Controls:
Front panel controls for IN A are described: those for IN B are
identical.
IN A LEVEL is a stereo control adjusting input stage gain,
with range from -∞ to +6 dB. The control is centre-detented at
unity gain (0 dB).
Pressing the latching MUTE button removes Input A’s signal
from all outputs.
Red LED indicates Input Mute [2] is active.
The Left and Right channels of the Input may be summed
with the MONO button. A 6 dB pad is inserted in mono mode to
maintain mono/stereo level compatibility.
Green LED indicates Input Mono [3] is active.
Three LEDs indicating signal level for each channel of the
stereo input: the green sig LED illuminates at -20 dBu; two
further yellow LEDs illuminate when the input level is +4 dBu
and +10 dBu respectively, with the LEVEL control set to zero.
The meters are post the input level control [1], and therefore
can be used when this is adjusted. However, they are pre the
mute button [2], and thus will continue to indicate the presence
of an input signal even when the mute is active. The meters
possess PPM-style ballistics (fast attack, slow decay).
A separate red Peak LED indicates that the signal level is
within 1 dB of clipping. The signal is monitored before the level
control [1] as well as at the metering point.
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