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Wiring the unit
The use of twin-and-screen cable is recommended for both
inputs and outputs.
Inputs
Preferred wiring for both balanced and unbalanced sources is
illustrated below:
Balanced
Unbalanced
A 'ground lift' facility is available on the dBZ-48d's inputs, which
may be useful in resolving earth hum issues. Normally the input
XLR's pin 1 is connected to ground, but this connection may be
broken by moving an internal pcb jumper.
Overview
The Apex dBZ-48d can be used in any situation where one
or two stereo audio signals need to be routed and mixed at
different levels to up to four destinations.
See Block diagram on next page. Each of the two inputs is
provided with electronic balancing, RFI filtering, mono/stereo
switching, level control, a muting circuit and LED metering.
After A-to-D conversion, the inputs are routed through the DSP
section, where they are split to the four output channels.
Delay, filtering and polarity (phase) are implemented by DSP
on a per-output channel basis. After D-to-A conversion, the
level of each input signal fed to each output channel may be
12
groundlift jumpers on pcb
Outputs
Preferred wiring for both balanced and unbalanced destinations
is illustrated below:
Balanced
Unbalanced
individually set. Again, mono/stereo switching, muting and LED
metering are available for each output. The servo-balanced
output stage design results in a very low output impedance,
making it possible to drive long balanced lines (e.g., from a
FOH mix position to stage amp racks).
Note that the DSP processing (delay, filtering and polarity...)
precedes the mixing stage (where inputs A and B are combined),
and that the mixing is in the analogue domain. This architecture
allows rapid level/mix adjustments in "real-time", without any
delay between making the adjustment and hearing its effect.
Overview
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