8
Each Surface control panel connects to a host board, within the meter
bridge, using a single plug-in ribbon cable. This allows for rapid field
replacement, with minimal interruption to operations, in case of spills or
other damage to the EMX Surface controls.
Since the program audio resides within the Mix Engine, rather than
going through the Surface, any control panel can be swapped out while the
console is actively being used with minimal or no interruption to program
audio. Chapter 5 (EMX Service Information) covers how to replace and/or
obtain service on the control panels and other EMX console parts.
Meter Bridge
The integrated direct-view low-profile EMX Meter Bridge (Figure 1-5) sits
above and behind the control panels. It has four horizontal stereo level
meters with overload indicators, plus stereo cue speakers, a four-digit
timer display, and a hot-mic On-Air indicator.
Figure 1-5 EMX Meter Bridge
The level meters display from left-to-right: Program 1; Program 2;
Program 3; and a switched signal which can display Program 4 and three
user-set external signals: EXT 1; EXT 2; TEL; and a wild on-the-fly signal
set using the switched meter selector on the Monitor Control panel. The
switched meter can also be set to show cue levels while cue is active.
All four meters normally display both average and peak levels, but can
be set to show average-only or peak-only levels for special purposes.
The four-digit count-up timer is controlled manually, using the Monitor
Control panel Timer Start/Stop, Hold, and Reset buttons, or automatically,
when the Auto button is lit and a channel is turned whose audio source has
Timer Restart assigned (which is assigned using the EMX Surface Setup
app supplied with the console).
PR&E Mix Engine
All audio and logic connections are made on the rear of the Mix Engine
(Figure 1-6). This 1RU device has a built-in 5-Port Gigabit switch; two
high-quality low-noise Mic Preamps (with gain control and 48-volt
phantom powering); Signal Processing with EQ and dynamics (applied
on a fader channel basis); eight routable audio inputs (four analog and
four AES); four stereo audio outputs (four analog and four AES
outputting the same set of signals); four stereo analog monitor
outputs (to feed powered Control Room and Studio monitors, powered
cue speakers, and an outboard board operator headphone amp); six LIO
logic contacts (each independently set to function as a logic input or logic
output); and an Ethernet jack to connect the Engine to the built-in
Gigabit switch or to an AoIP network switch.
Figure 1-6 PR&E Mix Engine rear panel, Connection Detail
Input and Output Connectors
All audio, logic, and network connections on the Engine and on the
optional Razor I/O Interface (Figure 1-7)—other than microphone preamp
inputs which have female XLR connectors, use RJ45 connectors and
category wiring (CAT5, CAT5e, or CAT6).
Analog and AES wiring conforms to the St convention with two
balanced analog, or one AES/EBU (AES3) signal, per RJ45 jack.
The RJ45 Logic jack, which has six GPIO logic ports along with a +5V
and a GND connection, uses the WheatNet-IP (WNIP) logic jack wiring
format.
Figure 2-4 on page 12 has wiring pin outs for the RJ45 connectors used
to connect analog audio, digital audio, and logic to/from the EMX console.
Figure 1-7 Razor 16AD Interface, rear panel RJ45 Connector Detail
EMX SPECIFICATIONS
Test Conditions:
FSD = Full Scale Digital, 0 dB FSD equivalent to +24 dBu analog
0 dBu corresponds to 0.775 volts RMS—regardless of the circuit
impedance, as measured using a 600 ohm circuit.
Noise specs measured using a 22 Hz – 20 kHz bandwidth. A 30k Hz
bandwidth increases the noise measurement by 1.7 dB.
Mic Preamp
Source Impedance: 150 – 600 Ω, balanced
Nominal Input Level: -50 dBu
Input Range: -70 to -31 dBu (using trim control to reach nominal level)
Equivalent Input Noise: -131 dBu
Summary of Contents for EMX
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