41
The EMX Surface meters have better resolution than the on-screen
meters so they should be used for the most accurate input level
adjustment. Connect a test tone, at +4 dBu, from a connected device then
adjust the input control so the top of the bar graph is at -20 dBFS on the
on-screen meters. Assign that signal to an EMX channel. Set the channel
fader to align with the -12 dB unity gain arrows. Turn the channel on and
assign it to a Program bus (with no other channels assigned to that bus).
The EMX Surface meter’s bar graph should light up all of the green LEDs
and one yellow LED, which is the -20 dBFS point on the EMX Surface
meters. If this is not the case, adjust the input level or balance control.
Balanced vs. Unbalanced Inputs & Outputs
One common use for the input level control is to boost the gain of
signals coming from an unbalanced device. Many “Prosumer” devices use
¼” connectors, but many are unbalanced TS (Tip-Sleeve) instead of
balanced TRS (Tip-Ring-Sleeve) jacks. Their nominal output level may also
be the same as on consumer unbalanced “RCA” jacks: 300 mV rather than
the 1.2 V nominal levels found on balanced output devices.
The unbalanced device’s hot signal is connected to the + input and, on a
TS connector, the – input will end up being connected to ground. This will
cause the input signal to be 6 dB lower than normal since it’s unbalanced,
but it often has a lower output level to begin with, so typically the level
control must be used to add from +12 dB to +18 dB of gain to
compensate for the lower level from the unbalanced device. Doing this
eliminates having to use a level match box on that unbalanced signal.
Note: A Blade’s balanced output cannot directly connect to an
unbalanced device—even though the output gain can be lowered to
an appropriate output level, because there is no ground reference
on the Blade’s RJ45 output jacks. Thus, you must use a balanced-
to-unbalanced match box or a balanced-to-unbalanced transformer
to connect any Blade’s analog output to an unbalanced device.
Assigning Logic
Every Blade has six LIO (Logic Inputs or Outputs) on each RJ45 Logic
jack on the Mix Engine, Razor I/O Interfaces, and M4IP-USB Blades. These
LIO connections are used to connect legacy devices using hardware GPIO
(General Purpose Input/Output) logic, like Henry Superelays, CD players,
hot mic arm LEDs, etc.
In addition to the six GPIO “pins” on each RJ45 Logic jack, every Blade
also has 128 “Software” or SLIO signals which are used to carry logic
between the EMX and networked WNIP-compatible devices like
Wheatstone talent panels, Eventide delay units, and automation
software from RCS, Wide Orbit, ENCO, and many other vendors.
LIO and SLIO logic is set using the same Edit Signal window as used to
set the audio format (stereo/mono) and to name the audio signals.
When the logic is associated with an audio input signal, like BLO1MIC1,
select that audio input name (it highlights) then click Edit to open the Edit
Signal window (the process shown in Figure 3-29 on page 40). Click the
LIO Info tab (Figure 3-31) to view, edit, or delete the logic settings
associated with that audio signal.
Figure 3-31 Logic Assignment tab
Figure 3-31 shows the typical settings used with a WNIP Talent Station
(TS). It uses two logic signals to carry Remote On and Remote Off
commands from the TS to the EMX channel, and two logic return signals to
carry the On and Off Tally logic back to the TS. These are assigned using
Software LIO since the TS is a networked device. Clicking Add opens the
Assign LIO window, also shown in Figure 3-31.
Note: WNIP 6-channel GPIO Relay Interfaces are available from
. Each connects to a Logic jack using a
standard straight-thru CAT5 cable. The interfaces have screw
terminals to connect peripheral device wiring.
Logic Only Signals
In the Blade > Sources or Blade > Destinations tab, click Add… to
open a new Add Signal window. To create a new logic-only signal, in the
Signal Type: section, select LIO only. A default name is assigned (like
BL01D01) but this name should be changed to something useful, like CR
Summary of Contents for EMX
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