Connectors are RJ-45 female, EMI-suppressed and wired according to the StudioHub+
®
stan-
dard. AES/EBU program input and output appear on pins 1+2 of the corresponding RJ-45, with
pin 4 as ground. StudioHub+ adapters are included with VOLT
11
: use the XLR connectors with a
green color sleeve.
If you want to apply an external sync signal for AES/EBU, use pins 3+6 of the input RJ-45; this
is the XLR female with a red color sleeve on our adapter. Sync source should be an AES/EBU
stream (often called “digital black”); VOLT does not sync to an unbalanced 75Ω word clock.
Livewire
Connect a Livewire Audio-over-IP network to the Livewire/LAN RJ-45 jack. Livewire must be
configured from a connected computer; see the chapter on Remote Control.
Don’t Know Jack?
StudioHub+ inputs and outputs, and Livewire or Ethernet LAN, all use identical RJ-45 connectors. You
can’t tell which is which by feel. Before connecting, look at the back-panel silk screening or the photo
in this chapter to make sure you’ve got the right one.
Check the Polarity!
It’s commonly agreed that when sound is converted to electricity, increasing air pressure is
represented by more positive voltages, and rarefaction by more negative ones. Unfortunately,
wiring or equipment problems can scramble this relationship. Errors in audio polarity — some-
times called “phase” — can hurt your processing.
If both channels of a stereo input don’t have the same polarity, Space-Efx won’t function and
VOLT:FM’s or VOLT:SG’s stereo generator can’t create an effective sub-carrier. If you’re doing
digital broadcasting or streaming, polarity errors can force the codec to waste bits where they’re
not important, and cause extra distortion for the listener. In mono AM broadcasting, a single
polarity flip can make asymmetrical processing waste power and drive the transmitter into
illegal over-modulation.
Even if you’re just using VOLT to feed recorders and headphones in your station, a polarity error
on either or both channels can generate complaints from the talent. That’s because their phones
won’t match the bone conduction they’re used to hearing when they talk.
VOLT lets you correct polarity errors, both on audio inputs and outputs. We also built this
correction ability into digital I/O, even though polarity errors are almost impossible with AES/
EBU or Livewire transmission. That way, you can use VOLT to correct errors that occur in
analog parts of your program stream.
Polarity adjustments are available both at VOLT’s front panel and on its web Remote Control.
See the appropriate chapter.
11 Get additional adapters from your local dealer or http://www.radiosystems.com. Some stations prefer to run
AES/EBU over Cat-5 or Cat-6 cables with RJ-45; full connection details are at http://www.studiohub.com.
CHAPTER 3
| 14
INSTALLATION AND REAR PANEL
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