If you’re running VOLT’s Stereo Generator [SG] DSP|Core:
VOLT: SG is a powerful stand-alone stereo generator. It’s designed to be used in split processing
situations where the main FM audio processor is at the studio, and audio is sent to the transmit-
ter location via STL. VOLT: SG leverages DSP power, to give you SSBSC for additional multiplex
immunity and a more robust HD signal, and “One Louder” to give you the effect of 10% more
modulation without exceeding legal limits.
Because VOLT: SG is a special case, we recommend you read that DSP|Core’s specific Quick
Start Guide. There’s a copy packed with the hardware, and you can download the latest version
from our website.
Since VOLT: SG is designed to take a processed signal from your station’s audio processor,
accurate input calibration is critical. This can avoid composite clipping, and control overshoots
introduced by nonlinearities in your STL.
Please use the following calibration procedure (which also appears in the Quick Start Guide):
7. Using typical program material, temporarily turn up the main clipper drive on your audio
processor to provide “worst-case” level at the input of the VOLT SG.
8. If you’re feeding VOLT: SG via AES or Livewire, set your processor’s peak output level to
–12 dBFS. If you’re feeding VOLT: SG via analog, set your processor’s peak output level to
10 dBu. –12 dBFS.
9. Set VOLT’s In/Out > Input > Level for the input you’re using to 0.0 dB, as a starting
value. Feed typical program material, and fine-tune VOLT’s input level so the meters are
just flashing only the -12 LED. (If your processor or STL has some overshoot, it’s accept-
able to flash a slightly higher LED. But don’t allow more than a dB or so of overshoot.)
10. Ideally, any output de-emphasis of your audio processor should be defeated, so VOLT:
SG receives a pre-emphasized, 16 kHz band-limited signal. If this isn’t possible, navigate
Stereo Generator > Adjust SG and set Emph Std (50us or 75us), Pre-Emph (OFF
or ON) and Input LPF (OFF or ON) as appropriate for your broadcast chain.
VOLT:
SG versatility gives you lots of other options. See the chapters on Front Panel Control and Remote
Control for more details on this DSP|Core’s settings.
Next steps for DSP|Cores with audio processing:
1. Navigate to Processing > Preset, feed normal program material, and choose a preset for
your initial setup. You’ll be able to change the preset and/or fine-tune its settings later.
2. [FM or AM Only] Navigate to Processing / QuickTweak > Clip Drive and set the drive
for the best compromise between loudness and distortion. It should always be set as low
as possible for the loudness needed. You’ll be able to refine this and the other QuickTweak
adjustments later. Exit back to Main Menu.
CHAPTER 2
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VOLT IN A HURRY!
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