3
Installation and Rear Panel
Physical Installation
Studio or Transmitter?
Obviously, if you’re using VOLT’s internal stereo generator with composite output, it should be
close to the transmitter(s)
2
. All operating functions can be controlled easily over a network, so
you’ve got complete flexibility to tune a transmitter’s VOLT from the studio.
But if you’re planning to locate VOLT at the station and feed Left / Right audio (with no sub-
carrier) to a transmitter via STL,
make sure the STL is linear, and does not use data reduction
or compression.
This may be non-intuitive: after all, today’s best compressed STLs can sound
pretty good. The problem is that lossy compression algorithms are designed for normal, unpro-
cessed speech and music in normal listening situations. VOLT optimizes your signal for trans-
mission, and the clipper is designed to create maximum loudness with minimum distortion
when broadcast. This can create waveforms that sound great on the air… but break the lossy
compression schemes in some STLs. The result that the STL will create extra distortion and lack
of clarity, before the signal even gets to the transmitter.
This warning also applies to HD and DRM transmission using VOLT’s Multicast DSP|Core. Our
exclusive Sensus processing can actually eliminate some of the distortions of those compressed
media. But “double compression”—first, through a lossy STL, and then through a compressed
digital media transmitter—can create unpredictable interactions that even Sensus can’t fix.
Increasingly, facilities with high bandwidth fiber links between their studios and transmitter sites
are discovering that Livewire AoIP can be used for high reliability, lossless STL. It lets you feed
a VOLT at the transmitter using Livewire Xnode at the studio, or use VOLT at the studio to send
processed AoIP audio to the transmitter. The Livewire capability built into every VOLT lets you take
advantage of today’s faster and cheaper IP bandwidth, with ever-increasing STL options.
2 VOLT has two separately adjustable composite outputs, so you can drive a main transmitter and backup
simultaneously.
8
Summary of Contents for Volt
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