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Apollo Solo Manual Glossary 248
Transimpedance Preamplifier A transformerless solid-state preamplifier utilizing a
transistor configuration that employs current feedback for ultra-low distortion and the
highest possible quality of signal from input to output. The transimpedance design allows
audio from 4 Hz to 150 kHz to pass through without altering the phase relationships
between fundamental frequencies and overtones. Noise and distortion are kept to near-
theoretical minimums so critical signals may be generously amplified without degrading
the quality or character of the sound source.
TRS Acronym for Tip-Ring-Sleeve. A ¼” phone connector with three conductors, typically
used for balanced signal connections (e.g., I/O) or carrying two unbalanced signals (e.g.,
headphones).
TS Acronym for Tip-Sleeve. A ¼” phone connector with two conductors, typically
used for unbalanced signal connections. Note that TS, like TRS and XLR, denotes the
connector only and does not necessarily indicate the signal level of the connection. TS/
TRS/XLR cables are used for both low-level (e.g., microphones and instruments) and
line-level connections.
UAD Acronym for “Universal Audio Digital.” Used in reference to digital products created
by Universal Audio.
UAD-2 A line of DSP accelerator products developed and manufactured by Universal
Audio.
Unison Universal Audio’s exclusive preamp hardware/software integration technology that
enables UAD preamp plug-ins reconfigure the physical input impedance, gain staging
response, and other parameters of Apollo’s mic preamp hardware to match the emulated
preamp’s hardware design characteristics with bi-directional hardware and software
control.
Virtual I/O Apollo audio inputs and outputs that exist in software but not in hardware.
Virtual I/O is used to route digital audio channels between Console and other audio
applications.
Wet Refers to a signal that is processed, e.g., recording a wet signal. The antonym of a
“dry” signal.
Word Clock A dedicated clock signal based on the transmitting device’s sample rate or
the speed with which sample words are sent over a digital connection. (See “Clock”)
XLR A standard three-pin connector used by many audio devices, with pin 1 typically
connected to the shield of the cabling, thus providing ground. Pins 2 and 3 are used to
carry audio signal, normally in a balanced (out of phase) configuration.
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