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Apollo x4 Hardware Manual Introduction 9
Operational Overview
Audio Interface
First and foremost, Apollo x4 is a premium 12 x 18 Thunderbolt 3 audio interface with
world-class 24-bit/192 kHz audio conversion. Apollo x4 connects to the outputs and
inputs of other audio gear, and performs analog-to-digital (A/D) and digital-to-analog
(D/A) audio conversions on the gear’s signals. The digital audio signals are routed into
and out of the host computer via the high-speed PCIe protocol, which is carried on a
single Thunderbolt 3 cable.
Apollo x4 leverages Universal Audio’s expertise in DSP acceleration, UAD Powered
Plug-Ins, and analog hardware design by integrating the latest cutting edge technologies
in high-performance A/D-D/A conversion, DSP signal reconstruction, and connectivity.
Apollo x4 acts as an audio interface with integrated DSP effects for tracking and
monitoring, a fully integrated UAD-2 DSP accelerator for mixing and mastering, as well
as a complete monitoring controller.
About Realtime UAD Processing
Apollo x4 has the ability to run UAD Powered Plug-Ins in realtime. Apollo’s
groundbreaking DSP + FPGA technology enable UAD plug-ins to run with latencies in the
sub-2ms range, and multiple plug-ins can be stacked in series without additional latency.
Realtime UAD Processing facilitates the ultimate sonic experience while monitoring and/
or tracking.
Note: Apollo x4, as with other UAD-2 devices, can only load UAD Powered
Plug-Ins, which are specifically designed to run on UAD-2 DSP accelerators.
Native (host CPU-based) plug-ins cannot run on the UAD-2 DSP.
Console Software
The included Console companion software application runs on the host computer and is
used to control Apollo x4 mixing and input monitoring with Realtime UAD Processing,
access the audio interface I/O settings, and more. Console’s analog-style workflow is
designed to provide quick access to the most commonly needed features in a familiar,
easy-to-use mixer interface.
Realtime UAD Processing is a special function that is available only within Console.
All of Apollo x4’s analog and digital inputs can perform Realtime UAD Processing
simultaneously, and Console inputs with (or without) Realtime UAD Processing can be
routed into the DAW for recording.
Console controls Apollo x4’s digital mixer so you can monitor Apollo x4’s inputs (with
or without Realtime UAD Processing) without using any other audio software such as a
DAW.
Console is integral to unleashing the power of Apollo x4. For complete details about how
to use Console and Realtime UAD Processing, refer to the
Apollo Software Manual.
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