Universal Audio Apollo X4 Gen2 Analog Classics Pro
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Universal Audio
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From the Apollo Twin to the Apollo x4: Desktop Power Steps Up
A direct evolution of the iconic Apollo Twin, the Apollo x4 takes the desktop interface concept further with more inputs/outputs, two additional preamps, and enhanced monitoring features. Its latest-generation 24-bit / 192 kHz A/D and D/A conversion and Apollo Monitor Correction powered by Sonarworks technology provide ultra-reliable working listening, whether on speakers or headphones.Who Is It For and What Is It For?
Designed for demanding home studios as well as small professional setups, the Apollo x4 excels at multi-source recording (vocals, guitars, synths) and hybrid mixing. Its four preamps and two front-panel Hi-Z inputs simplify sessions with singers and instrumentalists, while ADAT allows quick expansion of input count for drums or live setups.Key Features to Work Faster and Better
Real-Time Unison
The four Unison preamps replicate the impedance, gain curve, and harmonic behavior of legendary preamps and console channels. Record through iconic plug-ins like Neve, Manley, or API to capture the desired analog character right at the source.Precision Conversion and Monitoring
Thanks to converters offering 127 dB of dynamic range, the Apollo x4 delivers remarkable detail. Apollo Monitor Correction (by Sonarworks) helps neutralize room flaws to achieve more confident mixing decisions and masters that translate everywhere.UAD-2 Quad DSP and Studio+ Bundle
The UAD-2 Quad processor handles UAD effects to free up the computer's CPU and ensure inspiring live monitoring. The Studio+ plug-in bundle includes essentials like the "Teletronix LA-2A" compressors, "Pultec" equalizers, and "Marshall" and "Ampeg" amp emulations to shape your recordings and mixes.Studio Ergonomics
The UAD Console software centralizes routing, plug-in scenes, and new monitoring tools (Auto-Gain, bass manager). Dedicated physical controls, built-in talkback mic, and dual headphone outputs facilitate collaborative work and guided recording sessions.Technical specifications
| Compatibility | PC, Mac | Max resolution | 24-bits |
| Sampling frequency | 192 kHz | Headphone outputs | Yes |
| Dynamic Range | 127 dB | Dimensions (W x H x D) | 233 x 151 x 66 mm |
| Includes | Studio+ plug-in bundle | Weight | 1.46 kg |
Questions frequently asked
Does the Apollo x4 Gen2 work on Mac and PC?
Compatibility is announced with both Mac and PC computers. The audio conversion can reach 24-bit / 192 kHz.
How many preamps and instrument inputs are available?
Four Unison preamps are built-in, with two Hi-Z inputs located on the front panel. This setup allows recording vocals, guitars, and synths within the same session.
Can the number of inputs be increased to record a drum kit?
Expansion via ADAT allows adding inputs for a drum or live setup.
Which plug-ins are included with the Apollo x4 Gen2 Analog Classics Pro?
The Studio+ bundle is included and notably contains Teletronix LA-2A compressors, Pultec equalizers, as well as Marshall and Ampeg amp emulations. The UAD-2 Quad DSP processes these effects to offload the computer's processor. Direct monitoring can thus incorporate UAD processing.
Is Sonarworks correction available on this interface?
The Apollo Monitor Correction feature, powered by Sonarworks, is designed to correct speaker or headphone monitoring. The converters feature a dynamic range of 127 dB.



