Apollo x4 Heritage Edition has all the benefits of the acclaimed Apollo x4, including elite-class A/D and D/A conversion, QUAD Core realtime UAD plug-in processing, Unison-enabled mic preamps, and full LUNA Recording System integration. And it goes a step further, with a software suite of 10 award-winning UAD plug-in titles, featuring Collections from Helios, Fairchild, Teletronix, Pultec, and UA. A hallmark feature of Apollo is its Realtime UAD Processing, letting you run the full library of UAD plug-ins at near-zero latency. Taking you a step further, Apollo x4 Heritage Edition gives you 10 premium plug-in titles worth over $2,400 — including the full suite of UA's Teletronix, 1176, and Fairchild compressors, Helios Type 69, V76, and UA 610 Unison mic preamps, all Pultec EQs, Oxide Tape Recorder, and Pure Plate Reverb. These premium Heritage Edition titles are in addition to Apollo Twin x4's included "Realtime Analog Classics Plus" bundle, giving you the most accurate library of classic analog emulations included with any professional audio interface. Apollo x4 Heritage Edition features four Unison-enabled mic preamps, letting you track through exacting mic preamp emulations from Neve, API, Manley, SSL, Avalon, Helios, and Universal Audio.* A Universal Audio exclusive, Unison is a proprietary hardware-software integration that nails the tone of these sought-after tube and solid-state mic pres — including their input impedance, gain stage “sweet spots,” and component-level circuit behaviors. Unison technology is also found on Apollo x4's dual front-panel Hi-Z instrument inputs, providing dead-on impedance and gain matching for guitar and bass amp models from Fender, Marshall, Ampeg, and more.

• A special edition of UA's acclaimed Apollo x4 interface — with a premium suite of 10 award-winning plug-in titles from Helios, Fairchild, Teletronix, Pultec, UA, and more — a $2,400 value
• Elite-class A/D and D/A conversion derived from the Apollo X rackmount interfaces
• 4 Unison mic preamps offer stunning models of classic tube and transformer-based mic preamps and guitar amps
• UAD QUAD Core Processing for tracking through vintage compressors, EQs, tape machines, mic preamps, and guitar amp plug-ins with near-zero latency
• Produce with LUNA Recording System — a fully-integrated recording application made for Apollo (Mac only)
• Runs UAD Powered Plug-Ins via VST, AU, and AAX 64 in all major DAWs
• Compatible with Logic Pro, Pro Tools, Cubase, Ableton Live, and more
• Dual front-panel Unison-enabled Hi-Z instrument inputs and headphone outs
• Built-in Talkback mic for communication with studio talent and recording slate cues
• Dedicated monitor functionality including monitor remote functions and Mono, Mute, DIM, and ALT monitor controls
• Up to 8 channels of additional digital input via optical ADAT/SPDIF
• Also includes “Realtime Analog Classics Plus” UAD plug-in bundle featuring UA 610-B Tube Preamp, Legacy Pultec EQ, additional LA-2A and 1176 compressors, Marshall Plexi Classic, Ampeg SVT-VR Classic, and more
• Uncompromising analog design, superior components, and premium build quality
• Free, industry-leading technical support — on the phone and online — from knowledgeable audio engineers