Power your professional recording setup with this used Universal Audio Apollo x4 Heritage Edition, a premium desktop 12x18 Thunderbolt 3 audio interface in great condition. Featuring four elite-class Unison-enabled mic preamps and top-tier AD/DA conversion, the Apollo x4 delivers pristine audio quality with near-zero latency. Built for Mac and Windows, it offers real-time UAD processing, letting you record through classic analog-modeled plugins with no delay. With dual headphone outputs, two Hi-Z instrument inputs, optical ADAT/SPDIF expansion, and built-in talkback mic, it's perfect for serious home studios or mobile recording rigs. Includes DSP with QUAD Core UAD-2 processing for running demanding plugins. This unit functions flawlessly and shows only minor signs of use �C a powerful, reliable tool for musicians, producers, and engineers ready to elevate their sound.