Mackie MainStream: One Box for Streaming Sound and Video

The Mackie MainStream is an all-in-one live streaming and video capture interface that folds an HDMI capture card, a broadcast-grade audio interface, and a USB-C hub into a single bus-powered desktop unit. It captures 1080p60 video, passes 4K60 straight through to your monitor, and gives you a tactile row of six programmable keys to fire samples and transitions on the fly. For the creator tired of juggling a capture dongle, a separate mixer, and a tangle of adapters, it is the moment your whole stream lives on one deck.

Capture in Full HD, Monitor in 4K

MainStream splits the video job in two so nothing gets compromised. Its HDMI input runs through a dedicated capture card that pulls a clean 1080p signal at 60 frames per second into your streaming software, while a separate HDMI passthrough sends the source out to your display at full 4K60 resolution. That means you game or present on a crisp Ultra HD monitor while your audience receives a smooth, standards-friendly Full HD feed, with no software scaler stealing frames from your gameplay.

Broadcast-Ready Audio Inputs

Sound is where most streams fall apart, so MainStream leads with a genuine XLR microphone input offering up to 60 dB of gain and switchable 48V phantom power for studio condenser mics. A dedicated chat headset input keeps your gaming party audio separate, and a smartphone input lets you patch a live phone call straight into the broadcast for interviews and call-ins. A headphone output and stereo line outputs feed your monitors, and the whole path runs at a clean 24-bit, 48 kHz resolution.

Programmable Keys and Hands-On Control

MainStream puts a physical layer over your show instead of burying every action in a menu. Six programmable control keys trigger transitions, samples, and audio stings that punch up the energy of a stream, while dedicated level controls let you ride your mic, chat, and media volumes by feel. Reacting in real time to your audience becomes muscle memory rather than a frantic hunt for the right hotkey.

Matrix Software and a USB-C Hub

The included Mackie Matrix software is a powerful routing tool and digital mixer that lets you send audio between up to four hardware devices and six virtual channels, so game audio, chat, music, and your microphone each land exactly where they belong in the mix. The built-in USB-C hub adds ports for your peripherals, and because MainStream draws all of its power over that single USB-C connection, one cable carries data and power alike for a genuinely clutter-free desk.

Who the MainStream Is For

Live streamers, gamers, video podcasters, and hybrid presenters who want professional audio and reliable video capture without a rack of gear reach for MainStream as the hub of the setup. If you are running a single-PC stream, capturing a console, or hosting call-in guests, its combination of HDMI capture, 4K passthrough, real XLR audio, and tactile control makes it the one interface that carries the whole broadcast.