Rack Mixer article
Rack Mixer for Beginners: A Complete Guide
A rack mixer looks unfamiliar when you first open the app, but the signal chain underneath is the same as any mixing desk. This guide walks you through it from the beginning.
If you're new to live sound or installed audio and someone has recommended getting a rack mixer, this guide explains what you're looking at, what the key concepts mean and how to set one up for the first time without getting lost in the jargon.
What You're Working With
A rack mixer is a mixing desk that fits in a 19-inch equipment rack. Unlike a traditional mixing console that sits on a table or stand with all its faders and knobs directly in front of you, the unit is compact enough to be secured in a rack case, often away from the mix position. You control it using a tablet app or laptop rather than physical knobs on the unit itself.
If the unit you're working with has a touchscreen (like the Yamaha TF-Rack) you'll have some direct control, but the main interface for most modern rack mixers is a Wi-Fi or Ethernet-connected app.
Understanding the Signal Chain
Audio flows through the desk in a consistent path:
- Input — a microphone or direct input (DI) connects to an XLR or jack input on the desk
- Preamp — the gain stage that boosts the mic signal to a usable level. Set the gain so the signal is strong but not clipping (usually aim for peaks around −12 to −6 dBFS)
- EQ — equalisation adjusts the tone of the signal: cut frequencies that are problematic, boost where needed
- Dynamics — compression or gating to control the volume envelope of a signal
- Fader — the main level control for how loud that channel appears in the mix
- Aux sends — additional outputs that feed monitor speakers or effects processors
- Main output — the combined mix that goes to the front-of-house speakers
Setting Gain: The Most Important First Step
Getting gain right is the foundation of a clean mix. Too little gain and the signal is noisy; too much and it clips and distorts. Most rack mixers have a physical gain knob for each channel and a software gain control in the app. Set the physical gain first — speak or sing into the microphone at performance level and adjust until the channel meter peaks in the −12 to −6 dBFS range consistently.
Don't rely on pushing the fader to compensate for low gain — that raises the noise floor along with the signal.
Using Aux Sends for Monitors
Aux sends are how you create monitor mixes — independent mixes that go to the speakers or in-ear monitors on stage, separate from the front-of-house mix. Each aux send can be set to a different level for each channel, allowing each performer to have a personalised mix.
On a rack mixer, aux send management is typically done through the control app. Most apps have a dedicated monitor mixing view that shows each channel's level in a specific aux send — learn this view early, as it's one of the most frequently needed features.
Saving and Recalling Settings
One of the greatest advantages of a digital rack mixer over an analogue desk is scene recall — the ability to save all your settings (gains, EQ, fader positions, effects) and recall them instantly. Use this. After your first successful soundcheck, save the scene. After any significant change, save a new scene. Running an event with reliable, recalled settings is significantly less stressful than recreating them from scratch.
For a full explanation of what a rack mixer is capable of and what the different models offer, the rack mixer overview covers it in detail. When you're ready to buy, the buyer's guide walks through what to prioritise at each budget level.
Comments