Mix Bus
Definition
The final stereo output bus where all mix elements are summed before leaving the DAW or console. Also called the “2-bus,” “stereo bus,” “master bus,” or “master fader.” The mix bus is typically the last point where mix processing (compression, EQ, saturation, limiting) is applied before printing or sending to mastering.
Context
The mix bus is one of the most discussed routing concepts in mixing-talk (800 categorized messages about bus processing). The community debates what processing belongs on the mix bus, in what order, and how much is appropriate.
Key community positions:
- Mix into the bus chain from the start — don’t add bus processing after the mix is finished
- Restraint is essential — 1-3 dB of compression, subtle EQ, gentle saturation. Nomograph Mastering: “people doing fucked up shit on the mix bus is how I feed my children”
- Front bus / background bus architecture (Matt Huber, bobby k) splits the mix into two sub-buses before they hit the final mix bus, allowing differentiated processing
In DAWs, the mix bus is typically the “Master” or “Stereo Out” channel. All submixes (Bus groups, aux sends) route to the mix bus.