Mix Preparation and File Delivery for Mastering
Sending your mix to a mastering engineer is not just about providing a file. It is about giving them the best possible starting point. A well-prepared mix allows mastering to focus on translation, dynamics, and tonal balance, rather than technical correction.
TL;DR
Love your mixes.
Prepare your mix so it’s something you truly love.
Leave some headroom and usable dynamic space.
Listen to rendered mixes critically.
Label files clearly and include metadata.
Communicate your creative goals.
Love your Mix
Listen on one device or speaker system that you are most familiar with. If you listen on two different systems you will get two different results. The adage goes, A person with one watch always knows what time it is; A person with two watches is never sure.
Before exporting for mastering, make sure you are genuinely proud of your mix. Trust the monitoring system you know best, whether that is your main monitoring rig or your primary headphones, and address any mix balance problems, timbral distractions, annoying sibilance, clicks, or obvious issues like excessive low end or stereo imbalance before you render. A weak mix rarely becomes an awesome master.
Mastering is not a mix rescue tool. It is the final creative refinement layer, where decisions are enhanced and translated, not fundamentally changed.
FILE TYPES, SAMPLE RATE, AND BIT RATE
WAV/AIFF exports are required.
32-bit floating point exports are preferred (24-bit is acceptable).
Do not apply dithering.
Export in native sample rate.
Headroom
I have no rigid requirement for a specific headroom number, but the mix should leave usable dynamic space below 0 dBFS on the master fader. Keeping peaks safely below digital zero gives the mastering engineer room to apply processing without causing inter-sample clipping. If you use a limiter for loudness in your mix, please exporting versions both with and without it.
Plugins
Historically, it's been considered best practice to disable all plugins on the master buss (or 2-buss) before sending a mix to mastering. However, this isn’t a hard-and-fast rule.
Creative EQ, compression, and buss processing that contribute to the musical intent of the mix are fine to leave engaged. However, if you are using heavy limiting for loudness, include one version with it and one without it.
LISTEN TO RENDERED MIXES CAREFULLY
After exporting, listen to the actual rendered files outside of your DAW on the system you know best. Pops, clicks, distortion, rumble, buffer underruns, bad crossfades, or sibilance can appear during rendering. Catching these issues early prevents them from becoming exaggerated after mastering.
Let the Song Finish
Make sure your bounce includes the full reverb tail, instrument decay, and room ambience at the end of the song. Do not cut the file off early because the waveform looks like it has ended. What looks like silence on a waveform often contains audible content: a decaying room, a fading reverb, the last breath of a sustaining note. A file that ends abruptly before the natural decay is one of the most common and avoidable delivery problems, and fixing it means a new bounce and a new session.
Leave Your Tops and Tails
Leave a second or two of natural silence or natural room noise before and after each song. Do not trim it, fade it out, or clean it up before sending. If noise reduction is needed anywhere in the project, a clean sample of just the noise floor is what makes it possible to do that work transparently and without artifacts. Trimming the heads removes that sample entirely. The mastering engineer will handle the final cleanup of heads and tails as part of the session. Leave that work to them.
Analog Tape
For mixes on analog tape, please provide proper alignment tones (at least 100 Hz, 1kHz, & 10kHz at 0VU) and information about tape speed, reference level, EQ standard, mix titles/timings, and location of tones.
Also include details on tape formulation, noise reduction used (e.g., Dolby A, SR), and any specific calibration notes could further assist in accurate playback and digitization.
Send Instrumentals at the Same Time
If there is any chance you will need instrumental versions for sync licensing, TV, film, or other uses, send them alongside your main session. Mastering an instrumental at the same time as the main version adds minimal time to the session and ensures the two masters are processed consistently. Coming back months later to master instrumentals separately is a different situation entirely. Settings drift, analog gear does not recall perfectly, and most engineers charge for the additional session time. Do it once, do it right.
Communicate Your Creative Goals
The more communication, the better. Seriously. What helps me most as a mastering engineer is clear articulation of what you are going for as an artist or producer. Depending on the direction, these gestures may subtly massage the tone or it may have a significant impact on the sound of your song. You also may not have any specific direction or thoughts for mastering your record, and that’s ok too!
Archive Your Masters
When you receive your masters, back them up in at least two places immediately: cloud storage and a local drive at minimum. Your mastering engineer keeps archives, but those archives are not your backup plan. Hard drives fail, studios close, and people move on. Archive the highest resolution versions you receive: 24-bit WAV files, and a DDP image if you pressed CDs. Storage is cheap. Remastering is not.
Don't Overthink It
Strive for the best possible feeling, then print the mix. Over-scrutinizing waveforms and meters can distract from the actual process of making music. In other words, use your ears and not your eyes. Remember, part of the process is understanding when to let go, and trusting in the quality of your work and your mastering engineer.
