Mastering is the final stage before your music is released. It’s the moment where the track stops being “a mix” and starts feeling like a finished record.
It’s not about changing what you made. It’s about bringing it into focus, so it translates across systems and spaces while keeping the character of the mix intact. Clarity, impact, balance, and consistency, without flattening the life out of it.
For singles, mastering helps the track land the way you intended. For EPs and albums, it’s also about cohesion. Making sure the songs belong together, with a consistent level, tone, and flow from start to finish.
Masters can be prepared for digital distribution and streaming, and we also offer full album CD mastering when you need it. If you’re only mastering one track, our per-song online mastering service is available too.
Mastering is a mix of listening, judgment, and small decisions that add up.
It starts with finding what the track is asking for, then making the moves that help it translate. Sometimes that’s subtle. Sometimes it’s a little more hands-on. The work changes with the genre, the mix, and the intention, but the goal stays the same: keep the life of the music intact while helping it land with confidence.
In practice, that can include:
EQ to shape balance and remove problems
Stereo balance and imaging adjustments
Compression and limiting for control, punch, and level
Automation where different sections need different treatment
Clean fades, track spacing, and sequencing for releases
Dither when delivering the right formats
Noise reduction or restoration when needed
Delivery-ready files for streaming and digital distribution
ISRC and metadata when required
CD deliverables like CD-Text and DDP (plus BIN/CUE if needed)
Stem mastering is mastering with more access.
Instead of working from a single stereo mix, the music is delivered as a small set of grouped parts, or stems. That lets us get deeper into the balance and make more targeted moves, without turning the process into a full remix.
For most releases, standard stereo mastering is the right choice and delivers excellent results. Stem mastering is for the cases where a mix needs a little more control than a stereo file can give, or when you want the mastering stage to have more flexibility with key elements.
You’ll send a handful of stereo stems that represent consolidated groups of instruments. For example: drums, bass, music, vocals, and FX. We’ll work with each stem to refine levels, tone, and dynamics, then combine them into the final master. The goal is the same as always, a finished, consistent, release-ready record, just with a few more options along the way.
Audio mastering is the art of giving your recording a cohesive, finished sound.
It’s about making sure the music translates. Home stereo, car, club, headphones, radio, streaming. The track should hold together everywhere, and it should stand confidently alongside other releases in its world.
The final masters also need to be technically solid. Clean, artifact-free, no unwanted distortion or clipping, and delivered in the right formats for release.
Aesthetic choices matter, but the purpose stays the same: to present the music at its best, with clarity, impact, and consistency, without losing what makes it yours.
When preparing your mix for mastering, a few small choices make a big difference.
First, leave some headroom. Aim for your loudest peaks to sit around -3 dB to -6 dB, and make sure nothing is clipping, including inter-sample peaks. It should feel a little quieter than a finished release. The final level happens in mastering.
Second, remove any master-bus processing like limiters or compressors, unless it’s genuinely part of your sound and you can’t imagine the mix without it. If you’re unsure, send two versions, one with processing and one without.
Third, export a high-resolution WAV or AIFF.
You can read more about preparing your mix for mastering.
Yes, if there’s no other option. But it’s not ideal.
If you can send a WAV or AIFF, you’ll get a better result. Those formats keep the full detail of the mix, which gives mastering more room to work cleanly.
An MP3 is lossy, meaning parts of the original audio are removed to reduce the file size. We can still master it and aim for the best possible outcome, but the final master will always be limited by what’s in the file.
Turnaround depends on studio workload, but most projects are returned within 3–5 business days. Exact timing varies by service, and by how many songs need to be grouped together.
Neptune Mastering clients can use Smash to upload projects securely. Upload links auto-delete after a week.
If you prefer a different file transfer service, that’s fine too.
Finished masters are delivered via Google Drive, so you can access your files whenever you need them.
DDP is the format we use when a release is heading to CD replication.
Think of it as the finished “disc image” of your album. Not just the audio, but the track order, spacing, PQ data, and any CD-Text or ISRCs that need to be there. It’s the standard way plants prefer to receive a master, because it’s consistent and dependable.
Compared to sending an audio CD-R, a DDP is simply more reliable. It can be delivered online, it doesn’t rely on how a disc was burned or how it reads on different drives, and it can be checked before anything gets manufactured.
We include an MD5 checksum with the DDP file set so the plant can verify that everything arrived intact and unchanged.
If you’re replicating CDs, a DDP Image is the one to use.
An untreated room will pull you off course.
The frequency response is uneven, so what you hear is being shaped by the space as much as the speakers. That makes it easy to over-correct problems that aren’t really in the mix, and miss problems that are. Translation becomes guesswork.
It’s not only a mixing issue either. Record acoustic instruments in an uncontrolled room and the room prints itself onto the take. Sometimes that’s character. More often it’s boxiness, ringing, and a kind of midrange “honk” that follows the recording everywhere.
If you want mixes that travel well, and recordings that feel true to what you captured, the room matters. Even with great gear.
There are a number of audio mastering tips that will help you prepare your mixes before working with a mastering studio. It’s important to know how to prepare and submit your mixes so you can get the best sound for your songs. The mastering engineer wants to start with a clean slate, primarily on the master bus and will need to have the proper file type and format to get the most from your music.
As you go through your mix eliminate any noise or pops that may be in each track. Use fades as necessary to cut out any spots that may just be containing recorded noise. If this is done in the mix stage within each track, it will keep the overall noise level down when the mastering engineer begins to equalize and compress the mix.
Overusing processors especially dynamic processors (compressors) on the master bus can destroy a mix and make it difficult, if not impossible for the mastering engineer to make a great master. Unless there’s a specific sound of a master bus processor desired for the mix, it’s best to keep the master buss free of outboard processing or plugins. If master bus processing is used make sure to notify the mastering engineer of its type and settings.
The loudest part in a mix should peak at no more than -6db on the master bus. Also know that dynamic range is not the same as peak levels on your mix. Dynamic range, in simple terms, is the difference between the loudest part of your song and the quietest.
Try to aim for about -14 to -10 LUFS or less in your pre-master. Use a Dynamic Range Meter to see your results (Youlean Loudness Meter). A standard meter will not show you the results you need to know.
We also ask that pre-masters fall within the range of -6 dB, or at the very most -1 dB True Peak. -6 dB is generally a good guideline to be sure your track is clipping.
There should never be a limiter set on the master bus. Final dynamic control and level should be left to the mastering engineer. This allows the engineer to create the proper dynamic level for radio play, CD, or MP3 duplication.
Only one song per order, please. Full versions and edited versions are considered as two songs, no matter how similar they might be. Equal amounts of work still need to be done for each song in mixing and/or mastering.
Some terminology to know:
Lossy file formats should never be used when submitting an audio file for mastering.
The two most popular file types for mastering are WAV and AIFF. Both of these file types are lossless (non-compressed/converted), and either file type is excellent for a mastering engineer to work with. AIFF files are normally used on Mac systems, while WAV files are traditionally PC. Make sure your mastering studio is able to work with the format you have.
Additional to using WAV or AIFF file types. When submitting a mix for mastering. The file should be kept in the same resolution as it was mixed in (no down conversions).
For example a song mixed at 24bit 96kHz should be submitted as a 24bit 96kHz file (WAV or AIFF).
Submitting any previously done mixes or masters of the songs to be worked on, along with a few different reference songs that have a similar sound desired, is excellent for giving the mastering engineer an idea of your musical vision. This could be a reference to bands/releases that inspire you, or that have a similar sound you like.
Mastering from stems is becoming a more common practice. This is where the mix is consolidated into a number of stereo stems (subgroups) to be submitted individually. We accept up to 8 stems per song. For example, you might have different tracks for Kick Drum, Drums, Bass, Keys, Synths, Effects, and Vocals. This gives the mastering engineer excellent control over the mix and master, allowing for the absolute best sound possible. However, it’s a substantially more involved process. If a mix from stems is desired, following the same steps listed above is best for each stem.
Note: When submitting stems, each file must start at the same time in the song, even if each of the stems’ audio regions starts at a different time.
In addition to our standard mastering service, we also offer stem mastering for clients who want our mastering engineer to have more control during the mastering process. For the majority of projects, standard stereo mastering will provide excellent results, however for artists who prefer to give our engineers the most possible control over their mix we also offer stem mastering.
Mastering from stems allows us to dive deeper into the mix and more finely adjust frequencies and levels. It also allows us more control to correct problems in the mix that might otherwise be impossible with a single stereo file.
When mastering from stems you will submit multiple stereo tracks that have consolidated instruments. For example, an artist might submit 4 stereo WAV files (One containing all lead synths/guitars, one with lead vocals, one with drums, and one with background vocals, etc). Our engineers would then work with each stem to set frequencies, adjust levels, and correct any imperfections. When they finish, the stems are combined and the final song is then mastered.
Since we have access to separated groups of instruments there are more options for the engineer to make finer adjustments and correct issues.
Preparing a mix for stem mastering involves grouping your instruments into individual stems. We accept up to 8 stems per song, and as a general rule, you want to group similar instruments together. An example set of stems would be: Percussion, lead vocals, backup vocals, rhythm guitars, lead guitar, kick and bass.
The stems you submit can be separated in any way that will give our engineer the best options to work with for your project. As with all mastering projects you should leave -6db of headroom and remove any master bus processing from each stem.
Stems should all be the exact same length and start and stop at the same time (this is crucial so the tracks line up when they are mixed together).
Our mixdown service brings you to stem mixing at an affordable price. We will ensure that your track is mixed down from your supplied stems to the professional standard and sound that you need. Audio mixing will ensure your music is mixed by a professional engineer who will bring a fresh pair of ears to your project and use the best technology to ensure a final mixdown that will give your track a professional edge that’s ready for mastering.
If you are struggling to get that polished professional sound on your mixdown then this service is for you!
Tracks are generally returned to the customer as stereo 16bit 44.1kHz WAV files with -6db of headroom ready for mastering. If you would like your track supplied with more or less headroom than -6db please feel free to add this as a note to your order.
Audio mixing is the process of taking recorded tracks and blending them together. Tracks are blended using various processes such as EQ, Compression and Reverb.
The goal of mixing is to bring out the best in your multi-track recording by adjusting levels, panning, and time-based audio effects (chorus, reverb, delay, etc). The aim is to sculpt your arrangement to make sense of all your tracks in relation to each other.
A multitrack recording is anything with more than one individual track (also referred to as stems). There’s no right or the wrong number of tracks. The final output of a multitrack recording is also known as the mixdown. The mixdown is the final step before mastering.
Lacquer cutting is the process of transforming an audio recording into physically cut grooves on the surface of a lacquer disc via a machine called a lathe. This cut lacquer is used as the master in the electroplating process to create stampers which are then used to press your record. The lacquers are sent directly to your pressing plant.
When ordering lacquer cutting, you can choose to have us master your music or provide your own mastered files.
We highly recommend having us master your music for cutting your Lacquer Discs.
We have all the experience and settings on hand to make sure your music will be perfectly matched to the NEUMANN VMS70 Cutting Lathe used.
When using Neptune Mastering, we can be sure that the end results will provide you with the best possible results in making your audio better.
If you choose to provide your own masters for Lacquer Cutting, here are some tips for a great-sounding record: