How to Check Your Mix Before Sending It to a Mastering Engineer

You’ve finished the mix. You’re happy with it. You’re about to bounce.

Wait five minutes. Do these checks first. They catch most of the common problems that limit what mastering can achieve.

Step 1: The mono check

Press the mono button on your monitor controller or DAW. Listen through the entire mix in mono.

Does the bass lose significant level? Phase problem in the low end — fix it before bouncing.

Does the mix collapse or become hollow? Phase problems across multiple elements.

Does the vocal suddenly seem wrong — much louder or quieter than in stereo? Stereo inconsistency that will cause translation problems.

A mix that holds together in mono almost always holds together everywhere. A mix that falls apart in mono will have problems.

Step 2: The headroom check

Look at your mix bus output meter at the loudest section of the song. Where is it peaking?

If it’s hitting -0.1 to -1dBFS: it’s too hot. Reduce the master fader or the input gain on your master bus compressor.

Target: -3 to -6dBFS peak level. This is what a mastering engineer needs.

Step 3: The limiter check

Is there a limiter or hard clipper on your master bus? Bypass it. Export without it. The mix file that goes to mastering should be clean and dynamic — not limited.

If you’ve been using a limiter for monitoring purposes, bypass it before the final bounce. Every time.

Step 4: The small speaker check

Play the mix on a phone, laptop, or Bluetooth speaker. Can you still hear the bass? Is the vocal clear? Does the arrangement still make sense without the low end and width of your studio monitors?

If the bass disappears, there may be a phase issue or the bass energy is concentrated in sub frequencies that small speakers can’t reproduce.

Step 5: The fresh ears check

Before bouncing, take a break. Even 20 minutes. Come back and play the full mix from the beginning.

Is there anything that immediately bothers you? Any element that feels too loud, too quiet, too harsh, too dull? With fresh ears, problems that were invisible after hours of mixing become obvious.

Fix those things. Then bounce.

Jacob Korn at tailout.de asks all clients to do these checks before sending. A mix that arrives after these steps is almost always in better shape — and mastering becomes more about enhancement and less about fixing avoidable problems.

Ready to send your mix? Visit tailout.de — professional mastering that starts with a conversation about your mix, not just the file.