Mix levels & cut volume explained.
One of the most common questions before a lathe cut order is about level. How loud should a vinyl master be? What does a cutting level actually mean? This guide explains what the lathe is responding to and what you can do to get the best result.
What “cutting level” actually means
Cutting level is the amplitude at which the cutter head engraves the groove. It is not the same as playback loudness, and it is not determined by a LUFS figure. It is determined by the physical behaviour of the programme material at the lathe.
A higher cutting level means wider, deeper groove walls. Wider grooves require more physical space on the disc. The more space each groove takes, the fewer grooves fit, and the shorter the maximum side length. A lower cutting level means narrower grooves, less physical space used, longer possible sides — but a quieter record on playback.
The cutting level for your order is not set arbitrarily. It is set as high as the programme material safely allows, given the format, the side length, and the specific content of the audio.
What limits the cutting level
Several factors limit how high a cutting level can be set for a given programme:
- Low-frequency excursion. Deep bass requires wide groove walls. Very heavy sub bass, particularly if present in stereo or out-of-phase, is the most common reason a cutting level has to be reduced significantly.
- High-frequency velocity. Very fast, repetitive high-frequency content — sibilance, bright hi-hats, sharp transients — creates demands on the cutter head that are separate from amplitude. Even at a modest level, this content can require the cutter head to move faster than is reliably achievable. See Sibilance and vocals on vinyl.
- Side length. The longer the side, the tighter the groove spacing must be, and the lower the practical cutting level. A six-minute 12″ 45 RPM cut can run considerably hotter than a twenty-minute 33⅓ side.
- Programme density. A continuously dense, busy mix leaves less room for dynamic peaks. A track with natural dynamics and headroom gives the lathe more to work with.
- Limiting and compression. Heavily brickwalled masters suppress the natural dynamic structure that vinyl responds well to. The groove has to sustain a high average level throughout, rather than breathing with the music.
The lathe always makes the final decision. Software analysis tools can predict where problems are likely. Test cuts confirm whether the prediction is right. The groove itself — inspected under a microscope and played back on a reference system — is the only reliable measure of whether a cutting level is workable.
LUFS and vinyl: a common misconception
LUFS targets are a useful reference for streaming normalisation. They are not a reliable guide to vinyl cutting level or suitability. A master at −14 LUFS is not automatically vinyl-ready. A master at −8 LUFS is not automatically too loud to cut.
What matters is the character of the audio — the spectral balance, the low-end management, the dynamic structure, the stereo content — not a single integrated loudness figure.
A common mistake: reducing a streaming master by 6dB and describing it as a vinyl master. A quieter version of a digital master is a quieter digital master. It does not change the bass phase, the sibilance, the stereo width, or any of the other programme characteristics that determine whether a cut is straightforward or difficult.
What a good vinyl master looks like
There is no single universal specification. A good vinyl master for a DJ tool 12″ looks different from a good vinyl master for a quiet acoustic album. But some principles apply across formats:
- Bass in mono below ~120Hz. Stereo low-frequency information creates vertical groove excursion which is mechanically demanding and increases the risk of skipping on playback. A mono crossover in the low end is standard practice.
- Controlled sub bass. Energy below 40–50Hz contributes little to perceived warmth on vinyl and requires significant groove space. A gentle roll-off or high-pass filter in this range is common.
- Managed sibilance and high-frequency transients. Sharp, repetitive high-frequency energy is addressed before cutting. This is better done upstream by a mastering engineer than corrected at the lathe.
- Headroom preserved. Peaks that hit 0dBFS or clip in the digital domain become a problem in the groove. Aim for peaks no higher than −1 to −0.5dBTP on the final master.
- Phase checked. Listen in mono. The low end should remain solid and present. Significant mono collapse in the bass region indicates a phase problem that will cause groove and playback issues.
- Natural dynamics. If an alternative version of the master is available with less limiting, it will usually cut better and sound better on vinyl.
What happens at the lathe
Before cutting begins, the programme is assessed. The cutting level and groove pitch are set based on the specific content — not a default profile applied to every order. Test cuts are made, inspected, and played back before the production run begins.
If a cutting level has to be significantly reduced to accommodate the programme, this will be noted. If the programme cannot be cut at a workable level without compromising quality, the session may pause and a revised master requested.
Vinyl preparation — available at £35 per order — covers the engineering work of optimising a standard digital master for cutting. It is required for standard streaming or CD masters and is not optional for those files. What vinyl preparation covers.