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Sub-Bass Mono Maker

· Last updated：2026-09-17

Fold everything below your crossover to mono while keeping the stereo image above it — the elliptical-EQ move that protects vinyl cuts and mono-sub club systems.

Details

What this tool helps you do

Implements the mastering technique known as elliptical EQ exactly the way vinyl cutting engineers do: the stereo SIDE (difference) signal is high-passed at your crossover while the MID (sum) stays full-range, then L = MID + SIDE and R = MID − SIDE are reconstructed. Below the cutoff the side channel carries almost nothing, so L and R collapse to identical mono with no level change; above it, the original stereo image passes through untouched. The slope (12/24/48 dB per octave) controls how hard the transition happens. Before rendering, the tool decodes the track and measures mid and side energy below the cutoff plus the L/R cross-correlation, so you can see how much out-of-phase low end you actually had; after rendering it re-measures the output and reports the achieved side-band suppression and the new near-perfect below-cutoff correlation. Mastering guidance: keep the crossover conservative (80–150 Hz for most programme material; monoing everything below 300 Hz throws away real width).

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Written by the Elysia Tools team

Tool usage guide

Learn when to use this tool, what it supports, and how real users apply it.

Key facts

Category
Media
Input types
file, number, select
Output type
file
Sample coverage
4
API ready
Yes

Overview

Sub-Bass Mono Maker uses mid/side elliptical EQ processing to collapse low-frequency audio to mono below a chosen crossover while preserving the original stereo width above it.

When to use

  • Preparing club masters to ensure solid low-end playback on mono subwoofer sound systems.
  • Mastering tracks for vinyl lathe cutting to eliminate vertical stylus excursions caused by out-of-phase bass.
  • Fixing stereo phase cancellation issues in wide synth patches or multi-mic drum bass recordings.

How it works

  1. 1The stereo input is decoded into MID (sum) and SIDE (difference) components while measuring sub-band stereo correlation.
  2. 2A high-pass filter with a 12, 24, or 48 dB/octave slope is applied exclusively to the SIDE channel at the specified cutoff frequency.
  3. 3Left and right channels are reconstructed using sum-and-difference math (L = MID + SIDE, R = MID − SIDE) and exported in your selected audio format.

Use cases

  • Electronic music producers tightening kick drums and 808 basslines for club sound system playback.
  • Mastering engineers prepping vinyl premaster files to comply with mechanical cutting head constraints.
  • Mixing engineers eliminating wide chorus or stereo widening phase anomalies in sub-bass layers.

Examples

1. Club Master Sub Tightening

Electronic Music Mastering Engineer

Background

A dance music mix contains wide stereo chorus modulation on the synth bass, causing low-end phase cancellation on club subwoofers.

Problem

Out-of-phase low-frequency energy makes the bass sound hollow and weak in mono playback environments.

How to use

Upload the final mix, set the cutoff frequency to 150 Hz, select the 48 dB/oct filter slope, choose WAV format, and render.

cutoffHz: 150, slope: '48', outputFormat: 'wav'

Outcome

Collapses sub energy below 150 Hz to pure mono with near 1.0 phase correlation while preserving the wide stereo upper harmonics.

2. Vinyl Lathe Cut Preparation

Vinyl Mastering Engineer

Background

A rock mix contains panning differences in low-frequency floor toms and bass guitar that risk causing stylus skips during vinyl playback.

Problem

Antiphase low frequencies generate excessive vertical groove excursions during the lacquer cutting process.

How to use

Upload the unmastered stereo track, set cutoff to 90 Hz with a gentle 12 dB/oct slope, select FLAC output, and process.

FAQ

What is an elliptical EQ?

An elliptical EQ high-passes the stereo side (difference) channel below a set cutoff so that low frequencies collapse into identical mono while higher frequencies retain full stereo width.

What crossover cutoff frequency should I choose?

Setting the crossover between 80 Hz and 150 Hz works best for most programme material; setting it above 200 Hz can unnecessarily narrow lower-mid instruments.

Which filter slope should I select?

Use 24 dB/oct for general mastering, 12 dB/oct for gentle vinyl mastering transitions, or 48 dB/oct for sharp club-ready sub-bass isolation.

Does monoing the sub-bass change overall track volume?

No. The MID (sum) signal remains full-range and unaltered, meaning center-panned low-end energy maintains its original balance.

What output audio formats are supported?

The processed audio can be exported to MP3, WAV, FLAC, M4A, or OGG Vorbis.

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cutoffHz: 90, slope: '12', outputFormat: 'flac'

Outcome

Suppresses out-of-phase side-band sub energy below 90 Hz for safe vinyl pressing without altering the mix width above the crossover.