Stereo Width in Electronic Music: How Wide Is Right?
Stereo width describes how your mix uses the left-right stereo field. TrackScore™ measures it as side energy above 200 Hz and calls it healthy up to about 39%, wide from about 40% and very wide above about 59%, where elements may cancel when a club system sums to mono. Narrower is never penalized: it is the most mono-safe, and below about 8% a mix simply sounds close to mono. The key rule: sub-bass must be mono, everything else can spread.
What Is Stereo Width?
Every stereo signal can be decomposed into two components: mid (what's identical in both channels) and side (what differs between left and right). Stereo width is the ratio of side energy to total energy.
A mono signal has zero side energy — everything is identical in both channels. A hard-panned element has maximum side energy — left and right are completely different. Real mixes sit somewhere between, with kicks and bass centered and reverbs, pads, and effects spread wide.
Width matters because it determines how immersive and spacious your mix sounds on speakers, headphones, and club systems. A narrow mix is never a technical fault, though it can feel less spacious. Too wide and it falls apart on mono playback, which includes many club PA systems, phone speakers, and Bluetooth speakers.
Why Sub-Bass Must Be Mono
Below 100–150 Hz, stereo information causes phase cancellation when summed to mono. The wavelengths are so long that even small timing differences between left and right channels create destructive interference — your bass literally disappears.
This isn't a theoretical problem. Many club PA systems run mono below the crossover point (~100–120 Hz). Phone speakers are mono. Many Bluetooth speakers are mono. If your sub-bass has stereo content, it will partially cancel on these systems — and your track will sound thin where it should hit hardest.
Production tip: Put a utility plugin in mono mode on your sub-bass channel. Or use a mid/side EQ to cut the side channel below 150 Hz on your master bus. This ensures your low end is mono without affecting the stereo image of everything above.
This is also why TrackScore.AI™ applies a 200 Hz high-pass filter before measuring stereo width. Without the filter, tracks with heavy mono sub-bass would show artificially narrow readings — the massive mono energy below 200 Hz would swamp the genuine stereo content happening in the mids and highs. The filter gives you an accurate picture of how your mix actually uses the stereo field.
Ideal Stereo Width for Electronic Music
| Width Range | Assessment | What It Means |
|---|---|---|
| Up to about 39% | Healthy | Balanced or narrow, with plenty of center for mono playback. Narrow is never penalized: below about 8% the image is almost mono above 200 Hz, and the report calls it narrow and mono compatible. The reading cannot see below 200 Hz, so sum to mono in your DAW to check the low end. |
| About 40% to 59% | Wide | Flagged in the report. Check that the low end and lead elements stay centered and that the mix holds up in mono. |
| Above about 59% | Very wide | Elements may cancel in mono. Keep bass and kick centered and narrow the sides. |
How to Fix Stereo Width Problems
Want More Width? (Narrow Is Not a Fault)
A narrow mix is never marked down, so only widen it if the track needs more space. If it does:
- Pan elements: Spread hi-hats, percussive layers, and FX across the stereo field instead of leaving everything at center.
- Use stereo reverb/delay: Short stereo reverbs and ping-pong delays add width to otherwise mono elements without changing their character.
- Double and detune: Duplicate a synth layer, pan copies L/R, and detune slightly (±5–10 cents) for instant width.
- Mid/side EQ: Boost the side channel above 2 kHz to add air and width to the high end without affecting the low-end center.
Too Wide (Flagged From About 40%)
- Check mono compatibility: Solo the mid channel and listen — if important elements disappear, they exist only in the side channel and will vanish on mono systems.
- Narrow the bass: If bass elements have stereo content, mono them below 150 Hz using a utility or mid/side EQ.
- Reduce stereo processing: Pull back stereo wideners, chorus, and unison spread on lead and pad synths.
- Center critical elements: Kick, bass, lead vocal/synth, and snare should be centered. If they're panned or widened, pull them back.
Stereo Width by Genre
Different genres use the stereo field differently:
| Genre | How Wide | Why |
|---|---|---|
| Minimal / Deep Techno | Narrow | Deliberate restraint — hypnotic center focus |
| Tech House | Narrow to moderate | Moderate width from percussion and FX layers |
| Deep House | Moderate | Wider pads and reverbs for atmospheric warmth |
| Melodic House / Progressive | Moderate to wide | Lush synths and long reverb tails create wide soundscapes |
| Trance | Wide | Supersaw leads and layered pads push the stereo image wide |
| Ambient / Downtempo | Widest | Maximum immersion — mono compatibility less critical |
These describe how genres tend to use the stereo field; they are not TrackScore™ targets. The report judges width the same way for every genre, so a trance or ambient track above about 39% is flagged as wide. Take that note as a prompt to check the mix in mono.
How Stereo Width Affects Your Mix Score
In TrackScore.AI™, stereo width feeds two parts of the Mix Quality score, a width check and a check on how well that width holds up in mono, alongside loudness, dynamics and clipping. A narrow mix loses nothing. A very wide mix gives up some Mix Quality, more the wider it gets, which can be enough to tip a grade when a track sits near a boundary.
Stereo width also interacts with frequency balance. TrackScore™ measures the spectrum on a mono sum of your mix, so bass or sub content that is out of phase between left and right partly cancels there and can read as a light low end. The width reading itself is taken above 200 Hz and cannot see that problem, so check the low end in mono in your DAW. Keeping the low end mono can improve frequency balance as a side effect.
Related Guides
- Frequency Balance in Electronic Music — The 7-band spectrum profile your mix should target
- What LUFS Should Your Track Be? — Loudness targets for club and streaming
- 10-Point Mix Improvement Checklist — Complete pre-mastering QC including stereo width
- What Is Track Analysis? — How stereo width fits into full mix evaluation
Frequently Asked Questions
What is stereo width in mixing?
Stereo width is how much your mix uses the stereo field from mono (center) to wide (hard left/right). It's measured as a mid/side energy ratio — the balance between what's identical in both channels (mid) and what differs between them (side). A wider mix has more side energy relative to mid.
Should sub-bass be in mono or stereo?
Sub-bass should always be mono. Frequencies below 100–150 Hz in stereo cause phase cancellation when summed to mono, which happens on many club PA systems, phone speakers, and Bluetooth speakers. Mono sub-bass ensures your low-end translates everywhere.
What is a good stereo width for electronic music?
Up to about 39% is healthy, measured as side energy relative to total energy above 200 Hz. From about 40% the analysis report flags a mix as wide, and above about 59% as very wide, because wide elements start to cancel when a system sums to mono. Narrow is never penalized: below about 8% the image is almost mono above 200 Hz, and the report calls it narrow and mono compatible. The reading cannot see below 200 Hz, so sum to mono in your DAW to check the low end.
How does TrackScore measure stereo width?
TrackScore.AI™ measures stereo width using a mid/side decomposition with a 200 Hz high-pass filter. The filter removes mono sub-bass that would artificially deflate the width reading. The result is a ratio from 0 (pure mono) to 1 (pure stereo) that accurately represents how your mid and high frequencies use the stereo field.
Why does my mix sound narrow even though I used stereo plugins?
Common causes: stereo widening on bass elements (which gets filtered out in proper measurement), heavy mono-summing on the master bus, too many elements sharing the center of the stereo field, or phase correlation issues that cancel side information. Check that your reverbs, delays, and pads are providing genuine stereo content above 200 Hz.