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Mono compatibility
Gazillion Industries ·
The stereo widener made the track enormous. Then it went out on a club
system, a phone, a laptop and a Bluetooth speaker in somebody's kitchen, and on three of those
four the part you widened got quieter or disappeared entirely.
Mono compatibility means your mix still works when the left and right channels are summed
together. It matters because a great deal of real-world playback is mono or close to it, and
because summing is unforgiving: anything achieved by putting the same sound on both sides with a
small time or polarity difference will partially cancel when the two are added. Check in mono
regularly, and treat anything that shrinks as a problem rather than a feature.
The short version
- What
- how the mix behaves when both channels are summed
- Why
- phone speakers, club systems, laptops, many Bluetooth speakers
- Risk
- wideners, stereo delays, and duplicated tracks with offsets
- Safe
- panned sources, genuinely different left and right parts
- Keep centered
- kick, bass, snare, lead vocal
- Test
- a mono button on the master, used often
What actually disappears
Panning is safe. If the guitar is on the left and the organ is on the right, summing them puts
both in the middle at a slightly lower level, and nothing is lost.
What is not safe is width created from a single source. Duplicate a part, delay one copy by a
few milliseconds and pan them apart, and in stereo it sounds wide and impressive. Sum it and the
two copies partially cancel, removing a comb of frequencies and leaving something thinner than
the original mono part you started with. The same applies to most wideners, to stereo
chorus and flanging, and to anything involving polarity inversion between channels.
The underlying mechanism is the same one in phase cancellation: two versions of one sound, arriving at
different times, subtracting from each other.
Where mono still happens
More often than people assume. Phone speakers are a single driver. A lot of small Bluetooth
speakers are one driver, or two close enough together to behave like one. Club and venue systems
are frequently run mono, or are wide enough that no listener is hearing a stereo image. Laptops
have two speakers a few inches apart. And listeners are rarely sitting exactly between two
correctly placed monitors.
You do not need to mix in mono to respect this. You need to check in mono often enough that
nothing in the arrangement depends on stereo to exist.
BEEFY is our
saturation and loudness effect, and it is the right answer to a thin sound only after you have
checked that the thinness is not two tracks cancelling each other.
How to check
- Put a mono button somewhere you will actually press it — on the monitor path, not
buried in a plugin.
- Press it every time you add a stereo effect, not just at the end.
- Listen for elements that get quieter rather than the mix simply getting narrower.
- Keep kick, bass, snare and lead vocal centered, so the load-bearing parts are unaffected
by summing.
- High-pass the sides of any width processing, or restrict widening to above a few hundred
hertz, so the low end stays mono.
- If a part vanishes in mono, fix it at the source: use a genuinely different performance for
the other side rather than a processed copy.
Where it costs you
Strict mono-compatibility is a constraint and constraints cost something. Some of the most
beautiful stereo effects in records are not perfectly mono-compatible, and a producer who refuses
all of them ends up with a narrow, safe mix. The working position is that nothing essential
should rely on stereo: a wide pad that gets smaller in mono is fine, while a hook that disappears
is not.
It is also easy to over-test. A mix that is checked in mono constantly but never enjoyed in
stereo tends to end up correct and dull.
Questions people ask
Should I mix in mono or stereo?
Mix in stereo and check in mono. Some engineers do the initial balance in mono because it
forces clear decisions about level and frequency, then open it up. Either way, mono is a test
rather than a destination.
Why does my mix sound worse in mono?
Almost always because something is cancelling: a widener, a duplicated and offset part, a
stereo effect with polarity differences, or two microphones on one source. Mute things one at a
time in mono until the level comes back.
Is mono audio bad?
No. Mono is simply one channel. A great many classic records are mono mixes and they are not
deficient; they are focused. What is bad is a stereo mix that falls apart when summed.
Does bass need to be in mono?
The low end benefits from being centered, because stereo information down there translates
badly on most systems and can cause problems on vinyl. Keeping everything below roughly 100 to
150 Hz mono is a common and sensible default.
What BEEFY does
BEEFY is a saturation and loudness effect for making sounds thicker, punchier and more up
front. It adds body, squeezes some space out of the peaks, and brings out harmonics that help a
sound feel bigger, which is a genuine way to make a part more present without relying on stereo
width to do it. BEEF brings weight and density, COOK changes
the color and bite, JUICE sets the level going in, and SOFT CLIP
opens switched on to round the loudest parts.
Four playback systems, three of them summing your record. Press the button more often.
Keep reading
BEEFY — saturation and loudness plugin for Mac and Windows. There is
a 28-second demo with three without/with comparisons on the page.
Hear it — $19