Mono and fat analog, in the low end that’s usually not a small thing. If it was small by any bad chance, there are plenty of ways to make it bigger at the mixing phase: e.g. EQ, compression, mono chorus, a second bass sound, etc… In any case, what you don’t want is a muddy low end and stereo apparently gets you easier into that muddy territory.

A sound tech once complained to me that my song was all stereo lanes and therefore difficult to mix. That’s when I first grew aware that mono was perhaps a thing. At first, I did not really understand why it was a big deal though, I thought, “well yeah, synths are stereo by design, of course, aren’t they?” Then I got a Prophet 10, mono only, as well as some books on mixing, and only then I kind of understood the issue. That said, the tech managed to mix and master my song, despite the everything stereo.

To quote some books I’ve read:

“You always want your sub bass in the middle. Never pan your sub frequencies. In fact, set all frequencies below 120hz to mono. You can, however add stereo width to bass frequencies above 120hz.” (excerpt from The Process for electronic music production, Jason Timothy)

“The dominant center is an obvious choice to locate the most prominent music element (like the lead vocal) but also the kick drum, bass guitar and even the snare drum. While putting the bass and kick “up the middle” makes for a musically coherent and generally accepted mix technique, its origins date back to the era of vinyl records.“ (excerpt from The Mixing engineer’s handbook, Bobby Oswinski)

“From a technical standpoint, there are good reasons for putting the most important musical elements of your mix in the middle of the stereo image, because they’ll be the ones that survive best in mono and in situations where only one side of a stereo signal is heard. In most cases, this means that your kick, snare, bass, and any solo lead vocal will normally inhabit the center. This is particularly important for the bass instruments, …” (excerpt from Mixing secrets for the small studio, Mike Senior)

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