Let it Bleed: If you make music using microphones, then it’s time to make friends with overspill.

Photo by Israel Palacio on Unsplash

Beatles record producer George Martin once commented that using any more than a single mic to record an instrument compromises audio quality. Why? Well, it has a lot to do with the multi-directional nature of sound.

Upon reaching a microphone’s diaphragm (the mechanical equivalent of your eardrum) sound waves originating from any given source get summed together with echoes of themselves reflecting off adjacent surfaces. Depending upon the relative strength of the direct sound, the reflections, and the staggered times by which they arrive, each partially reinforces or cancels each other out to varying degrees. As a consequence, even small changes in mic placement can produce an easily discernible difference.

Once a second mic is used in the same vicinity, the direct sound it receives functions as a high amplitude/small-delay echo of the first. In theory, this could all add up for the better – and indeed, stereo mic techniques such as XY, ORTF, Blumlein and so on use these naturally occurring amplitude and ‘phase’ relationships to positive effect – but left to chance, two open mics do not usually sound as good as one.

When one factors in how the electromechanical design of various mics influences their performance, it’s easy to understand why recording engineers place such importance upon microphone choice and placement. Different mics will vary markedly with respect to sensitivity across the audible frequency spectrum, directionality, and reaction time to changes in air pressure. Many mics also feature changeable parameters, allowing their performance to be optomised for different recording situations.

Post-production choices will further impact phase-related issues: For eg., Will each signal emanate from a separate speaker, be blended across the imaginary stereo ‘soundstage’, or sound equally loud out of both (i.e. be summed to ‘mono’)? The interaction between each discreet mic signal will simply be a product of the degree by which each attempts to push or pull any one speaker at any given moment. Start adding further mics (such as when recording a drum kit) and all those individual sonic ‘colours’ may well mix together to produce the audio equivalent of mud.

If you can’t beat ’em, join ’em.

Even for music producers who work primarily ‘in-the-box’, mics are often needed for tracking vocal overdubs. Here, room acoustics, environmental ambient noise and headphone bleed still pose problems. While the first two issues can be addressed using relatively insensitive dynamic cardioid mics, (portable) diffusers and hi-pass filters, headphone spill is somewhat harder to eradicate. But is it really worth the trouble?

A common complaint made by young artists after having made their first recording in a studio is how the end result sounds too ‘clean.’ Many end up preferring their own home-made demos to the remade ‘broadcast-quality’ versions. Engineers and performers, it would seem, so often have competing interests: clarity vs. ‘vibe’. This is understandable, given that engineers don’t want to be misjudged as incompetent and performers don’t want to promote records that aren’t representative of their aesthetic sensibilities.

Noise, distortion, and technical limitations were once inseparable from the studios where the roots of today’s popular music arose. As a result, so many of the recordings indelibly stamped into our collective audio consciousness endure, not in spite of their technical limitations but, in no small way, thanks to them. What was once necessity now informs purely aesthetic choices. Sounds that were once undesirable by-products of makeshift studios and self-trained recordists have come to signify a ‘legitimacy’ and ‘outlaw’ chic, like faded pre-torn denim in a upmarket boutique.

Making mic bleed your friend

A much overlooked aspect of the recordings of yesteryear is ‘overspill.’ Limited available tracks on tape recorders meant that performers had to play the bulk of their music together in close vicinity. Despite the use of baffles, a high degree of mic ‘bleed’ was always present, and consequently gave these records a sound that so often eludes those who would recreate it. Like so many things, however, there is good spill and bad spill.

In the case of recording using a single microphone, judgements can be made relatively easily (given sufficient time). Plug in, move the mic – and/or the performer – around to hear the variety of sounds on offer. Try different rooms, different mics and variations at the source (different amplifier settings, different plectrums, strings or drum sticks). Maybe drape tea towels over drums, or put foam dish-washing pads under bass strings. Ask performers to sing or play softer or louder to change their timbre.

When a second mic is added, it should be judged together with the first mic still open, so their blend can be heard from the get-go. In this way, overspill is simply ‘factored in’ for positive effect rather than eliminated.

If it sounds good, it is good.

If such a scenario seems daunting and has you running back to the safety of your samples collection, then take solace in the knowledge that addressing such issues empirically is a reliable strategy. Even though experience will eventually inform time-saving ‘go-tos’ and a sense of where best to look for sonic bliss, one shouldn’t forget that only hearing is believing.

Oh, and by the way, depending on the type of audio feedback that the performers are receiving – for e.g. headphones, no headphones or live PA-style speakers-in-the-studio (believe it or not, a great many albums have been made using PA-style monitors: listen to Elvis Costello’s ‘Blood & Chocolates‘ or Talking Heads’ ‘More Songs about Buildings and Food‘ as cases-in-point) – not only will bleed be a factor, but their performance, articulation and timbre will vary as a result.

Watch this informative video from ‘Sound On Sound’ magazine to hear how microphone placement, and the number of microphones used, influences recording and performing. Whether you use only one microphone (or one hundred) on your next project the issues raised herein will be pertinent. Enjoy.

If you use microphones as part of your music-production process, then this video from Sound On Sound magazine will be enlightening, regardless of what style of (popular) music you make.
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‘The fetters of tormented mankind are made of red tape.’

I was watching David Cronenberg’s film Naked Lunch last night. I haven’t seen it since its cinema release back in the 1990s. I must confess I went to see it at the time for the wonderful Howard Shore/Ornette Coleman musical score as much as anything else. I was curious to see if it would still have the same (somewhat disturbing) impact that it had on me all those years ago. Yes and no. The impact was there but of a wholly different kind.

Whereas, I had originally interpreted the wry horrors of William S. Burroughs’s landmark work (upon which the film is partly based, along with Burroughs’s journey leading up to writing the book) as the inspired ramblings of a narcotically numbed schadenfreude; now I saw detachment and cool-headed observation of a more journalistic (though of a hazy surreal) kind. In particular, I was surprised that I hadn’t made the somewhat obvious connection between Burroughs’s novel and Kafka’s Metamorphosis, given all the bugs.

So, this morning, I thought I’d do a quick search to see if Burroughs was in fact alluding to Kafka’s work in The Naked Lunch and found the following wonderful journal article ‘”One of the Great Early Counselors”: The Influence of Franz Kafka on William S. Burroughs’ by Adam Meyer at JSTOR online. If you’d like to read it for free, you can at https://www.jstor.org/stable/40246758 without the need to subscribe (at the moment).

I highly recommend reading Meyer’s article particularly if you have ever thought that books like The Naked Lunch overstep the mark when it comes to shock-tactics. After all, there is nothing in it you won’t see in your daily news bulletin (anthropomorphic transformations coming soon: give or take 50 years 😉 ). As the rockband Skyhooks once sang: “It’s a Horror Movie right there on my TV…shocking me right out of my brain…it’s the 6.30 news”.

Try it. Open up any reputable online news site (for example: https://www.abc.net.au/news/), read what has been served up to for your consumption and delectation: Kafka and Burroughs begin to seem like optimists. As Jack Kerouac said when explaining why he came up with the name ‘Naked Lunch’ as an appropriate title for Burroughs’s tome: you get to see what’s really on the end of your fork.

One might well feel ‘triggered’ after reading some of Burroughs’ more unsavory passages, there is, however, equally the invitation to wake up from numbness and complacency. There is, also, the possibility that one might resolve to choose autonomy in place of being a social and cultural automaton. Does the daily news bulletin invite the same reaction? Indignation and self-righteousness are more likely responses.

Meyer’s most timely observation (keep in mind this article was written some 30 years ago) is perhaps:

Burrough’s is “trying to define what it is that’s really anti-human and evil, and he basically pinpoints it in the self-righteous, censorious, repressive mind,” the same place Kafka located it.

He continues: The reason this mind set is so evil is that … it always requires one person’s being under the domination and control of another person or force. (1990 p. 215-16)

Having been born in what is a former penal colony (Australia) and having spent the formative years of my life living in a ‘police state’ and seemingly perpetual ‘state of emergency’ (i.e. Queensland as ruled by premier Joh Bjelke-Peterson for some 20 years!!) I can attest to the truth in Burroughs words when he says that ‘… a functioning police state needs no police.’ Bureaucracy, paranoia and conformity, on the other hand, are essential components.


Burroughs, W. S. ([1959] 2016). The Naked Lunch. Penguin Classics.

Kafka, F. ([1915] 2013). Metamorphosis. Random House US Group.

Meyers, A. (1990). ‘”One of the Great Early Counselors”: The Influence of Franz Kafka on William S. Burroughs’, Comparative Literature Studies Vol. 27, No. 3 (1990), pp. 211-229 (19 pages).

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