{"id":278510,"date":"2026-07-23T09:33:49","date_gmt":"2026-07-23T07:33:49","guid":{"rendered":"http:\/\/biafax.it\/it\/?p=278510"},"modified":"2026-07-23T09:33:49","modified_gmt":"2026-07-23T07:33:49","slug":"phase-reverse-pickup-schema","status":"publish","type":"post","link":"https:\/\/biafax.it\/en\/phase-reverse-reversing-the-phase-of-a-pickup\/","title":{"rendered":"Phase reverse: reverse the phase of a pickup"},"content":{"rendered":"
\"Phase<\/figure>\n

Phase reverse: reverse the phase of a pickup<\/h1>\n

Have you ever wanted to get a sound out of your guitar that isn't there? That slightly thin, almost nasal tone you hear on certain records and wonder how they do it? Or maybe you've installed two pickups from different brands and when you use them together you feel the sound empties, loses body, as if something isn't right? Well, my friend, you might have encountered the mystery of reverse phase<\/strong>, or phase inversion, if you prefer.<\/p>\n

It's not magic, it's electronics. And, I'll tell you right away, it's not an aerospace engineer's job either. It's a modification I've done and redone many times in my garage, sometimes by mistake, other times to find that specific sound. And each time, understanding one more piece of it, I stopped being afraid of soldering and diagrams that look like hieroglyphs.<\/p>\n

The idea is simple: manipulate the way your pickup signals combine. But the “how” and especially the “why” are the essence of it all. If you're willing to get your hands dirty and really understand what's happening under the pickguard, you're in the right place. I'll explain everything, from the basics, with the patience needed when you have a soldering iron in hand and a cable to strip.<\/p>\n

What is phase (and why it's not just an ON\/OFF switch)<\/h2>\n\n \n\n\n\n\n
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Before picking up the soldering iron, we need to understand what the hell this “phase” we're talking about is. It's not a switch, it's not a color. It's a matter of time, movement, and how waves meet. Imagine a sound wave: it has peaks and valleys. When the wave rises, it pushes the air (or the speaker cone) in one direction. When it falls, it pulls it in the other.<\/p>\n

Now, think about your pickups. Each pickup is a kind of magnetic “ear”. When a string vibrates, it moves in the pickup's magnetic field, and this movement induces a small electric current in the pickup's coil. This current has a waveform that “mirrors” the string's vibration. If the string moves upwards, the pickup produces a signal with a positive peak (for example). If it moves downwards, it produces a negative peak.<\/p>\n

There electrical phase<\/strong> of a pickup, in simple terms, describes the polarity of this signal at a given moment relative to another signal. It's not an abstract concept, but it has very concrete effects on the sound. If we take two pickups and make them sound simultaneously, their signals add up. And this is where phase becomes crucial.<\/p>\n

If the two signals are “in phase”, their peaks and valleys coincide. They reinforce each other. The result? A fuller, stronger sound, with more body. That's what normally happens when you use two pickups together in a well-wired and balanced guitar.<\/p>\n

But what happens if the signals are “out of phase”? Imagine that when one pickup produces a positive peak, the other produces a negative peak. When one wave rises, the other falls. What happens when they add up? They cancel each other out! Not completely, not entirely, because the waves are never perfectly identical, but the result is a partial cancellation of common frequencies.<\/p>\n

This phenomenon, called phase cancellation<\/strong>, is why an “out of phase” signal sounds so different. Mid and low frequencies are the first to undergo this cancellation, leaving a much thinner sound, with less punch, sometimes described as “scooped” or “nasal”. It's a very particular effect, not everyone likes it, but in certain musical contexts it can be incredibly expressive.<\/p>\n

To be clear, it's not a defect, it's a characteristic. It's like having two speakers in a cabinet. If you connect them with the correct polarity, they pump air in the same way and the sound is loud. If you connect one in reverse, when one pushes air the other pulls it, and the sound empties. Same thing, but on a small scale and with the electrical waves of your pickups.<\/p>\n

So, when we talk about reversing the phase of a pickup<\/strong>, we are talking about changing the polarity of its electrical signal, so that when it combines with another pickup, its waves meet “in reverse” compared to before. And this, believe me, can radically change the character of your guitar.<\/p>\n

Pickups and polarity: the heart of the problem<\/h2>\n\n
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Well, we understand that phase is a matter of how signals add up. But where does this “phase” in the pickup come from? It's a combination of two main factors: the direction in which the coil is wound and the magnetic polarity of the magnets inside it.<\/p>\n

Every pickup has a copper wire coil. This wire is wound around the magnetic poles. The way the wire is wound (clockwise or counter-clockwise, to simplify) and from which point it starts (the beginning or the end of the winding) determines the electrical polarity of the signal the pickup produces. In practice, each coil has a “beginning” (start) and an “end” (finish).<\/p>\n

Traditionally, one of the two ends of the coil wire is connected to the “hot” of the guitar circuit, and the other to “ground”. If I reverse these two connections, I have inverted the electrical polarity of the signal. Simple, right?<\/p>\n

Then there's magnetic polarity. Pickup magnets have a North pole and a South pole. The vibrating metal string passes through the magnetic field. The interaction between the string's vibration, the magnetic field, and the direction of the coil winding is what generates the electrical signal. If one pickup has a North pole facing the strings and the other has a South pole, this also affects the phase of the induced signal. Fortunately, most pickups, at least traditional ones, are designed to be compatible with each other in terms of magnetic polarity, but this is not always the case.<\/p>\n

The real problem arises when mixing pickups from different manufacturers. There is no universal standard for which wire is “hot” and which is “ground” for each type of pickup. One manufacturer might consider the wire coming from the beginning of the winding as “hot”, another the end. This means that if you take a Seymour Duncan humbucker and a vintage Fender single coil, and connect them following standard colors, you might end up with an unexpected phase inversion when using them together.<\/p>\n

Let's take humbuckers, for example. Many modern humbuckers, especially those with four conductors (plus shielding), offer enormous flexibility. These four wires correspond to the beginning and end of each of the two internal coils of the humbucker. This allows you to do coil splitting (using only one coil), parallel wiring, or, indeed, invert the phase<\/strong> of a coil or the entire pickup.<\/p>\n

If you have a pickup with only two wires (plus shielding, sometimes), typical of single coils or some simpler humbuckers, things are more straightforward: one wire is hot, the other is ground. To invert the phase, you will simply need to swap these two wires. If there is also shielding, that always goes to ground and should not be touched.<\/p>\n

How to identify the wires, if they are not labeled or if you don't have the manufacturer's diagram? The simplest, garage method, is the “tap test”. Connect the pickup to the amplifier (even temporarily, with alligator clips). Touch the pickup poles with a small metal screwdriver. You will hear a “bump” or a “clack” in the amplifier. If you touch the poles with the screwdriver while connecting it to hot and ground in one way, and then reverse the wires and touch again, you will hear that the sound of the “bump” has a different polarity (one will be more “forward”, the other more “backward”). It's not scientifically precise, but it gives you an idea. To be more precise, a multimeter set to AC millivolts, with the guitar connected to the amp and a constant signal (like a metronome or a loop), would allow you to see the peak polarity.<\/p>\n

In any case, the key is to understand that “phase” is a term that describes the relationship between two signals. A single pickup alone does not have an absolute “phase”, it has a polarity relative to a ground. Phase becomes a problem (or an opportunity) when you put two or more pickups together.<\/p>\n

When and why you want to invert the phase (the “strange” sounds)<\/h2>\n

Ok, we've chewed on some theory. Now, let's get to the point: why would we ever want a “scooped” or “thin” sound? The answer is simple: to have more tonal options. The electric guitar is a universe of sounds, and sometimes that “strange” sound is exactly what's needed.<\/p>\n

The sound of two pickups in out of phase<\/strong> is unmistakable: it's scooped in the mid-frequencies, often has a more “quacky” or “nasal” attack, and a slightly lower perceived volume. It's not a sound to use for a powerful, full-bodied riff, but it can be fantastic for funk rhythm parts, particular blues solos, or for adding a different texture to a clean passage. It's a sound that “cuts” well in the mix, without being intrusive.<\/p>\n

A classic example is the sound of Peter Green, the legendary Fleetwood Mac guitarist. It is said that his Les Paul “Greeny” had one of its humbuckers with inverted phase, producing that iconic and somewhat mournful tone, especially in the middle selector position. Brian May of Queen also extensively used out-of-phase pickups on his Red Special, combining them in very complex ways to achieve his wide range of sounds.<\/p>\n

There are several scenarios where you might want to explore phase inversion:<\/p>\n

    \n
  1. Mixing different pickups:<\/strong> As mentioned, if you install a neck pickup from one brand and a bridge pickup from another, you might find that when you use them together, the sound is weak and thin. This is a clear sign that they are out of phase. Inverting the phase of one of them will solve the problem, bringing them “in phase” and giving you a full sound.<\/li>\n
  2. Expanding your sound palette:<\/strong> Even if all your pickups are in phase, adding a phase inversion option for one of them will give you an additional and unique sound. Imagine a Stratocaster: selector positions 2 and 4 (neck+middle and bridge+middle) are already “hum-cancelling” and slightly out of phase with each other due to the magnetic polarity and reverse winding of one of the single coils (usually the middle one). Adding further phase inversion to one of these pickups can lead to even more extreme and “thin” sounds.<\/li>\n
  3. “Funk” and “percussive” sounds:<\/strong> The scooped sound of out-of-phase is perfect for funky rhythms, where the guitar needs to have a defined but not “bulky” presence. It can add a percussive and dry touch.<\/li>\n
  4. Expressive solos:<\/strong> For certain types of blues or jazz solos, a more “vocal” and nasal sound can be very expressive. Out-of-phase can give that somewhat melancholic or gritty character you're looking for.<\/li>\n<\/ol>\n

    Don't expect an absolutely “better” sound. Expect a “different” sound. The goal is not to solve a quality problem, but to add a timbral nuance. It's like having an extra color on your palette. Maybe you won't always use it, but when needed, having it available makes a difference. And in a world where everyone seeks the “perfect” sound, sometimes controlled imperfection is precisely what sets you apart.<\/p>\n

    How to invert the phase: the practical side with switches<\/h2>\n

    Here we are, hands-on. Theory is useful, but in the garage, you act. Inverting the phase of a pickup<\/strong> is an operation that requires a minimum of soldering skills and an understanding of a small component: the DPDT (Double Pole Double Throw) switch.<\/p>\n

    Preparation and Materials<\/h3>\n

    Before you begin, make sure you have everything you need:<\/p>\n