Mono VS Stereo Jacks, Are You Missing Out?

Here's something we're often asked about when it comes to guitar electronics. On the subject of guitar jacks, which one is better? What are their uses, and is there a difference in sound?

We'll quickly go over a few key differences for you to settle it once and for all. For those that want to go a bit more in depth, we'll also include some of the technicalities involved & how to wire each one.

Types of Guitar Jacks:
First of all, the two most common guitar jacks used in guitar builds are of course, MONO & STEREO.
You can visually tell them apart by simply counting the number of prongs/leads each one has.

A mono jack will have 2 prongs, 1 is a ground wire, and the other is the power/live wire used to power you pickups.
A stereo jack on the other hand, will have 3 prongs. The configurations is the same as above with the addition of an auxiliary prong that can be used for power switching.

In relation to most built guitars, Mono jacks are the standard required for the guitar to operate. The only exception is for guitars with active guitar pickups, or additional electronics like pre-amps. This is where the additional prong of the stereo jack comes in handy as it acts like an on/off switch.

It's because of the stereo jack's switching capability that we offer them as an add-on to our guitar kill switches. In this application, the stereo jack controls an LED by turning it on when the guitar cable is plugged in, and turning the light off when removed.

So that's the difference & their general uses, but which one is better, and should you upgrade to a stereo jack if you've got a mono installed?

Well it all comes down to application really. You are not likely to find a distinct difference in feel or sound using one or the other. The one thing is that a stereo jack will do everything a mono jack can do but not the other way around. If you plan on adding active pickups or perhaps an LED killswitch, then swapping over to a stereo jack will make it all worth it.

Additional notes:
Your most common mono/stereo jacks available are what's considered a "skeleton" style. There are however some guitars that feature what's called a "barrel" styled jack & although they look very different, they have the same functionality & wiring.

A third type of jack
which is less common in guitar applications is what called a "switched jack". These guitar jacks actually have 4 prongs allowing even greater versatility when it comes to wiring auxiliary electronics. An instance where you would use these is if you had a guitar with piezo pickups in conjunction with regular pups, and you wanted to send 1 signal to the amp, and the other signal to a mixer or another amp.

Wiring The Various Guitar Jacks

When it comes to wiring each jack, their components must also be taken into account. They are generally identified as TRS, or Tip/Ring/Sleeve on both the jack & the plug connectors.

A mono jack will only have a Tip & Sleeve section, while a stereo jack will have the additional Ring component. The same can be found on a plug connector where a mono will have a single marking, while a stereo has two.

Mono jack installation

These process for wiring these is the most simple. Having only 2 prongs, it's pretty hard to get the two mixed up. The "Sleeve" or ground will be the prong touching the center where the plug is inserted, the "Tip" portion will be the remaining prong. Obviously if you get no sound the first time, all you've got to do is swap the wires and you should be back on track. Take your time identifying each component as you'll be sure to get it all right the first time.

Stereo jack installation

For this type of jack, just set it or visualize it in this position. You'll find the center prong to be the "Sleeve/Ground", and the "Tip" or live/hot wire on the right hand side. The remaining prong on the left; the "Ring" will be the auxiliary prong which can be used for power switching.

The switching mechanism is activated by inserting the plug connector in to form a sort of bridge. This bridge connects the Ring & Sleeve together forming a loop and allowing the power to pass through. Disconnect the plug & the gap is created between the two which cuts the power.

Barrel Type Jacks

Mono:

Stereo:

Switching Jack Installation

Last but not least are the "Switching" barrel guitar jacks with a total of 4 prongs. These are a rare find but here's a diagram if ever run into one.

Final words

I hope that cover any questions you might have regarding a sometimes confusing but essential topic of guitar jacks. If you have any other questions or concerns, feel free to comment below.

Thanks for reading guys

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