How guitar amp, stompbox and cabinet simulators affect the harmonics of a tone

 

Hello everyone and welcome to this week's article!

Today's topic has been suggested me by my friend Carlo from Ignite Amps, and it involves using a spectrum analysis tool to see the changes that occur in our tone with the various types of plugin that can be used in our guitar chain.

The first picture, the one on top, is a sine wave generated from Presonus Studio One, the most neutral sound I could come up with, and in this second image we can see what happens if we pass it through an overdrive (the Ignite Tyrant Screamer, the settings of all the plugins are at noon): you can see the solid state style distortion produced, which creates harmonics in a regular, repetitive way.

In this third picture we see our sine wave passing through a tube power amp simulator (the Ignite TPA-1), notice that the harmonic increase is not as dramatic as per the overdrive, but this addition makes the tone warmer and fuller thanks to the tube emulation.

In the fourth picture, the one below, you can see what happens if we pass our sine wave through a preamp, the Ignite NRR-1; here we can see a more noticeable change, especially in the high end.

In this fourth picture you can see the result of summing up the overdrive, the preamp and the power amp: the harmonics add up, and if you look closely for example you can see graphically the overdrive ones and the preamp ones.

Finally one of the most important steps, which once again changes dramatically the tone: the cabinet simulator (in this case Lancaster Audio Pulse, using its stock IR):  the change is significant, because the IR applies its own EQ curve, in this case lowering the high end and gives the tone its final touch in order to sound realistic.

Obviously I have used a sine wave because it's easier to show graphically, if you will repeat this experiment using your guitar tone it will look different, but I have made this article to focus on two things: the importance of a power amp, compared to when someone puts a virtual preamp directly into a cabinet simulator, and to show how drastic are the changes performed by the cabinet simulator.

I hope this helps!

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