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MEGS® outputs of Non Linear stages in MFX units

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Here we study the graphs that MEGS® outputs for Non Linear stages of Amplifier Models


Above is the first graph that we present from our "Model Emulation Graphics System ®" , lovingly called MEGS® by our engineers. It shows the main Non-Linear transfer section for the DIGCLEAN amplifier factory setting.
You can see that the transfer function is very linear for the most. It therefore does not distort the signal for small signals.
For much larger signals, we see that transfer function drops off a bit. This will introduce a very soft clipping and slight compression for signals in that region.
We notice that the graph is symmetrical. This means that only odd harmonics will be created by this transfer function.
The natural gain implemented by this function is rather low. For input signals of 0.5 units, we output about 0.75 units ie a gain of 1.5
Such a linear transfer curve is usually found in Amplifiers used for Country, Classical, Pop, Acoustic work.


Now lets look at the transfer function of the DIGCRNCH factory setting shown above.
For small signals, the graph is quite linear around the zero point. The gain is higher than the model above. For an input signal of 0.25 units, we need an output of 0.75 units ie a gain of 3.
But things get interesting for signals above 0.25 units. We can see that the signal is soft clipped for positive excursions and hard clipped for negative excursions. This transfer function will be quite tube like as it is asymmetric and relatively smooth ( but crunchier than a tube as it clips harder for negative swings). It will show good dynamics and respond well to pick dynamics and the guitar's volume control.
Such a Transfer function ( like a tube amp) can be useful for the Blues, 1950's Rock and Roll and Pop when slightly overdriven. You can also attain modern 1980-1990's Rock and Roll sounds by driving this Transfer Function deeper into saturation.


Above is the graph for the MRSHMSTR Amplifier model. It implements the standard transfer response of a Tube amplifier.
It is very similar to the DIGCRNCH model. OK, the gain is a bit lower at 2 and is a bit less crunchy ( More linear) , but the similar overall shape predicts that this transfer function will perform very similarly to DIGCRNCH !!


Above is the Non-Linear transfer function of the DIGMETAL. It has a high gain around 8 for small signals. However input signals above 0.2 units are hard clipped on the output. This predicts fuzzy sounds and long sustains for single notes. The very high intermodulation distortion of such a high clipping means mayhem for chords !!!
The clipping characteristics are asymmetrical.
As the Model name implies, this type of Transfer curve is suitable for Metal, Hard Rock, Classic Rock.


Talk about chosing a model name appropriately !!. The above is the MEGS® output for the DIGIGAIN model. You can see that it has a very high gain of around 10 for small signals and very rapidly reaches the maximum output possible with even small input signals. This graphs shows no consideration to pick dynamics of even guitar volume. You touch a  string and the output immediately maxes out. This is high gain territory and noise, hiss, hum and intermodulation distortion come along with the territory !!
High Gain transfer functions are suitable for Metal, Nu-Metal, Hard Rock and Roll
And below, you see the MEGS® outputs of various other Amplifier models. Try and use the comments on the models above to predict how the models below will react !!





Look at the 2101 graph above and see if you can answer some questions.
  • Is this a high gain or a low gain model ?
  • Would this kind of a transfer function be suitable for rock, blues or metal ?
  • Would this Amplifier model respond to pick dynamics ?
  • Which amplifier model above is most similar to the 2101 ?

Do you have any questions on the information presented above ? 
As an understanding of Non Linear Transfer functions is vital to understand Amplifier response, we would be pleased to assist with clarifications. Drop us a line !!

TonsOfTones at gmail dot com
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