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What is True Stereo versus Pseudo-stereo?

By Sweetwater on August 17, 2016

What is True Stereo versus Pseudo-stereo?

In terms of effects and processors, there are a number of terms that can apply to the “stereo-ness” of the signal. Consider these definitions:

True Stereo — The stereo signal consists of two related channels, with correlated material in the left and right outputs. For example, using two microphones spaced apart to capture a signal.
Pseudo-stereo (aka “simulated stereo:) — One of several different techniques for creating a two-channel output from a mono input, often utilizing processing for one channel and no processing on the other channel, including adding a slight delay to one side, adding chorus to one side, etc. For example, mixing a mono guitar amp to two channels with the left side dry (no effects) and the right side processed with a very short delay (a few milliseconds).

One is not necessarily better than the other. In fact, depending on the effect, Pseudo-stereo can result in a “wider” stereo field than true stereo.

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