Join Date: Feb 2006
Location: Vancouver, Canada
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If I understand correctly, your customer wants to take a stereo recording, feed it through a pre-amplifier with a mono switch engaged, and then out to a single channel amplifier / speaker. What is going to happen is the electrical summing of frequencies as the L and R channels are mushed together.
For example, if the original stereo signal at 1000 Hz the L channel has an output voltage of +0.25 volts and the R channel has an output voltage of -0.50 volts, then the mono signal sent to the power amplifier will be just -0.25 volts. There will be a loss of detail in the sound as the voltages are combined and the sound will be quieter.
At another moment the signals might be +0.25 and +0.50 for L and R channels. The combined signal would then be +0.75 volts and the sound reproduced will be louder.
I'd presume that the mono switch, when used with a stereo recording, would exaggerate the dynamic range of the original recording. Some passages become too quiet and some become too loud. But you may not necessarily notice the difference. I'd suggest giving it a try and if the sound is pleasing then enjoy it for what it is.