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Old 24th March 2010, 11:26 AM   #1
pinobot is offline pinobot  Netherlands
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Default Proper way to get mono?

Is there a right way to play a stereo signal over one speaker?
Is there any hardware that does this?
I can imagine that simply summing the signals doesn't lead to a very accurate reproduction or does it?
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Old 24th March 2010, 01:12 PM   #2
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Summing the signals is the right way. Do it at the input, not the output!

Quick and dirty method is just to use 2 resistors - about 10K should do it.

Proper way is with a summing amplifier, as linked below - use a value between about 1K and 10K for all the resistors.

Op Amp Summing Amplifier
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Old 24th March 2010, 03:16 PM   #3
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Or see this Rane Corp. paper:

Why Not Wye?
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Old 25th March 2010, 02:38 AM   #4
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The problem with simply hooking left and right together is this, the left channel is left plus mono and the right channel is right plus mono. Adding these directly gives left+mono+mono+right so there are two monos and a left and a right. The result of this is not really what is wanted because if the L and R have any time difference of a particular signal there will be a lot of loss in higher frequencies. The attached file is the way I like to make mono but it is a little over the top for most people. This is made with two all pass filter strings and sounds really good.
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File Type: jpg MONO.jpg (51.9 KB, 74 views)
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