This article was written in reference to the 302, but the concept of polarity reversal applies to all Sound Devices products which provide polarity reversal on certain channels.

Q: What does the polarity switch on a 302 do? Sometimes when I switch it I lose signal on channel 2. What is going on?

A: The Polarity Reverse Switch on a 302 mixer reverses the polarity of channel 2 with respect to channels 1 and 3 when engaged. This is useful for flipping the stereo image of MS Stereo signals.

This is a two position switch, either on or off. Be certain that the switch is fully pushed to the top or bottom positions, as leaving it in the middle will prevent signal from passing on channel 2.

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