I've got a question, hopefully someone knows the answer. What's the difference between a Q2A and a Q2B siren? besides the lettering
Why i'm asking this is because we have 2 engines that have Q's. One is a Q2A and the other is a Q2B. I don't notice a difference in sound.

Why i'm asking this is because we have 2 engines that have Q's. One is a Q2A and the other is a Q2B. I don't notice a difference in sound.
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