Where there is shouting, there is no true knowledge.

Volume tends to rise as certainty runs out. People who know what they are talking about can afford to be quiet, to concede a point, to admit they are unsure of one part, because the case does not depend on force of delivery. Shouting is what an argument does once it has stopped being an argument.

Use that as a signal in both directions. When a room gets loud, look for what nobody in it can actually substantiate. And when you notice your own voice climbing, treat it as a prompt to check whether you have the evidence or only the position.