What the hell, they are not equal at all. Overall the Soviet boats are louder until the the Victor II and Victor III which incorporate rafting, as per history. The diesel boats are quiter because we assume they are running their electric engines. The only noisy US boat is the Skipjack, and even then it is far quieter than any of the boats the Soviets have in the 68 campaign. All of the US boats have better sensors in the game than their Soviet counterparts.
So quieter US subs + louder Soviet subs = large US advantage as per history. On average you are going to have at least a 10db advantage against nuke boats until you face Victor III's and Sierras, which are not that common.
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