A universal 2,400-metre range is a poor description of modern sonar. Some compact civilian pulse-sonar systems used for seabed mapping may fit that figure, but the small vessels that carry them and their processing capacity are not comparable to a nuclear attack submarine. Detection performance depends on the array's size and sensitivity as well as the computing power available to interpret its returns. Isolated range figures therefore say little about military sonar capability, while the scale of the sensor and its processing load helps explain why sensors can dominate a warship's electrical demand.
Notable Point · 2:41-3:52
Why a quoted sonar range can mislead
A short technical aside contrasts compact civilian seabed-mapping sonar with the computing power, sensitivity, and array scale available to a nuclear attack submarine.